Mil-Spec Fasteners & Military Standard Hardware

What is a Mil-Spec Fastener?

Mil-spec or MIL-STD fasteners are produced to the standard the U.S. Department of Defense uses in the production of military equipment. Critical fasteners and components used in the production, repair and maintenance of this equipment are classified as “Mil-spec” fasteners. These parts are usually designated by an AN, MS, MA, NAS or NASM prefix followed by a part number. Each of these prefixes is an abbreviation; for example: NAS stands for National Aerospace Standard and MS stands for Military Standard.

Check out our Mil-Spec Fastener Buyer's Guide!

Shop Mil-Spec, AN, MS, MA, NAS, NASM & Military Standard Fasteners from MF Supply

MF Supply stocks and sources Mil-Spec fasteners and precision hardware for manufacturers, aerospace and defense contractors, OEMs, machine shops, government suppliers and other compliance-driven buyers.

Shop by Mil-Spec product family below, search by part number, or contact our team for help sourcing a specific requirement. Available documentation varies by part and source and may include Certificate of Conformance, material certifications, lot traceability and DFARS-compliant options when required and quoted.

Why Buy from MF Supply?

MF Supply is a trusted supplier of Mil-Spec / MIL-STD fasteners to OEMs & Manufacturers.

Mil-spec or MIL-STD fasteners are produced to to the standard the U.S. Department of Defense uses in the production of military equipment. Critical fasteners and components used in the production, repair and maintenance of this equipment are classified as “Mil-spec” fasteners. These parts are usually designated by an AN, MS, NAS or NASM prefix followed by a part number. Each of these prefixes is an abbreviation: for example: NAS stands for National Aerospace Standard and MS stands for Military Standard.

We offer a comprehensive selection of Mil-Spec fasteners across many categories, including inserts, socket head cap screws, hex head cap screws, machine screws, nuts and standoffs and spacers, just to name a few. Our Mil-Spec fasteners are available with DFARs and/or full certifications where applicable.

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!

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.