Check out MF Supply’s 2023 Keensert® Cross Reference Tables!

Keensert® Equivalent Cross Reference: Find OEM brands, Mil-spec & Functional Equivalents

Although the name Keensert® is often used to describe what is generically called a Key-locking insert (like Band-Aid® or Kleenex®), Keensert® is the registered trademark of Huck Patents (its close cousin, the Keysert® is a registered trademark of Alcoa Fastening Systems). Using functional equivalents, including Mil-Spec, generics and other OEM brands’ versions of key-locking inserts, is a practice many manufacturer’s use to save money and shorten lead times.

Checkout our three most popular Keylocking Insert cross reference charts to see if there is a Functional Equivalent to your Keensert® OEM brand, and start saving money and reducing lead times immediately.

Inch & Mil-Spec Keensert®


Miniature, Thinwall & Lightweight, Heavy Duty, Extra Heavy Duty, Keylocking Inserts in Stainless Steel, A286, 4140 Alloy. Includes MS51830, MS51831, MS51832, KN, KNC, KNL & KNCL Series.

Metric Keensert®

4140 Alloy, A286, & Mill-Spec

Miniature, Thinwall & Lightweight, Heavy Duty, Keylocking Inserts in A286 & 4140 Alloy. Includes NA0146, NA0147, NA0148, NA0149, NA0150, NA0151, KN, KNC, KNL & KNCL Series.

Metric Keensert®

Stainless Steel

Miniature, Thinwall & Lightweight, Heavy Duty, Keylocking Inserts in Stainless Steel, KN, KNC, KNL & KNCL Series.

MF Supply is a leading supplier of key-locking inserts including major brands and equivalents to Acme, Alcoa, Camloc, Clarendon, Fairchild, Kaynar, Microdot and Tridair Keenserts® in imperial, metric and mil-spec sizes and materials.

We stock a huge inventory including Miniature, Thinwall, Lightweight, Heavy Duty, Extra Heavy Duty, Locking, Non-Locking, Solid and Floating style Keenserts®. Our products are DFAR compliant with COC and full certifications available upon request.

If you cant find the part number you need feel free to request a quote and our sourcing experts can help you out!

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.

To learn more about our products, visit our blog, or email us at

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.

MF Supply Work With Us

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. 

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