Narrow Nuts | McMaster-Carr

Filter by

System of Measurement

Thread Size

Width

Hex Nut Profile

Height

Material

Thread Direction

Nut Type

Finish

Thread Type

Specifications Met

Thread Spacing

Performance

Thread Fit

Unified Standard Class 2B

Unified Standard Class 3B

Locking Type

Lock Washer

DFARS Specialty Metals

Thread Pitch

Drive Style

RoHS

Compliant with Exemptions

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

Certification

Mil. Spec.

Fastener Strength Rating

Low

Washer Material

400 Series Stainless Steel

Washer OD

Washer Type

76 Products

About Hex Nuts

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

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


	4-40	3/16"	1/16"	Fed. Spec. FF-N-836, NAS671C4	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

Corrosion-Resistant Stainless Steel with Material Certificate

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.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	2-56	5/32"	1/16"	Fed. Spec. FF-N-836, NAS671C2	10	000000000	00000


	6-32	1/4"	3/32"	Fed. Spec. FF-N-836, NAS671C6	10	000000000	0000

Narrow-Profile Locknuts with External-Tooth Lock Washer

Since they're about 20% narrower, these locknuts fit in tight spaces where standard-profile nuts won't fit. They combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand and save on assembly time. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

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

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



	6-32	1/4"	1/8"	0.281"	100	000000000	000000


	8-32	5/16"	9/64"	0.344"	100	000000000	00000

Corrosion-Resistant Stainless Steel

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

	Wd.	Ht.	Washer OD	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	6-32	1/4"	1/8"	0.287"	100	000000000	000000