MS 51967 Hex Nuts | McMaster-Carr

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Military Specification

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SAE Grade 5

SAE Grade 8

Finish

Black Oxide

Cadmium Yellow-Chromate Plated

Material

Hex Nut Profile

Nut Type

Thread Direction

Specifications Met

Width

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Fastener Strength Rating

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High

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Unified Standard Class 2B

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Mil. Spec.

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22 Products

Mil. Spec. Hex Nuts

These nuts are manufactured and tested to strict U.S. military standards for material and construction.

Medium-Strength Steel

Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex Nuts.

These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Cadmium Yellow-Chromate-Plated Steel— The plating creates a barrier against rust, so these nuts are suitable for most wet and outdoor environments. They also thread on smoothly without sticking.

	Wd.	Ht.	Mil. Spec.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Cadmium Yellow-Chromate-Plated Steel


	1/4"-20	7/16"	7/32"	MS51967-2	SAE Grade 5	Fed. Spec. FF-N-836	25	000000000	000000
	5/16"-18	1/2"	17/64"	MS51967-5	SAE Grade 5	Fed. Spec. FF-N-836	25	000000000	00000
	3/8"-16	9/16"	21/64"	MS51967-8	SAE Grade 5	Fed. Spec. FF-N-836	10	000000000	0000
	7/16"-14	11/16"	3/8"	MS51967-11	SAE Grade 5	Fed. Spec. FF-N-836	5	000000000	0000
	1/2"-13	3/4"	7/16"	MS51967-14	SAE Grade 5	Fed. Spec. FF-N-836	10	000000000	00000
	9/16"-12	7/8"	31/64"	MS51967-17	SAE Grade 5	Fed. Spec. FF-N-836	5	000000000	00000
	5/8"-11	15/16"	35/64"	MS51967-20	SAE Grade 5	Fed. Spec. FF-N-836	5	000000000	00000
	3/4"-10	1 1/8"	41/64"	MS51967-23	SAE Grade 5	Fed. Spec. FF-N-836	1	000000000	0000

High-Strength Steel

Rated Grade 8, Grade C, or Class 10, these nuts are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, motors, and other high-stress applications. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

	Wd.	Ht.	Mil. Spec.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel


	1/4"-20	7/16"	7/32"	MS51967-3	SAE Grade 8	Fed. Spec. FF-N-836	5	000000000	00000
	5/16"-18	1/2"	17/64"	MS51967-6	SAE Grade 8	Fed. Spec. FF-N-836	5	000000000	0000
	3/8"-16	9/16"	21/64"	MS51967-9	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	0000
	7/16"-14	11/16"	3/8"	MS51967-12	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	0000
	1/2"-13	3/4"	7/16"	MS51967-15	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	0000
	5/8"-11	15/16"	35/64"	MS51967-21	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	00000
	3/4"-10	1 1/8"	41/64"	MS51967-24	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	00000

	Cadmium Yellow-Chromate-Plated Steel


			1/4"-20	7/16"	7/32"	MS51967-3	SAE Grade 8	Fed. Spec. FF-N-836	25	000000000	00000
			5/16"-18	1/2"	17/64"	MS51967-6	SAE Grade 8	Fed. Spec. FF-N-836	25	000000000	00000
			3/8"-16	9/16"	21/64"	MS51967-9	SAE Grade 8	Fed. Spec. FF-N-836	10	000000000	0000
			7/16"-14	11/16"	3/8"	MS51967-12	SAE Grade 8	Fed. Spec. FF-N-836	5	000000000	0000
			1/2"-13	3/4"	7/16"	MS51967-15	SAE Grade 8	Fed. Spec. FF-N-836	5	000000000	0000
			5/8"-11	15/16"	35/64"	MS51967-21	SAE Grade 8	Fed. Spec. FF-N-836	5	000000000	00000
			3/4"-10	1 1/8"	41/64"	MS51967-24	SAE Grade 8	Fed. Spec. FF-N-836	1	000000000	0000