Top 17 Keensert® Questions: Expert Answers to Common Questions (Part 3)
Posted: May 22, 2025 Filed under: Inch and Mil-Spec Keensert, keensert, Keenserts Frequently Asked Questions | Tags: Expert Answers to Keenserts Frequently Asked Questions, Keensert FAQs Part 3, Keensert Guide, Keensert Inserts, Keensert Materials Available, Keensert Supplier, Key Locking Inserts, Self-Locking Keensert Leave a comment
In the final installment of our Top 17 Keensert® Frequently Asked Questions series, we’re diving into some of the most advanced topics in the world of key-locking inserts. We’ll compare Keensert® style inserts with alternatives like Helical Inserts (Heli-Coils®), explore the unique advantages of floating key-locking designs, unpack the performance benefits of dry film lubrication, and explain why high-performance materials such as A286 superalloy may come with longer lead times. Our aim is to equip manufacturers with the knowledge they need to make confident, informed procurement decisions.
13. What is the difference between a Keensert® and a Heli-coil®?
Both “Heli-coil®” or helical wire inserts and “Keensert®” or key-locking inserts fall under the “Threaded Insert” category of fasteners. Both helical wire and key-locking inserts are used to repair damaged threads or to strengthen/reinforce a weaker parent material.
A key-locking insert (Keensert®) is a solid bushing style insert that is threaded on the inside and the outside with keys on the top. A helical wire insert (Heli-coil®) is a spring-like precision form wire coil that provides a permanent thread that’s stronger than the parent material.
The main differences between helical wire inserts and key-locking inserts lie in their strength, ease of installation and price.
Here are some directions on how to select the correct threaded insert for your application:
- Keenserts are the best bet in heavy wear, high vibration and high heat situations where saving space is not a concern and the hole depth is limited.
- Helical wire inserts are the way to go when reducing costs and minimizing space are priorities. Helicals are useful for creating permanent strong threads in softer materials, in lower heat and lower torque environments, or to convert threads between inch and metric sizes.
Checkout our blog, “Heli-coils” vs. “Keenserts”: 3 differences you must know-Part 1 of 2, to learn more!
14. Which Keenserts® have dry film lube?
Dry film lube is a lubricant applied to reduce friction, which is available on some Keenserts® for applications requiring reduced torque or where liquid lubricants are impractical.
Note: Self-locking Keenserts® are often treated with a dry-film lubricant that makes them easier to install and can result in a darker appearance compared to non-self-locking types.
15. What are floating Keenserts® used for?
Floating Keenserts® allow for slight misalignment in bolt holes. They’re not typically off-the-shelf due to their specialized application, often requiring a custom order with a minimum buy and a lead time.
16. Why is there such a long lead time on A286 Keenserts®?
Compared to more commonly used materials such as carbon steel and stainless steel, A286 has a limited pool of suppliers. Keenserts® made from A286 superalloy are known for their strength and corrosion resistance at high temperatures, which makes them ideal for many aerospace applications. However, due to their specialized nature, the availability of A286 Keenserts may be limited and may involve longer lead times and minimum buys compared to other more common materials. Plan accordingly.
17. What is the difference between Keysert® and Keensert®?
Keysert® and Keensert® are both brand names for key-locking inserts. Keensert® is a registered trademark of Huck Patents, Inc. & Keysert® is a registered trademark of Alcoa Fastening Systems.
You now have a comprehensive understanding of the advanced features and practical considerations that drive strategic decisions when sourcing for Keensert® style inserts. From material selection and installation nuances to balancing cost and efficiency with alternatives like Helical Inserts (Heli-Coils®), these insights empower you to make informed, strategic decisions when sourcing Keenserts® for your projects.
At MF Supply we specialize in supplying Keensert® Style Threaded Inserts to manufacturers, industry, and government, including major brands and equivalents to Acme, Alcoa, Camloc, Clarendon, Fairchild, Kaynar, Microdot, Tridair Keenserts®, Chrislynn, McMaster-Carr, Carr-Lane, Jergens, Howmet & Keyserts. Where applicable, our products are DFAR compliant with COC and full certifications available upon request.
If you have any questions, feel free to 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.
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