MS 21045-4 Hex Nuts | McMaster-Carr

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1/4"-28

Locking Type

Flex-Top

Military Specification

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Unified Standard Class 3B

Performance

Heavy Vibration Resistant

Hex Nut Profile

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

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1 Product

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

These locknuts are manufactured and tested to strict U.S. military standards for material and construction. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Cadmium-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.

	Wd.	Ht.	Mil. Spec.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel



	1/4"-28	7/16"	5/16"	MS21045-4	5	000000000	000000
	Mil. Spec. Flex-Top Locknut for Heavy Vibration, Cadmium Plated Steel, 1/4"-28 Thread, MS21045-4 Product Detail QuantityPack of 5In stock Select a compatible file type: Parasolid Solidworks 2022 and Parasolid files now available Solidworks 2022, PDF, and DWG files now available Parasolid files now available Compatible Products for This Locknut

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

Compatible Products for This Locknut