Fed. Spec. FF-N-836 Hex Nuts

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95 Products

About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

Hex Nut Profile

Standard

The most common hex nuts for fastening machinery and equipment

77 products

Thin

Fit in spaces with low clearance

12 products

Hex Nut Profile

Narrow

20% narrower than other nuts to fit in cramped spaces

6 products

Material

Steel

Your go-to for fastening most machinery and equipment

54 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	94575A110	000000


	1/4"-28	7/16"	7/32"	MS51968-2	SAE Grade 5	Fed. Spec. FF-N-836	25	94575A120	00000
	5/16"-18	1/2"	17/64"	MS51967-5	SAE Grade 5	Fed. Spec. FF-N-836	25	94575A230	00000
	5/16"-24	1/2"	17/64"	MS51968-5	SAE Grade 5	Fed. Spec. FF-N-836	25	94575A240	00000
	3/8"-16	9/16"	21/64"	MS51967-8	SAE Grade 5	Fed. Spec. FF-N-836	10	94575A350	0000
	3/8"-24	9/16"	21/64"	MS51968-8	SAE Grade 5	Fed. Spec. FF-N-836	10	94575A360	0000
	7/16"-14	11/16"	3/8"	MS51967-11	SAE Grade 5	Fed. Spec. FF-N-836	5	94575A730	0000
	7/16"-20	11/16"	3/8"	MS51968-11	SAE Grade 5	Fed. Spec. FF-N-836	10	94575A710	00000
	1/2"-13	3/4"	7/16"	MS51967-14	SAE Grade 5	Fed. Spec. FF-N-836	10	94575A470	00000
	1/2"-20	3/4"	7/16"	MS51968-14	SAE Grade 5	Fed. Spec. FF-N-836	10	94575A480	00000
	9/16"-12	7/8"	31/64"	MS51967-17	SAE Grade 5	Fed. Spec. FF-N-836	5	94575A750	00000


	5/8"-11	15/16"	35/64"	MS51967-20	SAE Grade 5	Fed. Spec. FF-N-836	5	94575A510	00000
	5/8"-18	15/16"	35/64"	MS51968-20	SAE Grade 5	Fed. Spec. FF-N-836	5	94575A520	00000
	3/4"-10	1 1/8"	41/64"	MS51967-23	SAE Grade 5	Fed. Spec. FF-N-836	1	94575A630	0000
	3/4"-16	1 1/8"	41/64"	MS51968-23	SAE Grade 5	Fed. Spec. FF-N-836	5	94575A640	00000

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	Certificate Type	Pkg. Qty.		Pkg.
Black-Oxide Steel



	1/4"-20	7/16"	7/32"	MS51967-3	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A111	00000


	1/4"-28	7/16"	7/32"	MS51968-3	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A112	0000
	5/16"-18	1/2"	17/64"	MS51967-6	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A113	0000
	5/16"-24	1/2"	17/64"	MS51968-6	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A114	0000
	3/8"-16	9/16"	21/64"	MS51967-9	SAE Grade 8	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	1	94191A115	0000
	3/8"-24	9/16"	21/64"	MS51968-9	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A116	0000
	7/16"-14	11/16"	3/8"	MS51967-12	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A117	0000
	7/16"-20	11/16"	3/8"	MS51968-12	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A118	0000
	1/2"-13	3/4"	7/16"	MS51967-15	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A119	0000
	1/2"-20	3/4"	7/16"	MS51968-15	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A120	0000
	9/16"-18	7/8"	31/64"	MS51968-18	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A121	0000


	5/8"-11	15/16"	35/64"	MS51967-21	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A122	00000
	5/8"-18	15/16"	35/64"	MS51968-21	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A123	0000
	3/4"-10	1 1/8"	41/64"	MS51967-24	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A124	00000
	3/4"-16	1 1/8"	41/64"	MS51968-24	SAE Grade 8	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	1	94191A125	00000


	Cadmium Yellow-Chromate-Plated Steel



			1/4"-20	7/16"	7/32"	MS51967-3	SAE Grade 8	Fed. Spec. FF-N-836	—	25	94191A100	00000


			1/4"-28	7/16"	7/32"	MS51968-3	SAE Grade 8	Fed. Spec. FF-N-836	—	25	94191A150	00000
			5/16"-18	1/2"	17/64"	MS51967-6	SAE Grade 8	Fed. Spec. FF-N-836	—	25	94191A200	00000
			5/16"-24	1/2"	17/64"	MS51968-6	SAE Grade 8	Fed. Spec. FF-N-836	—	25	94191A250	00000
			3/8"-16	9/16"	21/64"	MS51967-9	SAE Grade 8	Fed. Spec. FF-N-836	—	10	94191A300	0000
			3/8"-24	9/16"	21/64"	MS51968-9	SAE Grade 8	Fed. Spec. FF-N-836	—	10	94191A350	0000
			7/16"-14	11/16"	3/8"	MS51967-12	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A400	0000
			7/16"-20	11/16"	3/8"	MS51968-12	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A450	0000
			1/2"-13	3/4"	7/16"	MS51967-15	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A500	0000
			1/2"-20	3/4"	7/16"	MS51968-15	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A550	0000
			9/16"-18	7/8"	31/64"	MS51968-18	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A750	0000


			5/8"-11	15/16"	35/64"	MS51967-21	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A800	00000
			5/8"-18	15/16"	35/64"	MS51968-21	SAE Grade 8	Fed. Spec. FF-N-836	—	5	94191A600	00000
			3/4"-10	1 1/8"	41/64"	MS51967-24	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A650	0000
			3/4"-16	1 1/8"	41/64"	MS51968-24	SAE Grade 8	Fed. Spec. FF-N-836	—	1	94191A900	0000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

	Wd.	Ht.	Mil. Spec.	Specs. Met	Pkg. Qty.		Pkg.
Cadmium Yellow-Chromate-Plated Steel



	2-56	3/16"	1/16"	MS35649-222	Fed. Spec. FF-N-836	10	91813A110	000000


	4-40	1/4"	3/32"	MS35649-242	Fed. Spec. FF-N-836	50	91813A120	00000
	6-32	5/16"	7/64"	MS35649-262	Fed. Spec. FF-N-836	10	91813A130	0000
	8-32	11/32"	1/8"	MS35649-282	Fed. Spec. FF-N-836	50	91813A140	00000
	10-24	3/8"	1/8"	MS35649-202	Fed. Spec. FF-N-836	50	91813A150	00000
	10-32	3/8"	1/8"	MS35650-302	Fed. Spec. FF-N-836	50	91813A160	00000
	1/4"-20	7/16"	3/16"	MS35649-2252	Fed. Spec. FF-N-836	50	91813A170	00000
	5/16"-18	9/16"	7/32"	MS35649-2312	Fed. Spec. FF-N-836	25	91813A180	00000
	3/8"-16	5/8"	1/4"	MS35649-2382	Fed. Spec. FF-N-836	25	91813A190	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0-80	5/32"	3/64"	MS35650-314	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	5	91240A001	00000


	2-56	3/16"	1/16"	MS35649-224	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	25	91240A003	00000
	4-40	1/4"	3/32"	MS35649-244	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	25	91240A005	00000
	6-32	5/16"	7/64"	MS35649-264	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	25	91240A007	00000
	8-32	11/32"	1/8"	MS35649-284	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	91240A009	0000
	10-24	3/8"	1/8"	MS35649-204	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	10	91240A011	0000
	10-32	3/8"	1/8"	MS35650-304	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	91240A411	0000
	1/4"-20	7/16"	3/16"	MS35649-2254	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	91240A029	0000
	1/4"-20	7/16"	7/32"	MS51971-1	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	90762A112	0000
	1/4"-28	7/16"	3/16"	MS35650-3254	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	5	91240A078	0000
	1/4"-28	7/16"	7/32"	MS51972-1	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	90762A115	0000


	5/16"-18	1/2"	17/64"	MS51971-2	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	10	90762A118	0000
	5/16"-18	9/16"	7/32"	MS35649-2314	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	5	91240A030	0000
	5/16"-24	1/2"	17/64"	MS51972-2	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	5	90762A123	0000
	5/16"-24	9/16"	7/32"	MS35650-3314	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	91240A511	0000
	3/8"-16	9/16"	21/64"	MS51971-3	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	5	90762A127	0000
	3/8"-16	5/8"	1/4"	MS35649-2384	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	Material Certificate with Traceable Lot Number	5	91240A031	00000
	3/8"-24	9/16"	21/64"	MS51972-3	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	5	90762A132	0000
	3/8"-24	5/8"	1/4"	MS35650-3384	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	91240A512	0000
	1/2"-13	3/4"	7/16"	MS51971-5	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	90762A136	0000
	1/2"-20	3/4"	7/16"	MS51972-5	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	90762A139	0000


	5/8"-11	15/16"	35/64"	MS51971-7	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	90762A144	0000
	3/4"-10	1 1/8"	41/64"	MS51971-8	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	—	1	90762A147	0000

Mil. Spec. Narrow-Profile Hex Nuts

These nuts are manufactured and tested to strict U.S. military standards for material and construction. They are about 20% narrower to fit in tight spots where standard-profile nuts won't fit. Also known as small-pattern hex nuts.

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0-80	1/8"	3/64"	NAS671C0	Fed. Spec. FF-N-836	—	10	91834A106	000000


	2-56	5/32"	1/16"	NAS671C2	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	10	91834A101	0000
	4-40	3/16"	1/16"	NAS671C4	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	10	91834A102	0000
	6-32	1/4"	3/32"	NAS671C6	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	10	91834A103	0000
	8-32	5/16"	7/64"	NAS671C8	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	10	91834A104	0000
	10-32	11/32"	1/8"	NAS671C10	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	5	91834A105	00000

Mil. Spec. Thin-Profile Hex Nuts

These nuts are manufactured and tested to strict U.S. military standards for material and construction. About half the height of standard-profile nuts, they fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	7/16"	5/32"	MS35691-3	Fed. Spec. FF-N-836	—	5	92101A210	000000


	1/4"-28	7/16"	5/32"	MS35691-7	Fed. Spec. FF-N-836	—	1	92101A320	0000
	5/16"-18	1/2"	3/16"	MS35691-11	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	5	92101A430	00000
	5/16"-24	1/2"	3/16"	MS35691-15	Fed. Spec. FF-N-836	—	5	92101A540	00000
	3/8"-16	9/16"	7/32"	MS35691-19	Fed. Spec. FF-N-836	—	1	92101A650	0000
	3/8"-24	9/16"	7/32"	MS35691-23	Fed. Spec. FF-N-836	—	1	92101A760	0000
	7/16"-14	11/16"	1/4"	MS35691-27	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	1	92101A101	00000
	7/16"-20	11/16"	1/4"	MS35691-31	Fed. Spec. FF-N-836	—	1	92101A102	0000
	1/2"-13	3/4"	5/16"	MS35691-35	Fed. Spec. FF-N-836	Material Certificate with Traceable Lot Number	1	92101A870	0000
	1/2"-20	3/4"	5/16"	MS35691-39	Fed. Spec. FF-N-836	—	1	92101A980	0000
	5/8"-11	15/16"	3/8"	MS35691-51	Fed. Spec. FF-N-836	—	1	92101A103	00000


	5/8"-18	15/16"	3/8"	MS35691-55	Fed. Spec. FF-N-836	—	1	92101A104	00000