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Inch & Mil-Spec Keensert® Style Threaded Inserts
MS51830 | MS51831 | MS51832

Select your product category, search our cross reference tables, or search our site by description or part number to Request a quote or buy online now.

Why Buy from MF Supply?

MF Supply is a leading supplier of Inch & Mil-Spec keylocking inserts including major brands and equivalents to Acme, Alcoa, Camloc, Clarendon, Fairchild, Kaynar, Microdot and Tridair Keenserts® & Keyserts. Our products are DFAR compliant with COC and full certifications available upon request.

We stock a huge inventory including Lightweight, Miniature & Thinwall / MS51830 & MS51831 Series, Heavy Duty & Thickwall / MS51831 Series, Extra Heavy Duty / MS51832 Series in Locking and Non-Locking styles. Standard materials offered include Stainless Steel, A286, Nitronic 60, 4140 Alloy and Carbon Steel. Standard sizes run from M2 through M24.

Additional Inch product lines include Solid inserts & Mil-Spec keylocking inserts, installation tools and kits. Special materials and nonstandard sizes may be available for special order with a lead time.

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!

Fastener & Electronic Hardware Specialists


Trademark Notice & Disclaimer

KEENSERTS® is a registered trademark of Huck Patents, Inc. and Howmet Aerospace Inc. MF Supply is an independent distributor not affiliated with or endorsed by the trademark owners. Any reference to KEENSERTS® is strictly for descriptive compatibility and cross-referencing. Unless explicitly noted, products offered are functionally equivalent alternatives, not original KEENSERTS® brand inserts.