Black-Corrosion Resistant Nuts

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90 Products

Hex Nuts

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

Medium-Strength Steel

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.

Black Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.

	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
Black Corrosion-Resistant-Coated Steel



	1/4"-20	7/16"	7/32"	SAE Grade 5	ASME B18.2.2	—	10	98797A029	00000


	5/16"-18	1/2"	17/64"	SAE Grade 5	ASME B18.2.2	—	10	98797A030	00000
	3/8"-16	9/16"	21/64"	SAE Grade 5	ASME B18.2.2	Material Certificate	5	98797A031	0000
	7/16"-14	11/16"	3/8"	SAE Grade 5	ASME B18.2.2	—	5	98797A330	0000
	1/2"-13	3/4"	7/16"	SAE Grade 5	ASME B18.2.2	Material Certificate	5	98797A523	0000
	9/16"-12	7/8"	31/64"	SAE Grade 5	ASME B18.2.2	—	5	98797A395	00000
	5/8"-11	15/16"	35/64"	SAE Grade 5	ASME B18.2.2	—	1	98797A535	0000
	3/4"-10	1 1/8"	41/64"	SAE Grade 5	ASME B18.2.2	Material Certificate	1	98797A855	0000
	M6 × 1 mm	10 mm	5 mm	Class 8	DIN 934	—	10	98797A321	0000
	M8 × 1.25 mm	13 mm	6.5 mm	Class 8	DIN 934	—	10	98797A322	00000
	M10 × 1.5 mm	17 mm	8 mm	Class 8	DIN 934	—	10	98797A323	00000


	M12 × 1.75 mm	19 mm	10 mm	Class 8	DIN 934	—	5	98797A324	0000

High-Strength Steel

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

Image of Specification. Front orientation. Hex Nuts. Hex Nuts.

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.

	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black Corrosion-Resistant-Coated Steel



	1/4"-20	7/16"	7/32"	SAE Grade 8	ASME B18.2.2	10	98797A121	000000


	5/16"-18	1/2"	17/64"	SAE Grade 8	ASME B18.2.2	10	98797A122	00000
	3/8"-16	9/16"	21/64"	SAE Grade 8	ASME B18.2.2	5	98797A123	0000
	1/2"-13	3/4"	7/16"	SAE Grade 8	ASME B18.2.2	5	98797A124	00000
	M6 × 1 mm	10 mm	5 mm	Class 10	DIN 934	10	98797A221	00000
	M8 × 1.25 mm	13 mm	6.5 mm	Class 10	DIN 934	10	98797A222	00000
	M10 × 1.5 mm	17 mm	8 mm	Class 10	DIN 934	10	98797A223	00000
	M12 × 1.75 mm	19 mm	10 mm	Class 10	DIN 934	5	98797A224	0000

Nylon-Insert Locknuts

Versatile yet economical, these are the most commonly used locknuts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.

Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Black-Corrosion-Resistant-Coated Steel



	M4 × 0.7 mm	7	5	Class 10	220	DIN 985	5	90237A110	000000


	M5 × 0.8 mm	8	5	Class 10	220	DIN 985	5	90237A120	00000
	M6 × 1 mm	10	6	Class 10	220	DIN 985	5	90237A130	00000
	M8 × 1.25 mm	13	8	Class 10	220	DIN 985	5	90237A140	00000
	M10 × 1.5 mm	17	10	Class 10	220	DIN 985	5	90237A150	00000
	M12 × 1.75 mm	19	12	Class 10	220	DIN 985	1	90237A160	0000
	M14 × 2 mm	22	14	Class 10	220	DIN 985	1	90237A170	0000

Medium-Strength Steel

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.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Black-Corrosion-Resistant-Coated Steel



	M4 × 0.7 mm	7	5	Class 8	220	DIN 985, ISO 10511	5	90819A111	000000


	M5 × 0.8 mm	8	5	Class 8	220	DIN 985, ISO 10511	5	90819A112	00000
	M6 × 1 mm	10	6	Class 8	220	DIN 985, ISO 10511	5	90819A113	00000
	M8 × 1.25 mm	13	8	Class 8	220	DIN 985, ISO 10511	5	90819A114	00000
	M10 × 1.5 mm	17	10	Class 8	220	DIN 985, ISO 10511	5	90819A115	00000
	M12 × 1.75 mm	19	12	Class 8	220	DIN 985, ISO 10511	1	90819A116	0000
	M14 × 2 mm	22	14	Class 8	220	DIN 985, ISO 10511	1	90819A117	0000

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.

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Black-Corrosion-Resistant-Coated Steel



	6-32	5/16"	11/64"	220	5	91333A110	00000


	8-32	11/32"	15/64"	220	5	91333A120	0000
	10-24	3/8"	15/64"	220	5	91333A130	0000
	10-32	3/8"	15/64"	220	5	91333A140	0000
	1/4"-20	7/16"	5/16"	220	5	91333A150	0000
	5/16"-18	1/2"	11/32"	220	5	91333A160	0000
	3/8"-16	9/16"	29/64"	220	5	91333A170	0000
	1/2"-13	3/4"	19/32"	220	5	91333A180	00000

Strong-Grip Clip-On Barrel Nuts

These clip-on nuts have a barrel with multiple threads for secure thread engagement. Also known as U-nuts, they squeeze both sides of thin panels for a tighter grip than J-nuts.

Corrosion-Resistant-Coated Steel—Corrosion-resistant-coated steel nuts hold up the best in wet and outdoor environments. The coating has been tested to extreme standards, including 720 hours of salt spray resistance.

	For Panel Thk., mm	Distance from Ctr. of Hole to Edge (A), mm	For Use With	Clip-On Nut Type	Pkg. Qty.		Pkg.
Corrosion-Resistant-Coated Steel



	M6 × 1 mm	0.5 to 4	13	Machine Screws	With Barrel	10	94850A193	000000

Thin-Heavy-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts and 10% wider, these fit in spaces with low clearance and handle heavier loads by distributing them over a larger area. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Low-Strength Steel

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Black-Corrosion-Resistant-Coated Steel



	1/4"-20	1/2"	9/32"	250	5	90652A810	00000


	5/16"-18	9/16"	5/16"	250	5	90652A820	0000
	3/8"-16	11/16"	13/32"	250	1	90652A830	0000
	1/2"-13	7/8"	17/32"	250	1	90652A840	0000

Nylon-Insert Flange Nuts

A nylon insert grips the screw for a stronger hold than a serrated flange, without damaging threads or marring the surface of your material. However, the insert may become brittle if exposed to high temperatures. These nuts have a flange that distributes pressure evenly across the mounting surface, so you don't need a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can reuse them a handful of times, but their holding power will decrease with each use. Also known as collar nuts.

Medium-Strength Steel

Image of Product. Front orientation. Flange Nuts. Nylon-Insert Flange Nuts.

Rated Grade 5, Grade F, or Class 8, these 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.

				Flange, mm
	Thread Size	Wd., mm	Ht., mm	Dia.	Thk.	Fastener Strength Grade/Class	Specs. Met	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Black Corrosion-Resistant-Coated Steel



		M5 × 0.8 mm	8	7.1	11.8	1	Class 8	DIN 6926	250	5	97071A101	00000


		M6 × 1 mm	10	9.1	14.2	1.1	Class 8	DIN 6926	250	5	97071A102	0000
		M8 × 1.25 mm	13	11.1	17.9	1.2	Class 8	DIN 6926	250	5	97071A103	0000
		M12 × 1.75 mm	18	16.1	26	1.8	Class 8	DIN 6926	250	5	97071A104	00000

Cap Nuts

Conceal and protect protruding screw threads while fastening parts together. These nuts help prevent damage to surrounding materials and reduce injuries. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Low-Strength Steel

Image of Product. Front orientation. Cap Nuts. Cap Nuts.

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength steel 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.

							Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Pkg. Qty.		1-9	10-49	50-Up
Black Corrosion-Resistant-Coated Steel



		4-40	5/32"	1/4"	1/4"	10	98667A101	000000	000000	000000


		6-32	5/32"	5/16"	11/32"	10	98667A110	00000	00000	00000
		8-32	5/32"	5/16"	11/32"	10	98667A130	00000	00000	00000
		10-24	3/16"	3/8"	13/32"	5	98667A150	0000	0000	0000
		10-32	3/16"	3/8"	13/32"	5	98667A190	0000	0000	0000
		1/4"-20	1/4"	7/16"	15/32"	5	98667A210	0000	0000	0000
		5/16"-18	5/16"	1/2"	17/32"	5	98667A230	00000	0000	0000
		3/8"-16	3/8"	9/16"	5/8"	1	98667A250	0000	0000	0000
		7/16"-14	7/16"	5/8"	11/16"	1	98667A601	0000	0000	0000
		1/2"-13	1/2"	3/4"	13/16"	1	98667A102	0000	0000	0000
		9/16"-12	9/16"	7/8"	15/16"	1	98667A695	0000	0000	0000


		5/8"-11	5/8"	15/16"	1"	1	98667A706	0000	0000	0000

Medium-Strength Steel

About twice as strong as low-strength steel, these Grade 5 nuts fasten most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

								Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		1-9	10-49	50-Up
Black Corrosion-Resistant-Coated Steel



		1/4"-20	1/4"	7/16"	15/32"	SAE Grade 5	1	98858A558	00000	00000	00000


		5/16"-18	5/16"	1/2"	17/32"	SAE Grade 5	1	98858A570	0000	0000	0000
		3/8"-16	3/8"	9/16"	5/8"	SAE Grade 5	1	98858A640	0000	0000	0000
		1/2"-13	1/2"	3/4"	13/16"	SAE Grade 5	1	98858A849	00000	00000	00000

High-Strength Steel

Rated Grade 8 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.

								Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		1-9	10-49	50-Up
Black Corrosion-Resistant-Coated Steel



		1/4"-20	1/4"	7/16"	15/32"	SAE Grade 8	1	90767A111	00000	00000	00000


		5/16"-18	5/16"	1/2"	17/32"	SAE Grade 8	1	90767A112	0000	0000	0000
		3/8"-16	3/8"	9/16"	5/8"	SAE Grade 8	1	90767A113	0000	0000	0000
		1/2"-13	1/2"	3/4"	13/16"	SAE Grade 8	1	90767A114	00000	00000	00000

Wing Nuts

Style 1

The easiest nuts to twist on and off by hand, these are commonly used to fasten parts that need to be frequently disassembled, such as access panels and covers. The wings give you more leverage than knurled-head nuts, so you can apply greater torque and achieve a tighter fit.

Steel

Style 1

							Pkg.
	Thread Size	Wd.	Ht.	Base Dia.	Pkg. Qty.		1-9	10-49	50-Up
Black Corrosion-Resistant-Coated Steel







				Style 1

				6-32	3/4"	3/8"	23/64"	5	98671A110	00000	00000	00000


				8-32	7/8"	1/2"	13/32"	5	98671A130	0000	0000	0000
				10-24	7/8"	1/2"	13/32"	5	98671A150	0000	0000	0000
				10-32	7/8"	1/2"	13/32"	5	98671A190	0000	0000	0000
				1/4"-20	1 1/8"	5/8"	15/32"	5	98671A210	0000	0000	0000
				5/16"-18	1 1/4"	5/8"	9/16"	5	98671A230	0000	0000	0000
				3/8"-16	1 1/2"	3/4"	5/8"	5	98671A250	0000	0000	0000

Thin-Profile Nylon-Insert Locknuts

About half the height of standard-profile locknuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Low-Strength Steel

	Wd.	Ht.	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Black-Corrosion-Resistant-Coated Steel



	6-32	5/16"	1/8"	220	5	91581A315	00000


	8-32	11/32"	11/64"	220	5	91581A325	0000
	10-24	3/8"	11/64"	220	5	91581A335	0000
	10-32	3/8"	11/64"	220	5	91581A345	0000
	1/4"-20	7/16"	13/64"	220	5	91581A355	0000
	5/16"-18	1/2"	1/4"	220	5	91581A365	0000
	3/8"-16	9/16"	17/64"	220	5	91581A375	0000
	1/2"-13	3/4"	5/16"	220	5	91581A385	0000

Retaining Caps

1050 Spring Steel

Plastic

Use these caps to hold components in place and protect shaft ends. Install these caps with a hammer or push them into place by hand.

Corrosion-Resistant Coated—Corrosion-resistant-coated finish is more corrosion resistant in wet environments than zinc-plated finish. Also known as black luster.

	OD	Ht.	Insert Material	Min. Hardness	Pkg. Qty.		Pkg.
Black Corrosion-Resistant-Coated 1050 Spring Steel



	1/4"	9/16"	7/32"	Steel	Not Rated	5	97036A010	00000


	5/16"	5/8"	1/4"	Steel	Not Rated	5	97036A020	0000
	3/8"	3/4"	9/32"	Steel	Not Rated	5	97036A030	00000
	1/2"	15/16"	21/64"	Steel	Not Rated	5	97036A040	00000