Mastering Mil-Spec Dowel Pins: Fit, Material, and Series Made Simple

What Makes Mil-Spec Dowel Pins Different?

Mil-Spec (Military Standard) dowel pins are precision-ground, solid headless fasteners engineered for exact alignment, location, and secure assembly of components in aerospace, defense, and precision manufacturing.

They are produced under strict Mil-Spec specifications to ensure dimensional accuracy, repeatability, and conformance. Unlike commercial pins, Mil-Spec versions must be tested and certified for mechanical properties, hardness, and finish supported by documentation packages that may include Material Test Reports (MTRs), Certificates of Conformance (COCs), Heat Treat Certifications and DFARs compliance statements.

Dowel pins are commonly used as hinges, shafts, pivots, or locating devices to align or secure parts within precision assemblies or fixtures.

Four Common Mil-Spec Dowel Pin Series

Not all dowel pins are created equal. Each Mil-Spec series follows strict guidelines for fit, tolerance, material and other attributes to ensure accuracy and repeatability in demanding applications. Whether double-chamfered or featuring a radius and chamfer combination, these pins play a vital role in precision alignment. Below we deconstruct the taxonomy and attributes of the four series most frequently used in military and aerospace manufacturing.

1 – MS16555 — Standard Headless Dowel Pin (Press Fit)

Equivalent: Similar to ASME B18.8.2 standard series

Design: Straight, solid headless dowel pin normally made with a chamfered crown on one end and a chamfer on the other
Fit Type: Provides a standard interference/press fit
Tolerance: -0 / +0.0002 over nominal size
Material Options:
- MS16555-1 to -145: Steel (Carbon or Alloy), hardened
- MS16555-301 to -444: Phosphate-coated Steel, hardened
- MS16555-601 to -744: CRES 410/416 Stainless Steel, hardened and passivated
Diameter Range: 1/16″ (.0626–.0628) to 1″ (1.0001–1.0003)
Length Range: 3/16″ to 6″ (lengths over 3″ may be limited)
Applications: Ideal for vibration-resistant, high-strength alignment in aircraft and defense assemblies

➡️ Available for purchase online or RFQ

2 – MS16556 — Oversize Headless Dowel Pin (Extended Length / Oversize Fit)

Equivalent: Similar to ASME B18.8.2 oversize standard series

Design: Straight, solid headless dowel pin normally made with a chamfered crown on one end and a chamfer on the other (Similar to MS16555 with oversize tolerance)
Fit: Oversize interference fit
Tolerance: -0 / +0.001 over nominal diameter
Material Options:
- MS16556-1 to -144: Steel (Carbon or Alloy), hardened
- MS16556-301 to -444: Phosphate-coated Steel, hardened
- MS16556-601 to -744: Stainless Steel, hardened and passivated
- MS16556-801 to -944: Cadmium-plated Steel, hardened
Diameter Range: 1/16″ to 1″
Length Range: 3/16″ to 6″ (extended per spec; over 3″ limited)
Applications: Ideal for worn holes and to replace pins that no longer fit securely.

➡️ Now available for RFQ at mfsupply.com

MIL-P-21143 Series

3 – M21143/1 — CRES 303 Stainless Steel Dowel Pin (Press Fit)

Specification: MIL-P-21143

Design: Straight, headless pin with .015/.010 x 45° chamfer on both ends
Fit: Press fit — standard interference fit (referred to as “Oversize” in spec)
Tolerance: -0 / +0.0002 over nominal
Material: CRES 303 Stainless Steel
Diameter Range: 1/16″ to 1″
Applications: Used to join moving components or in high-precision assemblies requiring corrosion resistance and tight alignment

➡️ Available for RFQ at mfsupply.com

4 – M21143/2 — CRES 303 Stainless Steel Dowel Pin (Slip Fit / Undersize)

Design: Produced similar to M21143/1, straight, headless dowel pin with precision-ground surfaces, generally produces with a .015/.010 x 45° chamfer both ends
Fit: Slip fit — slightly undersized for easy removal or adjustment
Tolerance: +0 / -0.0002 under nominal diameter
Material: CRES 303 Stainless Steel.
Applications: Used in assemblies requiring frequent disassembly or maintenance; ideal for prototypes or variable-fit applications

➡️ Available for RFQ at mfsupply.com

Choosing the Right Material

Material	Key Traits	Common Uses
Alloy/Carbon Steel (Plain, Cadmium, Phosphate)	High strength, durable	Heavy-load or high-temp applications
CRES 410/416 Stainless Steel	Hardened, corrosion-resistant	Aerospace and defense
CRES 303 Stainless Steel	Corrosion-resistant, easy to machine	Slip-fit and/or precision alignment

All Mil-Spec dowel pins from MF Supply include Manufacturer’s Certificates of Conformance. Full certification packages — MTRs, Dimensional Reports, Heat-Treat, Passivation, and DFARS statements — are available upon request and may incur a fee.

👉 Checkout our Mil-Spec Precision Dowel Pins Cross-Reference Charts

Checklist: Sourcing the Correct Mil-Spec Dowel Pin

Before placing your RFQ or order, confirm:

Specification / Part Number – e.g., MS16555, MS16556, M21143/1, M21143/2. Check the diameter, length, tolerance, material and all specs to the Mil-Spec print.
Material & Finish – Match environment and strength needs.
Fit / Tolerance – Choose standard press fit, oversize, or slip fit as required.
Documentation – Determine your paperwork requirements at every stage of the process from initial RFQ to receiving inspection to insure audit readiness.

Mil-Spec Dowel Pins from MF Supply

MF Supply is your WBE/WOSB-certified U.S. distributor for certified, commercial, and custom dowel pins, including:

MS16555, MS16556, M21143/1, and M21143/2 series
Alloy and CRES Stainless Steel options
Certification packages (MTRs, COCs, Passivation, DFARS, Heat-Treat)
Fast RFQ turnaround and domestic stock for quick delivery
Made to order option for parts that are not COTs or for special sizes, materials and tolerances

We’re proud to announce that MS16556 dowel pins are now available for RFQ — joining our comprehensive Mil-Spec, metric, and precision dowel pin lineup.

👉 Visit MF Supply to request a quote or browse our catalog.

We are your Purchasing Department’s Secret Weapon for Mil-Spec hardware!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Your Purchasing Department’s Secret Weapon!
Here are 5 reasons to buy from MF Supply

We Source and Deliver What Others Can’t, Faster Than You Imagined – With speedy solutions for elusive parts and lengthy delivery times – We’ve got you covered with both custom-made specials (send us your prints!) and hard-to-source options, quickly and at a fair price.
Cost-Effective Functional Equivalents to OEM Brand Fasteners-Why Pay More? – Reduce lead times and costs with the same quality and same performance. Try us for alternatives to brands like McMaster-Carr, MSC, Misumi, PEM, and RAF and experience unmatched savings! Same form, fit and function for less.
Huge Selection of Certified and Commercial Hardware with Same-day Shipping Available for Countless Items – We source and stock standards, specials, commercial, Mil-Spec & OEM brands in inch and metric sizes. Standards include AN, NAS, MS, IFI, ASTM, ASME, DIN, ISO, JIS. We are sourcing experts for inserts, certified Mil-Spec parts and anything in stainless steel. Many parts are available with manufacturers’ certifications, including DFAR, ROHS and CoC. Trust us to ship on-time from our national distribution centers.
A User-Friendly, 24/7 Online Shopping Experience – Enjoy a 24/7 online shopping experience with easy-to-use filters, detailed product information, and a constantly updated technical directory. Sign up now for a seamless experience!
WBE/WOSB Certified Woman-Owned Small Business – As a certified Woman-Owned Small Business, we support your diversity goals. Trust us to meet your fastener and sourcing needs with expertise and efficiency [Cage Code 58QG4].

MF Supply is a WBE/WOSB certified supply chain partner to business, industry and government. We are sourcing experts and stocking distributors of Hardware, Precision & Mil-Spec Fasteners and Safety supplies. For more than 50 years, we have been supplying manufacturers in the electronics, industrial, commercial, aerospace and military markets with the full range of fastener products and services. Our Cage Code is 58QG4 and our registered name is RL Supply Inc dba MF Supply.

Mil-Spec Socket Cap Screws: A Complete Buyer’s Guide

Posted: September 22, 2025 | Author: mfsupplyblog | Filed under: Mil-Spec, Mil-Spec Fasteners, MS16995, MS16996, MS16997, MS16998, MS24671, NAS1351, NAS1352, Socket Head Cap Screw | Tags: Fasteners, Guide, Mil-spec fasteners, Mil-Spec Fasteners Distributor, Mil-Spec Fasteners Supplier, Mil-Spec Socket Head Cap Screws, Military Fasteners, Military Fasteners Supplier, MS16995, MS16996, MS16997, MS16998, MS24671, NAS1351, NAS1352, Socket Cap Screws | Leave a comment

When it comes to aerospace, defense, and mission-critical industrial applications, not all socket cap screws are created equal. While commercial socket cap screws can be sufficient for general manufacturing, Mil-Spec socket cap screws are engineered, tested, and certified to meet the stringent requirements of the U.S. military and defense supply chain.

In this guide, we’ll cover:

The variations of Mil-Spec socket cap screws
Materials, platings, and optional features
The part number taxonomy (MS, NAS, NASM, AN designations)
How Mil-Spec differs from commercial socket caps
Typical applications and industries
MF Supply’s Mil-Spec socket cap screw catalog offerings

Variations of Mil-Spec Socket Cap Screws

Mil-Spec socket cap screws (sometimes called MS or NAS socket head cap screws) come in multiple variations to meet specific performance requirements: The 2 main Mil-Spec standards are:

Standard socket head cap screws – Cylindrical head, hexagonal drive. Designed for high-strength fastening where space is limited.
Flat socket cap screws – Used in clearance-sensitive applications where flush mounting is critical.

Note: Low Head and Button Head socket cap screws do not have a Mil-Spec equivalent.

Mil-Spec socket head cap screws come in several varieties, including:

Drilled heads (safety wire holes) – Feature cross-drilled holes in the head to allow safety wiring, preventing loosening in high-vibration environments like aircraft engines.
Thread-locking (pre-applied patch) – Includes a nylon or chemical locking element on the threads, providing resistance to vibration loosening.
Vent/drilled-through screws – Designed to eliminate trapped gas or contamination in vacuum or cleanroom environments.

Note: Varieties including threadlocking, drilled heads and vented options are less common and may only be available per special order with minimums and lead times.

Materials & Platings

Mil-Spec socket cap screws are offered in specific materials and platings with mechanical properties that meet or exceed ASTM/SAE standards. Common options include:

Alloy Steel – High tensile strength, black oxide or cadmium plated for corrosion resistance
CRES Stainless Steel (18-8/300 series stainless steel) – Corrosion resistance, often used in aerospace and marine environments
CRES A286 Stainless Steel superalloy – Extreme temperature resistance, high strength and with excellent corrosion & oxidation resistance

Note: SS316 stainless steel is less common and may only be available by special order with minimums and lead times.

Platings and Coatings:

Black Oxide (MIL-C-13924, Class 1) – Standard corrosion resistance
Cadmium Plating (QQ-P-416) – Excellent corrosion resistance and lubricity. Widely specified in legacy Mil-Spec standards.
Passivation (for stainless steels, QQ-P-35) – Removes surface contaminants and improves corrosion resistance.

Part Number Taxonomy

Military grade fasteners or “Mil-Spec” fasteners are usually designated by an AN, MS, NAS or NASM prefix followed by a part number.  Each of these prefixes is an abbreviation: NAS stands for National Aerospace Standard and MS stands for Military Standard. 

The Defense Supply Center Philadelphia (DSCP), part of the DLA (Defense Logistics Agency), has a Qualified Suppliers List for Manufacturers (QSLM) identifying pre-qualified sources for certain products purchased by DSCP. Referred to also as the QPL (Qualified Products List), manufacturers on this list are recognized by DSCP as meeting all necessary criteria, particularly regarding quality control and paperwork.

Each part number defines key parameters: head style, material, finish, thread class, and whether features like drilled heads or locking elements are included.

The main core part numbers identifying standard Mil-Spec socket head cap screws are MS16995, MS16996, MS16997, MS16998, NAS1351, and NAS1352. Flat head socket head cap screws fall under parts MS24671 and MS24672.

MS (Military Standard) – Legacy part numbers (e.g., MS16995), still widely used in aerospace and defense
NAS (National Aerospace Standards) – High-performance standards developed for aerospace (e.g., NAS1351, NAS1352)
NASM – Updated versions of NAS standards under SAE governance
AN (Army-Navy) – Older standards, often superseded by MS or NAS numbers

The base part is followed by a Material Code:

“-” = Alloy Steel
“C” = Corrosion Resistance Steel (18-8 stainless steel)
“N” = Heat-Resistant Steel (A286)
Let’s further break down a common Mil-Spec socket cap:
For example: NAS1352N028, sometimes written as NAS1352N02-8
2-56 X 1/2 Mil-Spec Socket Head Cap Screw A286 Stainless Steel DFAR
NAS1352 = Coarse thread Socket Head cap screw
N = Heat-Resistant Steel (A286)
02 = 2-56 Diameter
8 = .500 or 1/2 screw length

Note: The Aerospace Industries Association maintains an updated list of NAS parts available to members and/or for purchase.

Why Mil-Spec Socket Caps Are Different from Commercial

Commercial socket caps may look identical to Mil-Spec socket caps. However, commercial fasteners may lack the controlled processes, documentation, and certifications required for military or aerospace projects.

Differences between Mil-Spec and commercial socket head cap screws may include:

1. Certification & Paperwork

Available Paperwork may include:

Manufacturer’s Certificate of Conformance (C of C)
Lot and heat traceability
Dimensional testing
Material Test Reports (MTRs)
DFARS compliance certification for defense projects

2. Testing

Mil-Spec socket caps undergo rigorous mechanical, dimensional, and sometimes nondestructive testing to verify hardness, tensile strength, shear strength, plating thickness, and more.

3. Authorized Manufacturers

Manufacturers listed on the QPL (Qualified Products List), the Qualified Suppliers List for Manufacturers (QSLM), or those approved under aerospace quality systems (AS9100, NADCAP for plating, etc.) are authorized to produce Mil-Spec socket caps. This ensures supply chain integrity and reliability in defense applications.

Applications

Mil-Spec socket head cap screws are commonly used in:

Aerospace & Defense – Aircraft structures, engines, avionics, and ground support equipment
Military Vehicles & Marine – Tanks, ships, submarines, and defense electronics

Other industries use Mil-Spec fasteners because of their quality and traceability. Two examples include Precision Manufacturing where vibration, temperature extremes, or strict compliance require certified fasteners, and Medical & High-Tech Industries where cleanrooms, vacuums, or corrosive environments require traceability is essential.

MF Supply’s Mil-Spec Socket Cap Offerings

At MF Supply, we stock and source a broad catalog of Mil-Spec socket head cap screws including:

NAS1351 & NAS1352
MS16995, MS16996, MS16997, MS16998
MS24671 & MS24672
Variants with drilled heads, vent holes, and locking elements
Multiple materials, platings, and DFARS-compliant options

We partner with only qualified U.S. and global manufacturers and provide full certification packages upon request.

Beyond strength and performance, the real differentiators are the certifications, testing, and compliance requirements that ensure supply chain integrity.

MF Supply has over 50 years of experience supplying Mil-Spec, DFARS-compliant, and certified hardware. Whether you need a handful of parts or long-term stocking solutions, we’re Your Purchasing Department’s Secret Weapon.

👉 Explore Our Catalog of Mil-Spec Socket Cap Screws or Request a Quote today.

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Your Purchasing Department’s Secret Weapon!
Here are 5 reasons to buy from MF Supply

We Source and Deliver What Others Can’t, Faster Than You Imagined – With speedy solutions for elusive parts and lengthy delivery times – We’ve got you covered with both custom-made specials (send us your prints!) and hard-to-source options, quickly and at a fair price.
Cost-Effective Functional Equivalents to OEM Brand Fasteners-Why Pay More? – Reduce lead times and costs with the same quality and same performance. Try us for alternatives to brands like McMaster-Carr, MSC, Misumi, PEM, and RAF and experience unmatched savings! Same form, fit and function for less.
Huge Selection of Certified and Commercial Hardware with Same-day Shipping Available for Countless Items – We source and stock standards, specials, commercial, Mil-Spec & OEM brands in inch and metric sizes. Standards include AN, NAS, MS, IFI, ASTM, ASME, DIN, ISO, JIS. We are sourcing experts for inserts, certified Mil-Spec parts and anything in stainless steel. Many parts are available with manufacturers’ certifications, including DFAR, ROHS and CoC. Trust us to ship on-time from our national distribution centers.
A User-Friendly, 24/7 Online Shopping Experience – Enjoy a 24/7 online shopping experience with easy-to-use filters, detailed product information, and a constantly updated technical directory. Sign up now for a seamless experience!
WBE/WOSB Certified Woman-Owned Small Business – As a certified Woman-Owned Small Business, we support your diversity goals. Trust us to meet your fastener and sourcing needs with expertise and efficiency [Cage Code 58QG4].

MF Supply Recertified as a Small Woman-Owned Business Enterprise!

Posted: January 22, 2025 | Author: mfsupplyblog | Filed under: Custom Fasteners per print, Domestic Fasteners, Electronic Hardware, Fasteners, Mil-Spec Fasteners, Panel Fasteners, Supply chain - manufacturing | Tags: Certifications, Fasteners, Fasteners Distributor, Fasteners Supplier, Hardware, Inclusion & Diversity, MF Supply Recertified, Mil-spec fasteners, Military Fasteners, SBE, Small Business Enterprise, Supply Chain Partner, WBE, Women Owned Business | Leave a comment

MF Supply, a leading distributor of fasteners and hardware, is proud to announce that we have successfully been recertified as a Women’s Business Enterprise (WBE) and Small Business Enterprise (SBE) by the state of New Jersey. This certification reaffirms MF Supply’s commitment to providing high-quality products while fostering diversity and inclusion in the manufacturing and distribution sectors.

How Does This Benefits You

Meet Your Diversity Goals: As a certified WBE and SBE supplier, we can help your business fulfill inclusion and diversity requirements while ensuring top-tier service and reliability.
Hard-to-Find Parts? Solved! From mil-spec fasteners to custom hardware, we specialize in sourcing hard-to-find components like Keensert® style key-locking inserts, helical inserts, dowel pins, socket head cap screws and more—all with precision and speed.
Decades of Expertise: Partner with a team that understands your needs. Whether it’s aerospace engineering, manufacturing, or government projects, we act as an extension of your purchasing departments providing lightning-fast responses, direct support, and competitive pricing.

Why Choose MF Supply?

With 50 years of fastener experience, we offer lightning-fast responses, direct phone support, free samples, and act as an extension of your team. We are fastener & sourcing experts, so you don’t have to be. With vast experience as a leading supplier and distributor of commercial and Mil-Spec fasteners, both in inch and metric sizes, we excel in providing:

A vast inventory of certified and commercial hardware with same-day shipping available.
Cost-effective solutions for OEM brand equivalents like McMaster-Carr, PEM, and RAF.
24/7 online shopping with a user-friendly experience at www.mfsupply.com.

Featured Products:

Some of our featured product lines include:

Manufacturers working with us can expect timely deliveries, competitive pricing, and access to expert guidance to help optimize their fastener choices. Visit our website, Connect with our team or send us a request for quote and our team of sourcing experts will help you find what you need. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Your Purchasing Department’s Secret Weapon!
Here are 5 reasons to buy from MF Supply

We Source and Deliver What Others Can’t, Faster Than You Imagined – With speedy solutions for elusive parts and lengthy delivery times – We’ve got you covered with both custom-made specials (send us your prints!) and hard-to-source options, quickly and at a fair price.
Cost-Effective Functional Equivalents to OEM Brand Fasteners-Why Pay More? – Reduce lead times and costs with the same quality and same performance. Try us for alternatives to brands like McMaster-Carr, MSC, Misumi, PEM, and RAF and experience unmatched savings! Same form, fit and function for less.
Huge Selection of Certified and Commercial Hardware with Same-day Shipping Available for Countless Items – We source and stock standards, specials, commercial, Mil-Spec & OEM brands in inch and metric sizes. Standards include AN, NAS, MS, IFI, ASTM, ASME, DIN, ISO, JIS. We are sourcing experts for inserts, certified Mil-Spec parts and anything in stainless steel. Many parts are available with manufacturers’ certifications, including DFAR, ROHS and CoC. Trust us to ship on-time from our national distribution centers.
A User-Friendly, 24/7 Online Shopping Experience – Enjoy a 24/7 online shopping experience with easy-to-use filters, detailed product information, and a constantly updated technical directory. Sign up now for a seamless experience!
WBE/WOSB Certified Woman-Owned Small Business – As a certified Woman-Owned Small Business, we support your diversity goals. Trust us to meet your fastener and sourcing needs with expertise and efficiency [Cage Code 58QG4].

Mil-Spec Fasteners in Stock at MF Supply

Posted: November 27, 2024 | Author: mfsupplyblog | Filed under: Mil-Spec, Mil-Spec Electronic Hardware, Mil-Spec Fasteners | Tags: Fasteners, Hardware, Mil-spec fasteners, Mil-Spec Fasteners Distributor, Mil-Spec Fasteners Supplier, Mil-Spec Helical Inserts, Mil-Spec Hex Head Cap Screws, mil-spec keenserts, Mil-Spec Self-Tapping Screws, Mil-Spec Set Screws, Mil-Spec Socket Head Cap Screws, Military Electronic Hardware Supplier, Military Fasteners, Military Fasteners Supplier, supply chain | Leave a comment

Are you searching for certified Mil-Spec fasteners to meet your bill of requirements (BOM) or project specifications? Look no further! MF Supply specializes in sourcing and supplying domestically manufactured AN, MS, and NAS Mil-Spec fasteners for aerospace, defense, and industrial applications. MF Supply stocks over 3,000 unique certified parts from the Qualified Suppliers List for Manufacturers & Distributors (QSLM & QSLD). Mil-Spec products stocked include Keensert® Style Key-Locking Inserts, Helical (HeliCoil®) Inserts, Precision Dowel Pins, Slotted Spring Pins, Extended Prong Cotter Pins, Nuts, Washers, Machine Screws, Precision Shoulder Screws, Hex Head Cap Screws/Bolts, Socket Head Cap Screws, Set Screws, Self-Tapping Screws and more. All Mil-Spec parts undergo rigorous testing and are DFARS or domestically manufactured with Certificate of Conformance (COC) and Material and Physical certification paperwork available to ensure compliance.

Buy Mil-Spec Fasteners and Precision Electronic Hardware at MF Supply!

We Have All the Mil-Spec Fasteners and Precision Hardware You Need

We offer a huge selection of DFARS certified and domestic Mil-Spec fasteners directly on our website, making it easier for you to find exactly what you need for your project at the click of a button or via RFQ depending on your preferred method of procurement. Below is a list of some of our most popular Mil-Spec product categories available:

1 – Mil-Spec Keensert® Style Key-Locking Inserts

Standards: MS51830, MS51831, MS51832, NA0146, NA0147, NA0148, NA0149, NA0150, NA0151, and NAS1395.
Styles: Miniature, Thin Wall, Heavy Duty, Thick Wall, and Extra Heavy Duty
Available Sizes: 2-56 to 1/2-13 Internal thread for inch sizes and M2 x 0.4 to M24 x 2 for metric sizes
Materials: 4140 alloy steel, Nitronic 60, CRES A286 and 303 series stainless steel
Applications: Can be used to create new threads, for thread reinforcement, and to repair stripped threads

2 – Helical Inserts (aka HeliCoil®)

Standards: MS121, MS122, MS124, MS21209, MA3279, and MA3329
Styles: Free-running and self-locking
Available Sizes: #2-56 to 1½-6 for inch sizes and M2 to M36 for metric sizes
Materials: CRES 300/18-8 stainless steel
Applications: Can also be used to create new threads, for thread reinforcement, to convert threads between inch and metric sizes, and to repair stripped threads

3 – Mil-Spec Precision Dowel Pins

Standards: MS16555, MS16556, and MIL-P-21143
Styles: Interference/Press Fit, Undersize/Slip Fit and Oversize +.001
Sizes: Diameters from 1/32 to 1 inch and lengths from 3/32 to 6 inches
Materials: CRES 303, 400, 416 series stainless steel
Applications: Can be used as a hinge, shaft, precise location device or pivot to align or secure parts within a precision assembly or fixture

4 – Mil-Spec Slotted Spring Pins

Standards: MS16562
Styles: Slotted
Sizes: Diameters from 1/16 to ½ inch and lengths from 3/16 up to 3 inches long
Materials: Alloy steel with a zinc phosphate finish
Applications: Can be used as a hinge or shaft for the purpose of securing and fastening components together

5 – Mil-Spec Extended Prong Cotter Pins

Standards: MS9245
Styles: Extended Prong
Sizes: Diameters from 1/32 to 5/32 inch and lengths from 1/4 to 1/2 inches long
Materials: T321 stainless steel
Applications: Designed to retain/secure a variety of fasteners such as bolts, nuts and pins in place and prevent them from sliding or coming out

6 – Mil-Spec Hex Finished Nuts

Standards: MS51967B & MS51967C
Styles: Grades B & C
Sizes: Stock sizes from 1/4-20 through 3/4-10 inches thread
Materials: Alloy steel with a cadmium yellow finish
Applications: Used to fasten parts together by pairing and tightly securing bolts in place

7 – Mil-Spec Hex Machine Nuts

Standards: MS35649 & MS35650
Available Sizes: Stock sizes from 2-56 through 3/8 thread
Materials: Alloy steel cadmium yellow and 300/18-8 series stainless steel
Applications: Typically paired with bolts or screws to ensure parts/components stay firmly fastened in place

8 – Mil-Spec Washers

Standards: MS51848, NAS620, MS35333, MS35335, MS35338, AN960, AN960-C, AN970, MS15795, MS27183, NAS1149 & NAS620
Styles: flat, light flat, flat machine screw, split lock, high collar split lock, internal tooth lock, and external tooth lock
Materials: Carbon steel, Alloy steel and 300/18-8, 316, 400 series stainless steel
Applications: Distribute the load of a fastener, such as a bolt or screw, over a larger surface area. This in turn helps reduce the effects of wear, damage or vibration on the fastener assembly by providing a cushion between the fastener head and the parent material

9 – Mil-Spec Machine Screws

Standards: MS24693, MS35190, MS35191, MS35206, MS35207, MS35265, MS35266, MS35275, MS35276, MS51957, MS51958, MS51959, & MS51960
Styles: 82d & 100d Flat Phillips, Drilled Slotted Fillister, Philips Pan Head
Available Sizes: Diameters range from 0-80 to 3/8-16 inches with lengths ranging from 3/32 to 3 inches long
Materials: Carbon steel, Alloy steel, and 300/18-8 series stainless steel
Applications: Often used in conjunction with other fastening elements, such as washers and nuts, they have uniform threads that when fastened engage with corresponding threads in a tapped hole or nut, creating a secure mechanical connection between components

10 – Mil-Spec Precision Shoulder Screws

Standards: MS51576 & MS51575
Styles: Hex and slotted drives
Available Sizes: Stock sizes range from 4-40 to 3/8-16 thread
Materials: 300/18-8 series stainless steel
Applications: Feature a cylindrical unthreaded shoulder that serves as a dowel or pivot point for rotating parts, also used to hold parts together within a precision assembly

11 – Mil-Spec Hex Head Cap Screws/Bolts

Style: Hex head
Standards: MS35307, MS35308, MS90725, MS90726, MS90728G & MS90727F, B1821
Sizes: Stock sizes range from 1/4-20 through 1-1/4 diameter
Materials: Alloy steel, 300/18-8 Series Stainless Steel
Applications: Their hexagonal heads allow for the application of high torque using a wrench or socket, which enables a very tight and secure fastening for load-bearing structures in military vehicles, aircrafts and more

12 – Socket Head Cap Screws

Style: Socket head
Standards: NAS1352C / MS16995, NAS1351C / MS16996, MS16997, MS16998, NAS1351N & NAS1352N, & MS24671
Sizes: Stock sizes range from 0-80 through 1-1/2 diameter
Materials: Alloy steel, 300/18-8 series stainless steel, A286
Applications: These screws have a cylindrical head with a hexagonal recess (socket) that allows for tightening with an Allen wrench/hex key. The socket head design allows for use in applications where there is limited space. The hexagonal socket allows for precise control during assembly, ensuring the screw is driven straight and accurately into the desired position

Can’t find what you’re looking for in the list above? Send us an RFQ with the product description or part number that you are looking for and our MF Supply team of sourcing experts will help find what you need!

Why Buy Mil-Spec Fasteners from MF Supply?

When precision, compliance, and reliability are non-negotiable, MF Supply stands out as a trusted partner for mil-spec fasteners. Here’s why industrial buyers across aerospace, robotics, defense, and manufacturing sectors turn to MF Supply:

Compliance and Certification: MF Supply’s mil-spec fasteners meet stringent U.S. Department of Defense (DoD) specifications, including MS51830, MS51831, and more. Each fastener is available with Material and Physical Test Reports, Certificates of Conformance, and DFARS/Domestic Statements—providing peace of mind for critical applications.

Sourcing Expertise: MF Supply works with the best factories across fastener categories, offering tailored solutions based on your budget, delivery and certification needs.

Reliability Across Critical Industries: Serving aerospace, defense, robotics, automotive, and manufacturing sectors for over 50 years, MF Supply is a trusted partner for industries where delivery times, precision and reliability are non-negotiable.

Shop Over 3,000 Unique Mil-Spec Fasteners and Precision Hardware Directly on Our Website!

Manufacturers working with us can expect timely deliveries, competitive pricing, and access to expert guidance to help optimize their fastener choices. Manufacturers eager to explore our Mil-Spec products’ catalog, including our other recently expanded product categories, are encouraged to visit our website at www.mfsupply.com, reach out to us at sales@mfsupply.com or request a quote. Our MF Supply team of sourcing experts will help you find what you need. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Your Purchasing Department’s Secret Weapon!
Here are 5 reasons to buy from MF Supply

We Source and Deliver What Others Can’t, Faster Than You Imagined – With speedy solutions for elusive parts and lengthy delivery times – We’ve got you covered with both custom-made specials (send us your prints!) and hard-to-source options, quickly and at a fair price.
Cost-Effective Functional Equivalents to OEM Brand Fasteners-Why Pay More? – Reduce lead times and costs with the same quality and same performance. Try us for alternatives to brands like McMaster-Carr, MSC, Misumi, PEM, and RAF and experience unmatched savings! Same form, fit and function for less.
Huge Selection of Certified and Commercial Hardware with Same-day Shipping Available for Countless Items – We source and stock standards, specials, commercial, Mil-Spec & OEM brands in inch and metric sizes. Standards include AN, NAS, MS, IFI, ASTM, ASME, DIN, ISO, JIS. We are sourcing experts for inserts, certified Mil-Spec parts and anything in stainless steel. Many parts are available with manufacturers’ certifications, including DFAR, ROHS and CoC. Trust us to ship on-time from our national distribution centers.
A User-Friendly, 24/7 Online Shopping Experience – Enjoy a 24/7 online shopping experience with easy-to-use filters, detailed product information, and a constantly updated technical directory. Sign up now for a seamless experience!
WBE/WOSB Certified Woman-Owned Small Business – As a certified Woman-Owned Small Business, we support your diversity goals. Trust us to meet your fastener and sourcing needs with expertise and efficiency [Cage Code 58QG4].

Carbon Steel Key-Locking Inserts (AKA Keenserts®) at www.mfsupply.com

Posted: January 26, 2024 | Author: mfsupplyblog | Filed under: Brand equivalents, Carbon Steel Keenserts, Fasteners, Inch and Mil-Spec Keensert, keensert, key-locking inserts, Metric Keensert, Threaded Bushing, Threaded Fasteners | Tags: Carbon Steel, Carbon Steel Keenserts, Carbon Steel Key-Locking Insesrts, Fasteners, inch keenserts, Inserts, inserts for manufacturers, Keenserts, manufacturing, metric keenserts, mil-spec keenserts, RKK, RKK Keenserts, threaded bushing, threaded fastener | Leave a comment

MF Supply is an expert and industry leader when it comes to key-locking inserts, commonly known by the popular brand name Keensert®. We stock and source key-locking inserts in a wide variety of materials, platings and sizes, including Inch, Metric, Commercial and Mil-Spec options.

In today’s blog, we will showcase a comprehensive overview of Carbon Steel Key-Locking Inserts, covering their benefits, uses, styles, standards, sizes, and comparison with other key-locking inserts made from other materials — so you are all set before jumping off to procure them for your next project.

What are Carbon Steel Key-Locking Inserts?

Carbon Steel Key-Locking Inserts, often referred to in industry vernacular as Carbon Steel Keenserts®, are precision-engineered threaded inserts predominantly fabricated from high-grade carbon steel.

Featuring both internal and external threads, these inserts are adept at providing wear-resistant thread interfaces in substrates that are inherently susceptible to thread degradation or are insufficiently robust for the intended mechanical loads. The external threading of these inserts exhibits a larger diameter and pitch compared to the internal threads, ensuring a secure engagement with the parent material.

These components are specifically designed for thread reinforcement and repair applications across a broad spectrum of parent materials. Their key-locking mechanism involves the deployment of keys integrated into the insert body. Upon installation into a pre-tapped hole, these keys are driven outward into the parent material, thereby affording a secure mechanical lock that resists rotational and axial forces. Hence, this feature is pivotal in applications where vibrational loads or cyclic stresses are prevalent.

The versatility of Carbon Steel Key-Locking Inserts makes them beneficial for any sector requiring durable, reliable threaded connections, especially where materials are subject to wear, high stress, or require thread repair and reinforcement.

What Styles, Standards & Sizes Are Available?

Carbon Steel Keenserts®, or Key-Locking Inserts, have different styles in order to cater to a wide range of application requirements and material conditions. The distinct styles are designed to address specific challenges such as load capacity, space constraints, installation requirements, and the physical properties of the base material. Below is a list of all the styles available for these Key-Locking Inserts:

Thin Wall | RKKA | KNM: These are used when minimal space is available or in applications where less material needs to be removed. They offer a good balance between strength and size. Available off the shelf in Internal Thread 10-24 through 1/2-20 and Metric M5-M12. Often referred to by their original Fairchild part numbers: RKKA
Heavy Duty | RKK | KNHM: Designed for higher strength and durability, these are suitable for applications subject to high stress or where a stronger thread is required. Available off the shelf in Internal Thread 8-32 through 1-1/2, and Metric M4-M24. Often referred to by their original Fairchild part numbers: RKK
Extra Heavy Duty | KNHXH: These inserts are used in extremely demanding applications where very high pull-out and torque resistance is needed. Available off the shelf in Internal Thread 6-32 through 1-12. No standard Metric option available. Often referred to by their original Fairchild part numbers: KNHXH
Solid | KNJ: Unlike other types have both internal and external thread, solid inserts have only external thread. Once installed, they can be drilled and tapped as required. These solid inserts can be used to relocate misplaced holes, customize the internal threads, or plug existing holes. They are extremely durable but might require more installation space. Available off the shelf in External Thread 3/8-16 through 1-1/4 and Metric M8-M32. Often referred to by their original Fairchild part numbers: KNJ.

Commonly available in diameters from 6-32 through 1-1/2, Carbon Steel Key-Locking Inserts can be used in a wide range of applications from small electronics to heavy machinery. The thread pitch varies accordingly, with finer pitches for delicate applications and coarser pitches for heavy-duty applications.

Carbon Steel Key-locking inserts are generally offered as commercial parts, and don’t have a Mil-Spec equivalent. They come standard with a phosphate finish.

*Note – Carbon Steel Key-locking Inserts do not come with a Self-Locking option, which is a standard option with Stainless Steel Keenserts®.

The Carbon Steel Difference!

How do Carbon Steel Key-Locking Inserts stack up against other materials? Here’s the breakdown:

Stainless Steel: Stainless Steel Keenserts® are known for their corrosion resistance, especially in marine and chemical environments. However, Carbon Steel Key-Locking Inserts are generally stronger and more wear-resistant, which is beneficial in applications where the primary concern is strength rather than exposure to corrosive elements.
4140 Alloy Steel: This is a high-carbon alloy steel that provides excellent wear resistance and strength. While 440 Alloy Steel Keenserts® offer superior hardness, Carbon Steel Key-Locking Inserts typically excel in toughness and are more ductile, making them less likely to crack under high stress.
A286: A286 is an iron-nickel-chromium stainless steel alloy known for its high strength and corrosion resistance at elevated temperatures. Carbon Steel Key-Locking Inserts may not match the high-temperature performance but are significantly more cost-effective for applications where extreme temperatures are not a concern.
Nitronic 60: This material provides excellent galling and wear resistance. While it is superior in environments where these factors are critical, Carbon Steel Key-Locking Inserts offer a better balance of strength and cost-efficiency for general-purpose use.
Inconel: Known for its ability to withstand extreme temperatures and corrosion, Inconel is often used in high-temperature applications. Carbon Steel Key-Locking Inserts, on the other hand, are more widely used in applications where high temperature and corrosion are not as critical but where high strength and lower cost are important.

Hence, Carbon Steel Key-Locking Inserts offer an excellent balance of performance and value, making them a preferred choice for applications where the benefits of higher-cost, specialized materials are not required. They stand out for their strength, toughness, and cost-effectiveness, providing a reliable and affordable solution for thread reinforcement and repair.

Carbon Steel Key-Locking Inserts at MF Supply!

MF Supply is a WBE/WOSB certified business, and a leading supplier of Carbon Steel Key-locking Inserts (AKA Keenserts®) for manufacturers, government and industry. At MF Supply, we understand the dynamic needs of the industry, including the balance of price, quality, availability and certification paperwork. Ready to see how we can help you make a difference?

Visit our website or browse through the links provided below to discover the perfect Carbon Steel Key-Locking Inserts for your next project!

Inch Carbon Steel Key-locking Inserts:

Metric Carbon Steel Key-locking Inserts:

Note – Installation requires a drill bit, a standard tap, an installation tool, and a hammer. Feel free to ask us about Keensert® Kits available for many Carbon Steel sizes. Kits include a minimum of 2 inserts, a drill bit, a tap and an installation tool.

Do you still have questions or would like to speak with a representative? Reach out to us, and our MF Supply team of sourcing experts will help you find what you’re looking for. “The right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Creatively Solve Problems – We are sourcing experts and specialize in hard to find parts. We offer custom manufacturing and reworking solutions at competitive pricing, reducing long deliveries.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

MF Supply is a WBE/WOSB certified supply chain partner to business, industry and government. We are sourcing experts and stocking distributors of Hardware, Precision & Mil-Spec Fasteners and Safety supplies, with an expertise in inserts, military fasteners and stainless steel hardware. For more than 50 years, we have been supplying manufacturers in the electronics, industrial, commercial, aerospace and military markets with the full range of fastener products and services. Our Cage Code is 58QG4 and our registered name is RL Supply Inc dba MF Supply.

Domestic Socket Products at www.mfsupply.com!

Posted: January 11, 2024 | Author: mfsupplyblog | Filed under: American Sockets, Blue Devil, Brand equivalents, dowel pin, Fasteners, Inch, Metric, Metric Dowel Pins, PRECISION DOWEL PIN, Socket Head Cap Screw, Socket Products, Socket Set Screws, Socket Set Screws Cone Point, Socket Set Screws Cup Point, Socket Set Screws Flat Point, Socket Set Screws Half-Dog Point, Socket Set Screws Knurled Cup Point, Socket Set Screws Nylon Tip, Socket Set Screws Oval Point | Tags: American Sockets, Black Oxide Dowel Pin, Blue Devil, Button Head Cap Screws, Domestic Socket Products, dowel pins, Ebony Bright Dowel Pin, Fasteners, Flat Head Cap Screw, Low Head Cap Screws, manufacturing, Mechanical Fasteners, Mil-spec fasteners, Precision Dowel Pin, Socket Head Cap Screw, Socket Set Screws | Leave a comment

Greetings to our precision manufacturing community!

We are reaching out with an important announcement regarding our domestic sockets product lines. As we continuously strive to bring you the best in quality and service, we want to inform you of a significant change in our offerings.

Did You Know That Blue Devil® Is Now American Sockets?

Firstly, we want to address a key change: the Blue Devil® brand, a name many of you have come to trust and rely on for your domestic socket products needs, will no longer be produced. This marks the end of an era, but also the beginning of an exciting new chapter.

We are thrilled to introduce American Sockets – a new brand of domestic socket products! This transition is more than just a change in name; it’s a reaffirmation of our continued commitment to quality and excellence.

What This Means for You

Continuity in Quality and Manufacturing: While the brand name changes, what remains constant is the quality of the products. American Sockets are manufactured by the same esteemed US manufacturers that produced the majority of the Blue Devil products. This ensures that the products you’ve trusted for years will continue to be of the same high standards.
Seamless Transition: We understand the importance of consistency in your operations. Rest assured, that this transition from Blue Devil to American Sockets will be seamless, with no compromise in the product quality or variety that you have come to expect.

Domestic Socket Products at MF Supply

MF Supply is a WBE/WOSB woman owned business, and leading supplier of Domestic Socket Products including major OEM brands, such as American Sockets, and brand equivalents, in various sizes and materials. We offer options when it comes to made in the USA, DFAR compliant Socket Products. Many of our products are available with Certificate of Conformance and full certifications available upon request.

Here are links to the American Socket brand of Inch Domestic Socket Product Lines:

Here are links to the American Socket brand Metric Domestic Socket Product Lines:

In addition to American Sockets brand Socket Products, we offer a vast choice of socket products, including Mil-Spec, OEM branded, standards and custom made specials. To search for what you need, use our Search bar, then filter by size, material, specification, or other qualities you are seeking. Alternatively, you can check out these handy links to view by category:

Do you still have questions or would like to speak with a representative? Reach out to us, and our MF Supply team of sourcing experts will help you find what you’re looking for. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Creatively Solve Problems – We are sourcing experts and specialize in hard to find parts. We offer custom manufacturing and reworking solutions at competitive pricing, reducing long deliveries.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

Inch & Metric Carriage Bolts Now Available at www.mfsupply.com!

Posted: December 15, 2023 | Author: mfsupplyblog | Filed under: Bolts, Bolts, Brand equivalents, Carriage Bolts, Carriage Bolts, Fasteners, Inch, Metric | Tags: Black Carriage Bolts, Black Oxide, Bolts, Bolts for Manufacturers, Carriage Bolts, Fasteners, Grade 2, Grade 5, Grade 8, Hot Dip Galvanized Carriage Bolts, Inch Carriage Bolts, Low Carbon Steel Carriage Bolts, manufacturing, Mechanical Fasteners, Metric Carriage Bolts, Stainless Steel Carriage Bolts, Zinc, Zinc Yellow | Leave a comment

In the realm of industrial manufacturing and engineering, Carriage Bolts often go unnoticed, yet they play a pivotal role in ensuring structural integrity and reliability. This versatile fastener, commonly known for its unique design featuring a rounded head and a square shank, is a cornerstone in a myriad of applications, such as construction and industrial projects. But just like many other popular fasteners, one size isn’t the right fit for all applications, and this is also the case with Carriage Bolts. So how do you make the right choice?

In today’s blog we will enlighten you about the key aspects of Carriage Bolts, covering their unique features, standards, materials, sizes, strengths/grades, uses and anything else you should know before setting off to buy them for your next big project!

What are Carriage Bolts?

A Carriage Bolt is a type of fastener that belongs to the bolt family. It is characterized by a domed or rounded head and coupled with a square section just beneath the head. This distinctive shape allows the bolt to sit smoothly against surfaces while the square part locks into the material, preventing the bolt from rotating or turning when the nut is being tightened.

Commonly used in industrial manufacturing and construction, they are ideal for metal-to-metal or metal-to-wood connections, providing a secure and aesthetically pleasing joint. Available in various materials like carbon steel, stainless steel, and alloy steel, and conforming to specific standards like ASME 18.5, SAE J429 and DIN 603 carriage bolts come in a range of sizes and grades to suit different mechanical and environmental requirements. Their versatility and reliability make them a staple in heavy-duty applications where robust fastening is essential.

Who Uses Carriage Bolts?

The robust nature of Carriage Bolts makes them an indispensable asset in many sectors, each valuing their unique combination of strength, security, and aesthetics.

Construction and Building Industry: In the construction and building industry, they are essential for timber framing and outdoor decking, ensuring durability and safety.
Automotive and Heavy Machinery Sectors: The automotive and heavy machinery sectors rely on them for vehicle assembly and manufacturing robust equipment.
Marine and Coastal Applications: In marine and coastal applications, particularly, stainless steel Carriage Bolts are prized for their resistance to saltwater corrosion, vital in boat building and dock construction.
Railway Industry: Their use also extends to the railway industry for maintaining railway lines and infrastructure.
Aerospace Industry: Even in aerospace, though less common, Carriage Bolts find a place in non-critical applications, appreciated for their ease of installation and tamper-resistant design.

Whether you’re in construction, automotive manufacturing, aerospace or marine applications, Carriage Bolts play a pivotal role, underscoring their versatility and the trust placed in them by many professionals. Remember, when you’re choosing Carriage Bolts, you’re not just buying a component; you’re investing in the integrity and longevity of your entire project.

What Styles, Standards, Materials, Finishes & Sizes Are Available?

Carriage Bolts’ Styles

The world of Carriage Bolts is vast and varied, catering to a wide range of applications. Understanding this diversity is key to selecting the right bolt for your project. The traditional round head and square neck style is commonly used, but there are other types like Ribbed Neck or Knurled Neck bolts, which offer extra grip. Short Neck variants are useful in tight spaces, while Shaker Screen bolts are designed to withstand high-vibration environments. For specific fitting requirements, Under Sized Body bolts might be the solution, and Flat Head Carriage Bolts are ideal when a flush surface finish is needed. This variety demonstrates how specific designs cater to unique functional needs.

Quality Standards

Carriage Bolts are manufactured according to various quality standards, such as ASME 18.5, SAE J429, and DIN 603. These standards ensure consistency in dimensions, strength, and durability. They also play a crucial role in ensuring that carriage bolts meet the necessary safety and performance requirements across different applications. For instance, a bolt compliant with these standards would have reliable tensile strength and dimensional accuracy, making them suitable for a range of uses from construction to machinery assembly.

Materials

Different materials are used in the manufacturing of Carriage Bolts to suit various environmental and mechanical demands.

Low Carbon Steel Zinc: Commonly used for standard Carriage Bolts. The zinc coating provides a layer of corrosion resistance. Offers a good combination of tensile strength and ductility, making it suitable for light to medium load applications.
Grade 5 Steel: Contains a higher carbon content than low carbon steel, resulting in increased strength. Often used in automotive and construction applications where higher strength is needed. Provides a good balance between strength and flexibility, making it less likely to break under high stress.
Grade 8 Steel: Contains an even higher carbon content than Grade 5, offering superior strength and hardness. Commonly used in demanding applications like heavy machinery and military equipment. Ideal for applications where the bolt must withstand high stress or sudden impact without deforming.
Stainless Steel 18-8: Composed of approximately 18% chromium and 8% nickel, hence the name 18-8. Offers excellent resistance to corrosion and oxidization. Widely used in environments where exposure to water, chemicals, or saline is common.
Stainless Steel A2: Similar to 18-8 stainless steel but with slight variances in the alloy composition. Common in food processing equipment and outdoor furniture. Resistant to corrosion and staining, making it ideal for aesthetic applications as well.
Stainless Steel A4: Also known as marine grade stainless steel. Contains higher levels of nickel and added molybdenum for enhanced corrosion resistance. Ideal for use in highly corrosive environments such as marine, coastal, and tropical climates.

Finishes

The finish of a carriage bolt not only affects its appearance but also its functionality, especially in terms of corrosion resistance. Black Oxide and Black Zinc finishes offer a degree of corrosion resistance along with an aesthetically pleasing look. For environments with high moisture, Hot Dip Galvanized bolts are an excellent choice for their superior corrosion protection. Zinc-Plated and Zinc-Yellow finishes are also popular, offering a balance between corrosion resistance and affordability. Understanding these options is essential for selecting a bolt that not only fits the technical requirements but also withstands environmental conditions.

Sizes Available

The size of a carriage bolt is also another critical factor in ensuring its effectiveness in a given application. The range of sizes available is extensive, from 6-32 through 7/8-9 for inch sizes to M5-0.8 through M12-1.75 for metric DIN 603 sizes. This broad spectrum of sizes accommodates everything from large-scale industrial needs to smaller, custom projects. Selecting the appropriate size is vital for the bolt’s performance, as it affects the strength of the joint and the overall integrity of the project.

How to Order Them

On our website, navigate to the Search bar and type “Carriage Bolt,” and hit the Search Button.

Once the results are listed and the filter appears on the left of the results page, select your desired attributes to get the specific Carriage Bolt(s) you need. Common attributes available in our filters include:

Inch or Metric
Head Style
Size (Diameter & Thread)
Length
Material
Finish
Other Type (Full or Partial thread or Flank Degree)
Standard (ASME, SAE, DIN)

Carriage Bolts at MF Supply

MF Supply is a WBE/WOSB certified business, and a trusted supplier of Carriage Bolts to manufacturers, government and industry. At MF Supply, we understand the dynamic needs of the manufacturing industry, including the balance of price, quality, availability and certification paperwork. The expansion of our product catalog to include Carriage Bolts in a myriad of styles, materials, and sizes demonstrates our commitment to being a one-stop solution for all your fastener needs.

Visit our website or browse through the links provided below to discover the perfect Carriage Bolt(s) for your next project!

Inch Carriage Bolts
Metric DIN 603 Carriage Bolts
Please send a Request for Quote for any other Carriage Bolt(s) not listed on our website.

Do you still have questions or would like to speak with a representative? Reach out to us, and our MF Supply team of sourcing experts will help you find what you’re looking for. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Creatively Solve Problems – We are sourcing experts and specialize in hard to find parts. We offer custom manufacturing and reworking solutions at competitive pricing, reducing long deliveries.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

Inch & Metric Nitronic Keenserts® Now Available at www.mfsupply.com!

Posted: November 15, 2023 | Author: mfsupplyblog | Filed under: Brand equivalents, Fasteners, Inch and Mil-Spec Keensert, keensert, key-locking inserts, Metric Keensert, Nitronic 60 Keenserts, Threaded Bushing, Threaded Fasteners | Tags: Fasteners, inch keenserts, Inserts, inserts for manufacturers, Keenserts, manufacturing, Mechanical Fasteners, metric keenserts, Mil-spec fasteners, mil-spec keenserts, Nitronic 60, Nitronic 60 Keensesrts, Nitronic Keenserts, threaded bushing, threaded fastener | Leave a comment

In the bustling world of manufacturing and engineering, where every component counts and the margin for error is slim, MF Supply recognizes the intricacy involved in sourcing materials that offer both superior performance and extended durability. This is where our friends, the Key-locking Inserts (AKA Keenserts®) become the stars of the show. Today, we’re turning the spotlight on an insert that’s been making waves in the industry: the Nitronic 60 Key-locking Insert!

If you’re on the quest for Key-locking Inserts that promise to elevate the integrity of your projects, you’re in the right place. Nitronic 60 key-locking Inserts are not just components; they’re your peace of mind molded into high-performance alloy.

Why Nitronic 60 Key-locking Inserts? The Vanguard of Resilience

Picture a material that laughs in the face of wear, shrugs off corrosion, and doesn’t flinch under high torque. That’s Nitronic 60 for you — an alloy steel that’s as tough as they come. Crafted from this robust alloy, Nitronic Key-locking Inserts boast unparalleled wear and galling resistance. For those of you constantly battling the wear and tear that comes with mechanical demands, these threaded inserts are your knights in shining armor. Think of them as the silent guardians against the everyday wear-and-tear that can compromise your work.

The Rust Doesn’t Sleep, But You Can

Corrosion is the arch-nemesis of metal, lurking and waiting to undermine your structures. But with Nitronic 60’s exceptional corrosion resistance, rest easy knowing that your components are as steadfast as your ambition. Whether it’s the salty bath of marine environments or the demanding conditions of chemical processing, they’ve got you covered.

Strength That Speaks Volumes

Nitronic 60 Key-locking Inserts don’t just resist wear; they embrace strength. High stress, high torque — bring it on! The formidable might of Nitronic 60 makes these Key-locking Inserts the backbone for applications that can’t afford to falter, from the aerospace zeniths to the depths of automotive innovation.

The Nitronic 60 Difference

We hear you asking, “But how do they stack up against other materials?” Here’s the deal:

Nitronic 60, as a material, is a high-performance stainless steel alloy known for its excellent strength and resistance to wear and galling. This versatile alloy provides exceptional resistance to high temperature oxidation, crevice corrosion and general corrosion, making it well suited to marine and chemical applications. Key-locking inserts made from Nitronic 60 are used in various applications where high strength and corrosion resistance are a must.

Carbon Steel Inserts: Compared to standard steel, Nitronic 60 offers superior resistance to corrosion and galling.
Stainless Steel Inserts: Among stainless steels, Nitronic 60 typically outperforms varieties such as 304 or 316 in wear resistance.
Inconel Inserts: Inconel excels in high-temperature applications but comes at a higher cost and greater machining difficulty than Nitronic 60.
4140 Alloy Inserts: 4140 Alloy provides greater tensile strength and enhanced performance at high temperatures, although it falls short in corrosion resistance and often necessitates protective coatings. Nitronic 60 is better suited for applications involving friction at moderate temperatures.
A286 Inserts: A286 excels in high-temperature applications, maintaining higher strength at elevated temperatures, though it’s tougher to machine and more expensive than Nitronic 60.

A Spectrum of Possibilities

We’re not about “one-size-fits-all” because we know your engineering needs are as unique as your blueprints. That’s why we offer Key-locking Inserts in inch, mil-spec and metric sizes that are tailored to the scope and scale of your vision — common internal diameters include #2-56 through 1 1/2-6 for inch & mil-spec sizes, and M2 through M24 for metric sizes. And with varying lengths at your disposal, the only limit is the application and your imagination. Materials

Compliance with stringent industry standards is not just a promise; it’s our practice. Our inserts meet or exceed critical aerospace and military specifications, ensuring that they deliver in applications where there is no room for error. Standards available include MS51830, MS51831, MS51832, NAS1394 and NAS1395. Series available include Miniature KNC, Thin Wall KN & KNM, heavy-duty KNH & KNHM, and extra heavy-duty series KNHXH.

Whether you’re in aerospace, automotive, defense, or any field that demands unyielding materials, these inserts are ready to serve. They’re the go-to for applications that require repeated assembly and disassembly, ensuring longevity and reliability every step of the way.

Discover More, Achieve More

MF Supply is a WBE/WOSB certified business, and a trusted supplier of Nitronic 60 Key-locking Inserts (AKA Keenserts®) for manufacturers, government and industry. Eager to delve deeper into the world of Nitronic 60 Key-locking Inserts? Visit our website, where innovation is just a click away, and join the ranks of manufacturers and engineers who don’t just build, but inspire.

With Nitronic 60 Key-locking Inserts, it’s not just about holding things together; it’s about unlocking possibilities. Discover the sizes, standards, and the success that our inserts can enable.

Inch & Mil-Spec Nitronic 60 Key-locking Inserts

Metric Nitronic 60 Key-locking Inserts

Do you still have questions or would like to speak with a representative? Reach out to us, and our MF Supply team of sourcing experts will help you find what you’re looking for. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Creatively Solve Problems – We are sourcing experts and specialize in hard to find parts. We offer custom manufacturing and reworking solutions at competitive pricing, reducing long deliveries.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

Precision Dowel Pins for Manufacturers: A Comprehensive Guide

Posted: August 24, 2023 | Author: mfsupplyblog | Filed under: dowel pin, Fasteners, Inch, Metric, Metric Dowel Pins, Mil-Spec, Pins, PRECISION DOWEL PIN | Tags: ASME B18.8.2, Bulk Pins, Custom Dowel Pin, Dowel Pins for Manufacturers, Fasteners, Functional Equivalent Pins, Hardware, Heavy Duty Fasteners, Inch Dowel Pins, Mechanical Fasteners, Metal, Metric Dowel Pins, Mil-Spec Dowel Pins, MS16555, Pins, Pins for manufacturers, Precision Dowel Pin, Precision Fasteners | Leave a comment

Considering Precision Dowel Pins for Your Next Project?

When you’re in the heart of the manufacturing industry, precision is not just a luxury; it’s a necessity. Components like dowel pins may seem small and inconsequential, but in this realm of precision manufacturing, they are paramount to ensuring accurate alignment and fit. Precision dowel pins, in particular, play an indispensable role in guaranteeing accurate alignment and secure fastening in a broad spectrum of applications. But with various tolerances, standards, materials, and sizes available, how do you make the right choice? It is important to know and understand these factors in order to make informed decisions that will meet your expectations & manufacturing needs.

What are Precision Dowel Pins?

At their core, precision dowel pins are simple cylindrical rods. The term “precision” implies that these pins are manufactured to very tight tolerances in order to ensure accurate fit in assemblies. Tolerances refer to the acceptable variation in dimensions from the specified value. The tighter the tolerance, the less variation there is—meaning that their dimensions are incredibly accurate. This precision ensures that dowel pins fit snugly into corresponding holes in two components, ensuring their exact/accurate alignment.

Standards & Tolerances

Several standards are followed in the production of precision dowel pins. The prevalent standard specifications come from the International Organization for Standardization (ISO), the Deutsche Industrie Norm (DIN), the American National Standards Institute (ANSI), and the Military Standard (MS/MIL-SPEC) of the United States. At a minimum, these standards specify the pin shape, and the diameter and length tolerance. These standards might also specify the pin hardness and surface finish. OEM branded dowel pins are handled separately and are addressed later in this blog.

ISO Standard: ISO 2338A & ISO 2338B (for unhardened pins) and ISO 8734 (for hardened pins) are common standards for dowel pins. Under these standards, precision dowel pins can be manufactured to either “M6” or “M5” tolerance classes, with “M6” being the more common of the two.

For example, an “M6” tolerance for a 5 mm dowel pin might have a diameter tolerance of -0.014 to 0 mm. So, the pin could be anywhere from 4.986 mm to 5 mm in diameter.

DIN Standard: DIN 7 (for unhardened, solid dowel pins) and DIN 6325 & DIN 6325H (hardened, solid dowel pins). Similar to ISO standards, the typical tolerance for precision dowel pins under DIN standards is designated as “M6.” This is the standard fit for dowel pins and ensures a tight fit that might require light pressing or can sometimes be hand-driven depending on the exact material and hole conditions.

For example, for a 5 mm dowel pin under the DIN 7 or DIN 6325 standard, the typical diameter tolerance might have and upper limit of 5.000 mm & a lower limit of 4.986 mm.

ANSI Standard: ANSI standard for dowel pins is ASME/ANSI B18.8.2. This standard defines sizes and tolerances for standard dowel pins, with the “Standard Series” being the most common.

For example, for a 1/4 (.25) inch interference fit diameter pin, the diameter tolerance might be +0.0002 to 0.000 inch. So, the pin diameter could be anywhere from 0.2500 inches to 0.2502 inches in diameter.

MIL-SPEC Standard: MIL-SPEC standard for dowel pins, particularly those conforming to MS16555 and MIL-P-21143 have very specific tolerances to ensure reliability and consistency in critical military and aerospace applications.

The MS16555 specifies a straight headless pin with a radius on one end and a chamfer on the other. The material can be Carbon or Alloy Steel or CRES 410 or 416 Stainless Steel. Available diameters range from 1/16 (.0626-.0628) through 1 inch (1.0003-1.0001). Lengths range from 3/16 to 6 inches long. Standard diameter tolerances are +.0002 over the nominal size.
The M21143 specifies a a straight headless pin made of CRES 303 Stainless Steel. The Mil-P-21143/1 series has a tolerance up to +.0002 over the nominal size. The M21143/2 series has tolerance of .0002 Under its nominal size.

Material Choices

Different applications may require Precision dowel pins made from different materials. The most common materials in the market include:

Stainless Steel: Offers corrosion resistance and is suitable for applications exposed to moisture or corrosive substances.
Alloy Steel: Known for its strength and durability, it’s ideal for heavy-duty applications.
Brass: Often used when there’s a need to avoid sparking or in applications with lower strength requirements (less common).
Aluminum: Lightweight and resistant to corrosion, aluminum precision dowel pins are suitable for applications where weight is a concern (less common).

Sizes Available

The diameter of precision dowel pins usually varies from 1/32″ to more than 1″, and their lengths span from 3/16″ to multiple inches. Hence, precision dowel pins come in a wide range of sizes, but certain sizes are more commonly used across various manufacturing applications due to their adaptability and compatibility with standard components. Selecting the appropriate size for your specific application is essential for achieving a snug fit, best performance, cost-effectiveness, and durability.

OEM Branded Precision Dowel Pins

Precision Dowel Pins – OEM branded “Precision” dowel pins are manufactured by precision component brands such as Pic Design, WM Berg, Unicorp and others who have their own technical specifications and are not governed by DIN, ISO or ANSI / ASME standards. They are usually only offered in stainless steel through distributors of precision components.

What to Consider Before Buying

Tolerance: Precision dowel pins have tight tolerances. Ensure that the pins you buy meet the specific tolerances required for your application.
Environment: Consider the environment in which the pins will be used. If they’ll be exposed to corrosive substances or high temperatures, material choice becomes crucial.
Custom Needs: If your application requires non-standard sizes or materials, you might need custom-made precision dowel pins.
Quantity: Depending on the scale of your manufacturing, you may need precision dowel pins in bulk. Purchasing in larger quantities often results in cost savings!
Supplier Reputation: Always source your precision dowel pins from reputable suppliers known for their quality and consistency.

Precision Dowel Pins at MF Supply

MF Supply is a WBE/WOSB woman owned business, and a trusted supplier of Functional Equivalents, including precision dowel pins, to OEMs, manufacturers, industry, and government. We are precision dowel pin experts, offering the full catalog of dowel pins in Inch, Metric, Military and OEM branded options in a wide selection of materials, sizes and specifications. As stocking distributors, many precision dowel pins are available and ready to ship today from our national distribution centers.

Browse through the links provided below to find the precision dowel pins that you need:

Mil-Spec Precision Dowel Pins: The full range of commercial and MIL-SPEC parts (M21143, MS16555, MS9390), including parts that are USA made, DFARS and ROHS compliant.
Inch Precision Dowel Pins: inch sizes to ASME ANSI B18.8.2 standards in alloy steel, stainless steel 18-8, 316, 400 series and hardened. Domestic and Imported options are available.
Metric Precision Dowel Pins: Metric sizes including DIN 7, DIN 6325, and ISO 2338 and 8734 in alloy steel, A2 & A4 stainless steel
Precision Series and OEM branded equivalents to PIC, BERG, both Inch & Metric precision dowel pins including Press-Fit A, B and Slip-Fit C series and all MD series pins in 416 and 303 stainless steel.
Please send us a Request for Quote for any other dowel pins not listed.
Custom made parts per print.

Your next step?

If you have additional questions or need help in selecting the right precision dowel pins for your next project, don’t hesitate to reach out to us or send us a quote request. Our team of sourcing experts is always ready to assist you on your journey to manufacturing excellence. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Creatively Solve Problems – We are sourcing experts, offer competitive pricing and specialize in finding hard to find parts and reducing long deliveries.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

Cotter Pin!? What the heck is that?

Posted: August 1, 2023 | Author: mfsupplyblog | Filed under: Circle Cotters, Cotter Pin, Fasteners, Hair Pin Clip, Hitch Clips, Inch, Locking Pins, Metric, Mil-Spec, Pins, R Clips, R Pins, Retaining Rings, Safety Pins, Split Pins | Tags: ASME B18.8.1, Bulk Pins, Circle Cotters, Cotter Pins, cotter pins for manufacturers, Fasteners, Functional Equivalent Pins, Hardware, Heavy Duty Fasteners, Hitch Pins, Inch Cotter Pins, Locking Pins, Mechanical Fasteners, Metal, Metric Cotter Pins, Mil-spec Cotter Pins, MS9245, Pins, Pins for manufacturers, R Clips, R Pins, Safety Pins, Split Pins | Leave a comment

Welcome back to the next installment of our “what the heck is that” series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. This week, we are introducing you to our friend, the Cotter Pin!

Cotter Pins, AKA Split Pins, R Clips or R Pins, Hitch Pins or Hitch Clips, Safety Pins, Circle Cotters, Retaining Pins or Locking Pins, may not be the most renowned piece of hardware, yet they have been quietly holding together our world in more ways than you might imagine. For starters, these pins are non-threaded fasteners, which means that they do not have the risk of loosening due to vibrations as is the case in some screw or bolt connections. Furthermore, Cotter Pins are easy to install/remove and are inexpensive to produce—making them valuable & cost-effective components that guarantee the stability and functioning efficiency of numerous mechanisms across a variety of industries. Keep reading to learn more about these pins and to see if they would be a great fit for your next big project.

What are Cotter Pins?

Cotter Pins are double-structured pins crafted from semi-round wires, that have a loop on one end that serves as a head. The completed component showcases one wire end extending past the other, ending with a chisel-like point.

At the most basic, cotter pins are fasteners that are used to secure various assemblies in place. Typically, they are shaped like a “T” or an “R”, and are inserted into holes that run through the parts to be connected. They are then split into two prongs at the opposite ends, which are then bent to prevent the pins from slipping out and to securely hold the assemblies together.

One key advantage of cotter pins is their inherent simplicity. With their straightforward design, they can be easily installed and detached without the necessity for any specific tools. Furthermore, they offer robust links that prevent the secured pieces from becoming loose or disassembled. When used with castle or slotted nuts, they become a safety locking device.

Another important benefit offered by cotter pins is their ease of removal, which enables swift disassembly or maintenance tasks. When the need arises to dismantle/disassemble components, cotter pins can be easily taken out by straightening or bending back their split ends to their original position. This feature simplifies repair or maintenance operations.

Cotter pins also allow for a certain degree of motion (pivot) depending on how they are installed. This is beneficial in applications like bicycle crank arms where you want the crank to remain secure while also allowing it to rotate.

Who uses Cotter Pins?

Cotter Pins are widely used across a range of industries due to their simplicity, reliability, and versatility. The following are some primary industries where cotter pins are frequently employed:

Aerospace Industry: Cotter Pins play a vital role in the aerospace industry, where safety and reliability are paramount. They are used to secure critical components such as landing gear, engine parts, and control linkages, ensuring that they remain in position during flight. For example, control linkages encompass control surfaces such as ailerons, elevators, and rudder, as well as the cockpit controls, all of which have numerous pivot points requiring both security and mobility. Cotter Pins are perfectly suited for these uses.
Automotive Industry: In the automotive industry, cotter pins are utilized in various components, particularly in suspension systems, steering linkages, transmission linkages, wheel assembly, brake system, etc. They secure ball joints, tie rod ends, and other critical parts to ensure safe and reliable vehicle operation.
Agriculture Industry: In the agricultural sector, cotter pins serve the purpose of fastening elements in various farming machinery, including plows, harrows, and cultivators. Cotter pins also find use in several components of tractors, including anchoring the joint connections in the steering mechanism, maintaining components in the transmission system, and fastening parts in the hydraulic systems.
Marine Industry: Within the marine industry, Cotter Pins are widely employed to secure clevis pins, turnbuckles, and various fittings in rigging systems and boat hardware. For instance, within marine engines, cotter pins are often used to secure various components and assemblies, such as linkages, connections, and valves. Offering a swift and secure fastening solution, these pins demonstrate reliability even in corrosive marine environments.
Military and Defense: In the military and defense industries, cotter pins are used to fasten components in weapons, vehicles, aircrafts, naval assets, and communication equipment. In addition, Cotter Pins are deployed in a wide array of other portable gear and systems utilized by military personnel in operational settings. These can encompass everything from temporary bridges and fortification structures.

Other industries that make use of Cotter Pins are: the Industrial and Machinery Industry, where Cotter Pins are used for securing components, such as pulleys, gears, and levers; the Mechanical and Electrical Engineering Industry, where they are used to to fasten parts, such as bolts, nuts, and shafts; the Recreational and Sports Equipment Industry, where they secure various moving parts and components found in recreational equipment, such as bicycles, motorcycles, and sports gear; the Construction and Heavy Equipment Industry, where these pins are used for various applications, including securing hitch pins, linkages, and hydraulic connections; and the Furniture and Manufacturing Industry, where these pins are utilized to secure joints, hinges, and other components in conveyor systems, furniture assembly, and .

What standards, materials and sizes are available?

Materials: Cotter pins can be manufactured from different materials like steel, stainless steel, brass, and aluminum. Steel cotter pins are often enhanced with a zinc coating for added resistance to corrosion. Stainless steel pins are favored for their superior strength and corrosion resistance, particularly in harsh environments.

Sizes: Cotter pins come in a spectrum of sizes, generally ranging from 1/32″ to 3/4″ in diameter and 1/2″ to 6″ in length. The appropriate size is dictated by the application and the dimensions of the hole where the pin will be placed.

Standards: Various nations and regions adopt their own standards for cotter pins. Some of the most frequently used ones include the American Society of Mechanical Engineers (ASME), American National Standards Institute (ANSI), British Standards (BS), Military Specification (Mil-Spec) Standard, and the Deutsches Institut für Normung (DIN).

Commercial Standards include: ASME B18.8.1

Mil-Spec standards include: MS9245

Are there other factors to consider?

YES!! The efficacy of cotter pins are greatly influenced by their proper installation and maintenance. The following list has crucial points to keep in mind.

Selection: Opt for cotter pins that fit into the hole securely without being overly tight. The length should be sufficient for the prongs to be bent appropriately without leaving excessive overhang.
Installation: During installation, ensure the prongs are split and bent sufficiently to secure the pins. Tools like pliers or a cotter pin puller can aid in the process of installation and removal.
Inspection: Regular checks on cotter pins are crucial, particularly in applications under high-stress or where safety is paramount. Look out for signs of wear, corrosion, or distortion, indicating potential need for replacement.
Replacement: When extracting cotter pins, it’s typically advised to substitute them with new ones, as the bending and straightening process can fatigue the metal, undermining their strength.

Cotter Pins at MF Supply

We currently offer:

A full range of commercial parts, including parts that are ROHS compliant.
Inch Cotter Pins are now available for online purchase at our website! Stock sizes include 1/16 through 1/2 in Steel with a Chisel Point and Zinc Plating, as per standard ASME B18.8.1 specifications.
Mil-spec Cotter Pins MS9245 are also available for online purchase. Stock sizes include 1/32 through 5/32 in T321 Stainless Steel , with Manufacturers Certifications.
Please send a Request for Quote for any other Cotter Pin not listed on our website.
Brand names and generic equivalents.
Custom made parts per print.

For more detailed information on Cotter Pins or other products, visit us at our website or Request a Quote today, and our MF Supply team of sourcing experts can help you find what you need. “Finding the right screw for you” is our tag line after all!

Book a one-on-one consultation with our President, Robin, to discuss how MF Supply can help you solve your Industrial Sourcing, Fastener, and Safety concerns.

Six Reasons To Buy From MF Supply

Full eCommerce Enabled Website With Technical Manual Available 24/7 – Visit our website and Create a New Account, track online orders, browse our product catalog, check technical specs, subscribe to our blog, or buy online. We are adding items and improving functionality daily!
Same Day Shipping From The USA – Our hardware products are in stock and ship to you directly from our USA based distribution centers.
Functional Equivalents To Expensive Brand Names- We stock and source alternatives to brand name fasteners, reducing long lead times and saving you money.
Creatively Solve Problems – We are sourcing experts, offer competitive pricing and specialize in finding hard to find parts and reducing long deliveries.
One-Stop Shopping On Certified Hardware – We stock and source a full line of fasteners including Mil-Spec, DFARS compliant and other industrial products.
WBE/WOSB Woman Owned Certified Small Business – To meet your diversity & set-aside needs.

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