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Keensert® Style Key-Locking Inserts
Cross-Reference: Inch, Mil-Spec & Metric


At MF Supply, we specialize in sourcing hard-to-find, backordered, costly, or out-of-stock OEM hardware—helping customers reduce lead times and lower costs without compromising quality.

One of our special skills is providing functional equivalents to expensive brand name key-locking inserts (also known in the industry as Keenserts®, keylocking inserts or key locking inserts) including: Acme, Alcoa, Boeing, Carr-Lane, Camloc, Chrislynn, Clarendon, Delron, Fairchild, Howmet, Huck, Jergens, Kaynar, McMaster-Carr, Microdot, Rexnord, Rosan, SPS Technologies, Tridair Keensert® and Keysert® style inserts. Available in inch/imperial, Mil-Spec, and metric sizes, and in a wide range of styles, options, and materials.


Use our cross-reference tables below to find equivalents for Keensert®, Keysert® and Mil-Spec parts, such as MS51830, MS51831, NAS1395, and more!

Why Buy Keensert® Style Key-Locking Inserts from MF Supply?

With over 50 years of experience as a trusted supply chain partner to manufacturers, government, and industry, MF Supply offers deep and broad expertise in fasteners and inserts to support all your hardware and fastening needs. We stock and source a wide inventory of Keensert® style key-locking inserts covering all styles, series, options, and materials listed below.

Styles/Series:

    • Commercial Inch & Metric Series: Miniature (KNC & KNCM), Thin Wall (RKKA, KN & KNM), Heavy Duty (RKK, KNH & KNHM), Thick Wall (RKK, KNH, KNHM & KNKD), Extra Heavy Duty (KNHXH), Solid (KNJ), and Floating (KNK & KNKD).
    • Mil-Spec Series: MS51830, MS51831, MS51832, NA0146, NA0147, NA0148, NA0149, NA0150, and NA0151.

Options:

    • Self-Locking and Non-Locking.

Materials:

    • 303 CRES Stainless Steel, 4140 Alloy, A286 Stainless, Carbon Steel (Black-Phosphate) and Nitronic 60.

Our Mil-Spec and certified Keensert® style key-locking inserts are DFAR compliant and come with the manufacturer’s Certificate of Conformance (COC). Full physical and chemical certifications are available upon request.

Can't find what you're looking for? Email us at [email protected] for a custom quote. "We have the right screw for you" is our motto after all!