MS 21045-8 Hex Nuts | McMaster-Carr

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System of Measurement

Inch

Thread Size

1/2"-20

Military Specification

Locking Type

Nut Type

Width

Finish

Performance

Heavy Vibration Resistant

Material

Steel

Height

39/64"

Certification

Mil. Spec.

Thread Fit

Unified Standard Class 3B

Thread Direction

Right Hand

Export Control Classification Number (ECCN)

EAR99

Sold As

Individual

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

Yes

DFARS Specialty Metals

REACH

RoHS

Thread Spacing

Thread Type

Hex Nut Profile

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



	1/2"-20	3/4"	39/64"	MS21045-8	1	99638A600	000000
	Mil. Spec. Flex-Top Locknut for Heavy Vibration, Cadmium Plated Steel, 1/2"-20 Thread, MS21045-8 Product Detail QuantityPack of 1In 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