Small-Pattern Nuts | McMaster-Carr

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Material

Hex Nut Profile

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Performance

Highly Corrosion Resistant

Specifications Met

Fed. Spec. FF-N-836

NAS

Thread Fit

Metric Class 6H

Unified Standard Class 2B

Unified Standard Class 3B

DFARS Specialty Metals

RoHS

Compliant with Exemptions

REACH

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Export Control Classification Number (ECCN)

EAR99

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84 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

11 products

Narrow

20% narrower than other nuts to fit in cramped spaces

73 products

Performance

Corrosion Resistant

Won't rust in wet and outdoor environments

69 products

Certification

Mil. Spec.

Meet strict U.S. military standards for material and construction

6 products

Narrow-Profile Hex Nuts

When you have limited space for tightening with a wrench, use these nuts. Since they’re about 20% narrower, they fit in tight spots where standard-profile nuts won't fit. Also known as small-pattern hex nuts.

Steel

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

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.

Steel—Best for dry environments since moisture will cause these nuts to rust.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	4-40	3/16"	1/16"	100	000000000	00000


	5-40	1/4"	3/32"	100	000000000	0000
	6-32	1/4"	3/32"	100	000000000	0000
	8-32	1/4"	3/32"	100	000000000	0000
	8-32	5/16"	7/64"	100	000000000	0000
	10-24	1/4"	3/32"	50	000000000	0000
	10-24	5/16"	7/64"	100	000000000	0000
	10-32	1/4"	3/32"	100	000000000	0000
	10-32	5/16"	7/64"	100	000000000	0000


	Black-Oxide Steel



			4-40	3/16"	1/16"	100	000000000	0000


			6-32	1/4"	3/32"	100	000000000	0000
			8-32	1/4"	3/32"	100	000000000	0000
			10-24	5/16"	7/64"	100	000000000	0000
			10-32	5/16"	7/64"	100	000000000	0000


			Steel



					4-40	3/16"	1/16"	100	000000000	0000

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.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

Highly-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these nuts won't degrade when exposed to harsh weather, salt water, and most chemicals.

Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. Even if the coating wears off, these nuts will hold up in just about any environment, including salt water and most chemicals.

	Thread Size	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		0-80	1/8"	3/64"	50	000000000	00000


		1-64	1/8"	3/64"	50	000000000	0000
		1-72	7/64"	1/16"	5	000000000	00000
		2-56	5/32"	1/16"	100	000000000	0000
		4-40	3/16"	1/16"	100	000000000	0000
		5-40	1/4"	3/32"	100	000000000	0000
		6-32	1/4"	3/32"	100	000000000	0000
		8-32	1/4"	3/32"	100	000000000	0000
		8-32	5/16"	7/64"	100	000000000	0000
		10-24	5/16"	7/64"	100	000000000	0000
		10-24	11/32"	1/8"	100	000000000	00000


		10-32	5/16"	7/64"	100	000000000	0000
		10-32	11/32"	1/8"	100	000000000	00000


		Black-Oxide 18-8 Stainless Steel



				0-80	1/8"	3/64"	50	000000000	0000


				4-40	3/16"	1/16"	100	000000000	0000
				6-32	1/4"	3/32"	100	000000000	00000
				8-32	1/4"	3/32"	100	000000000	00000
				8-32	5/16"	7/64"	100	000000000	00000
				10-24	5/16"	7/64"	100	000000000	00000
				10-32	5/16"	7/64"	100	000000000	00000


				Highly-Corrosion-Resistant 316 Stainless Steel



						4-40	3/16"	1/16"	1	000000000	0000


						5-40	1/4"	3/32"	1	000000000	0000
						6-32	1/4"	3/32"	1	000000000	0000
						8-32	1/4"	3/32"	50	000000000	00000
						8-32	5/16"	7/64"	1	000000000	0000
						10-24	1/4"	3/32"	1	000000000	0000
						10-24	5/16"	7/64"	50	000000000	00000
						10-24	11/32"	1/8"	1	000000000	0000
						10-32	5/16"	7/64"	50	000000000	00000
						10-32	11/32"	1/8"	1	000000000	0000
						M3.5 × 0.6 mm	5.5 mm	2.5 mm	1	000000000	0000


						M4 × 0.7 mm	5.5 mm	2.5 mm	1	000000000	0000
						M4 × 0.7 mm	7 mm	2.9 mm	1	000000000	0000
						M5 × 0.8 mm	7 mm	2.5 mm	1	000000000	0000


						Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel



M4 × 0.7 mm	5.5 mm							2.5 mm	1	000000000	0000


M5 × 0.8 mm	7 mm							2.5 mm	1	000000000	0000

Corrosion-Resistant Stainless Steel with Material Certificate

Highly-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these nuts won't degrade when exposed to harsh weather, salt water, and most chemicals.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Highly-Corrosion-Resistant 316 Stainless Steel



	10-32	1/4"	3/32"	1	000000000	00000


	M3 × 0.5 mm	5 mm	1.7 mm	1	000000000	0000
	M5 × 0.8 mm	7.5 mm	2.9 mm	1	000000000	0000


	Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel



			M3 × 0.5 mm	5 mm	1.7 mm	1	000000000	0000


			M4 × 0.7 mm	7 mm	2.9 mm	1	000000000	0000

Brass

Brass—Conductive and nonmagnetic, brass nuts are commonly used to secure electrical equipment, such as circuit board assemblies and mounting brackets, inside enclosures. They're also softer than most metals, so they won't damage other fastening components.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Brass



	0-80	3/32"	3/64"	10	000000000	000000


	1-72	7/64"	1/16"	10	000000000	00000
	2-56	1/8"	5/64"	10	000000000	00000
	2-56	5/32"	1/16"	100	000000000	0000
	4-40	3/16"	1/16"	100	000000000	0000
	6-32	1/4"	3/32"	100	000000000	0000
	8-32	1/4"	3/32"	100	000000000	0000
	8-32	5/16"	7/64"	100	000000000	0000
	10-24	5/16"	7/64"	100	000000000	0000
	10-24	11/32"	1/8"	100	000000000	00000
	10-32	5/16"	7/64"	100	000000000	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.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0-80	1/8"	3/64"	Fed. Spec. FF-N-836, NAS671C0	10	000000000	000000


	2-56	5/32"	1/16"	Fed. Spec. FF-N-836, NAS671C2	10	000000000	0000
	4-40	3/16"	1/16"	Fed. Spec. FF-N-836, NAS671C4	10	000000000	0000
	6-32	1/4"	3/32"	Fed. Spec. FF-N-836, NAS671C6	10	000000000	0000
	8-32	5/16"	7/64"	Fed. Spec. FF-N-836, NAS671C8	10	000000000	0000
	10-32	11/32"	1/8"	Fed. Spec. FF-N-836, NAS671C10	5	000000000	00000

Hex Nuts

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

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.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0000-160	1/16"	1/32"	1	000000000	000000


	000-120	5/64"	1/32"	5	000000000	00000
	00-90	5/64"	3/64"	5	000000000	00000
	1/4"-20	7/16"	3/16"	100	000000000	0000
	1/4"-28	7/16"	3/16"	100	000000000	00000
	5/16"-18	9/16"	7/32"	50	000000000	0000
	3/8"-16	5/8"	1/4"	25	000000000	0000

Brass

	Wd.	Ht.	Pkg. Qty.		Pkg.
Brass



	000-120	5/64"	1/32"	10	000000000	000000


	00-90	5/64"	3/64"	10	000000000	00000
	00-96	5/64"	3/64"	1	000000000	0000
	1/4"-20	7/16"	3/16"	50	000000000	00000