Steel Acorn Nuts | McMaster-Carr

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338 Products

Cap Nut Profile

Standard

The most commonly used cap nuts

307 products

High

Cover extra-long screws without cutting them

8 products

Cap Nut Profile

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Large gripping area keeps wrenches from slipping off as you tighten

14 products

Open End

Thread onto screws of any length

9 products

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.

Stainless Steel

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

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. 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—Our most corrosion-resistant cap nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

								Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Specs. Met	Pkg. Qty.		1-9	10-49	50-Up
18-8 Stainless Steel



		0-80	1/16"	3/16"	3/16"	—	1	91855A101	00000	00000	00000


		1-72	1/16"	3/16"	3/16"	—	1	91855A102	0000	0000	0000
		2-56	5/64"	3/16"	3/16"	—	1	91855A103	0000	0000	0000
		3-48	5/64"	1/4"	1/4"	—	1	91855A104	0000	0000	0000
		4-40	5/32"	1/4"	1/4"	—	10	99022A101	0000	0000	0000
		4-48	5/32"	1/4"	1/4"	—	10	91855A670	0000	0000	0000
		5-40	1/8"	5/16"	11/32"	—	1	91855A105	0000	0000	0000
		6-32	5/32"	5/16"	11/32"	—	10	91855A430	0000	0000	0000
		6-32	3/16"	5/16"	9/32"	—	10	99022A102	0000	0000	0000
		6-40	5/32"	5/16"	11/32"	—	10	91855A680	00000	00000	0000
		8-32	5/32"	5/16"	11/32"	—	10	91855A440	0000	0000	0000


		8-32	3/16"	5/16"	9/32"	—	10	99022A103	0000	0000	0000
		8-36	5/32"	5/16"	11/32"	—	10	91855A690	00000	00000	0000
		10-24	3/16"	3/8"	13/32"	—	10	91855A450	0000	0000	0000
		10-24	7/32"	3/8"	11/32"	—	10	99022A104	0000	0000	0000
		10-32	3/16"	3/8"	13/32"	—	10	91855A460	0000	0000	0000
		10-32	7/32"	3/8"	11/32"	—	10	99022A105	0000	0000	0000
		12-24	7/32"	3/8"	13/32"	—	10	91855A410	0000	0000	0000
		12-28	7/32"	3/8"	13/32"	—	1	91855A640	0000	0000	0000
		1/4"-20	7/32"	7/16"	3/8"	—	10	99022A106	00000	0000	0000
		1/4"-20	1/4"	7/16"	15/32"	—	10	91855A520	00000	0000	0000


		1/4"-20	5/16"	7/16"	19/32"	—	10	91855A360	00000	00000	0000
		1/4"-28	7/32"	7/16"	3/8"	—	10	99022A107	00000	0000	0000
		1/4"-28	1/4"	7/16"	15/32"	—	10	91855A470	00000	00000	0000
		5/16"-18	9/32"	9/16"	7/16"	—	5	99022A108	0000	0000	0000
		5/16"-18	5/16"	1/2"	17/32"	—	10	91855A540	00000	00000	00000
		5/16"-24	9/32"	9/16"	7/16"	—	5	99022A109	0000	0000	0000
		5/16"-24	5/16"	1/2"	17/32"	—	10	91855A032	00000	00000	00000
		3/8"-16	5/16"	5/8"	1/2"	—	5	99022A112	00000	00000	0000
		3/8"-16	3/8"	9/16"	5/8"	—	5	91855A550	00000	0000	0000
		3/8"-24	5/16"	5/8"	1/2"	—	5	99022A113	00000	00000	0000


		3/8"-24	3/8"	9/16"	5/8"	—	5	91855A331	00000	00000	0000
		7/16"-14	3/8"	3/4"	9/16"	—	1	99022A114	0000	0000	0000
		7/16"-14	7/16"	5/8"	11/16"	—	1	91855A560	0000	0000	0000
		7/16"-20	3/8"	3/4"	9/16"	—	1	99022A115	0000	0000	0000
		7/16"-20	7/16"	5/8"	11/16"	—	1	91855A490	0000	0000	0000
		1/2"-13	3/8"	3/4"	9/16"	—	1	99022A116	0000	0000	0000
		1/2"-13	1/2"	3/4"	13/16"	—	1	91855A480	0000	0000	0000
		1/2"-20	3/8"	3/4"	9/16"	—	1	99022A126	0000	0000	0000
		1/2"-20	1/2"	3/4"	13/16"	—	1	91855A333	0000	0000	0000
		9/16"-12	9/16"	7/8"	15/16"	—	1	91855A112	0000	0000	0000


		9/16"-18	9/16"	7/8"	15/16"	—	1	91855A113	0000	0000	0000
		5/8"-11	7/16"	15/16"	3/4"	—	1	99022A117	00000	00000	0000
		5/8"-11	5/8"	15/16"	1"	—	1	91855A420	00000	0000	0000
		5/8"-18	5/8"	15/16"	1"	—	1	91855A510	00000	0000	0000
		3/4"-10	1/2"	1 1/16"	7/8"	—	1	99022A118	00000	00000	00000
		3/4"-10	3/4"	1 1/16"	1 5/32"	—	1	91855A530	00000	00000	00000
		3/4"-16	3/4"	1 1/16"	1 5/32"	—	1	91855A114	00000	00000	00000
		7/8"-9	7/8"	1 1/4"	1 23/64"	—	1	91855A115	00000	00000	00000
		7/8"-14	7/8"	1 1/4"	1 23/64"	—	1	91855A116	00000	00000	00000
		1"-8	1"	1 7/16"	1 35/64"	—	1	91855A117	00000	00000	00000

1"-14	1"	1 7/16"	1 33/64"	—	1	91855A700	00000	00000	00000
1 1/4"-7	1 1/4"	1 13/16"	1 61/64"	—	1	91855A650	00000	00000	00000
M3 × 0.5 mm	3.8 mm	5.5 mm	6 mm	DIN 1587	10	94000A330	0000	0000	0000
M4 × 0.7 mm	5.7 mm	7 mm	8 mm	DIN 1587	25	94000A035	0000	0000	0000
M5 × 0.8 mm	4.5 mm	8 mm	10 mm	DIN 1587	25	94000A037	0000	0000	0000
M6 × 1 mm	7.7 mm	10 mm	12 mm	DIN 1587	20	94000A038	0000	0000	0000
M8 × 1.25 mm	10.7 mm	13 mm	15 mm	DIN 1587	10	94000A039	0000	0000	0000
M10 × 1.5 mm	12.7 mm	17 mm	18 mm	DIN 1587	5	94000A040	0000	0000	0000
M12 × 1.75 mm	15.7 mm	19 mm	22 mm	DIN 1587	5	94000A041	0000	0000	0000
M14 × 2 mm	17.7 mm	22 mm	25 mm	DIN 1587	1	94000A431	0000	0000	0000
M16 × 2 mm	20.6 mm	24 mm	28 mm	DIN 1587	1	94000A461	0000	0000	0000
M18 × 2.5 mm	24.6 mm	27 mm	32 mm	DIN 1587	1	94000A490	0000	0000	0000
M20 × 2.5 mm	25.6 mm	30 mm	34 mm	DIN 1587	1	94000A510	0000	0000	0000
M22 × 2.5 mm	28.6 mm	34 mm	39 mm	DIN 1587	1	94000A101	0000	0000	0000
M24 × 3 mm	30.5 mm	36 mm	42 mm	DIN 1587	1	94000A102	0000	0000	0000

Black-Oxide 18-8 Stainless Steel



		6-32	5/32"	5/16"	11/32"	—	10	91855A121	0000	0000	0000


		8-32	5/32"	5/16"	11/32"	—	10	91855A122	0000	0000	0000
		10-24	3/16"	3/8"	13/32"	—	10	91855A123	00000	00000	0000
		10-32	3/16"	3/8"	13/32"	—	10	91855A124	00000	00000	0000
		1/4"-20	1/4"	7/16"	15/32"	—	10	91855A125	00000	00000	0000
		5/16"-18	5/16"	1/2"	17/32"	—	5	91855A126	0000	0000	0000
		3/8"-16	3/8"	9/16"	5/8"	—	1	91855A127	0000	0000	0000
		1/2"-13	1/2"	3/4"	13/16"	—	1	91855A128	0000	0000	0000


		Highly Corrosion-Resistant 316 Stainless Steel



				2-56	5/64"	3/16"	3/16"	—	1	92994A101	00000	00000	0000


				4-40	5/32"	1/4"	1/4"	—	5	92994A005	00000	00000	0000
				5-40	1/8"	5/16"	11/32"	—	1	92994A128	0000	0000	0000
				6-32	5/32"	5/16"	11/32"	—	5	92994A007	00000	00000	0000
				8-32	5/32"	5/16"	11/32"	—	5	92994A009	00000	00000	0000
				10-24	3/16"	3/8"	13/32"	—	5	92994A401	00000	00000	00000
				10-32	3/16"	3/8"	13/32"	—	5	92994A402	00000	00000	00000
				12-24	7/32"	3/8"	13/32"	—	1	92994A133	0000	0000	0000
				1/4"-20	1/4"	7/16"	15/32"	—	1	92994A029	0000	0000	0000
				1/4"-28	1/4"	7/16"	15/32"	—	1	92994A329	0000	0000	0000
				5/16"-18	5/16"	1/2"	17/32"	—	1	92994A030	0000	0000	0000


				5/16"-24	5/16"	1/2"	17/32"	—	1	92994A330	0000	0000	0000
				3/8"-16	3/8"	9/16"	5/8"	—	1	92994A031	0000	0000	0000
				3/8"-24	3/8"	9/16"	5/8"	—	1	92994A331	0000	0000	0000
				7/16"-14	7/16"	5/8"	11/16"	—	1	92994A111	0000	0000	0000
				7/16"-20	7/16"	5/8"	11/16"	—	1	92994A112	0000	0000	0000
				1/2"-13	1/2"	3/4"	13/16"	—	1	92994A033	0000	0000	0000
				1/2"-20	1/2"	3/4"	13/16"	—	1	92994A034	0000	0000	0000
				9/16"-12	9/16"	7/8"	15/16"	—	1	92994A135	00000	00000	00000
				9/16"-18	9/16"	7/8"	15/16"	—	1	92994A136	00000	00000	00000
				5/8"-11	5/8"	15/16"	1"	—	1	92994A035	00000	00000	00000


				5/8"-18	5/8"	15/16"	1"	—	1	92994A113	00000	00000	00000
				3/4"-10	3/4"	1 1/16"	1 5/32"	—	1	92994A038	00000	00000	00000
				3/4"-16	3/4"	1 1/16"	1 5/32"	—	1	92994A114	00000	00000	00000
				7/8"-9	7/8"	1 1/4"	1 23/64"	—	1	92994A137	00000	00000	00000
				7/8"-14	7/8"	1 1/4"	1 23/64"	—	1	92994A138	00000	00000	00000
				1"-8	1"	1 7/16"	1 35/64"	—	1	92994A139	00000	00000	00000
				1"-12	1"	1 7/16"	1 35/64"	—	1	92994A141	00000	00000	00000
				1"-14	1"	1 7/16"	1 35/64"	—	1	92994A142	00000	00000	00000
				1 1/4"-7	1 1/4"	1 13/16"	1 61/64"	—	1	92994A143	00000	00000	00000
				1 1/4"-12	1 1/4"	1 13/16"	1 61/64"	—	1	92994A144	00000	00000	00000


				M3 × 0.5 mm	3.8 mm	5.5 mm	6 mm	DIN 1587	25	95514A101	0000	0000	0000
				M4 × 0.7 mm	5.5 mm	7 mm	8 mm	DIN 1587	25	95514A102	0000	0000	0000
				M5 × 0.8 mm	4.5 mm	8 mm	10 mm	DIN 1587	25	95514A103	0000	0000	0000
				M6 × 1 mm	8 mm	10 mm	12 mm	DIN 1587	25	95514A104	00000	00000	0000
				M8 × 1.25 mm	11 mm	13 mm	15 mm	DIN 1587	10	95514A105	0000	0000	0000
				M10 × 1.5 mm	13 mm	17 mm	18 mm	DIN 1587	10	95514A106	00000	00000	00000
M12 × 1.75 mm				16 mm	19 mm	22 mm	DIN 1587	5	95514A107	00000	00000	00000
M14 × 2 mm	18 mm			22 mm	25 mm	DIN 1587	1	95514A108	0000	0000	0000
M16 × 2 mm	21 mm			24 mm	28 mm	DIN 1587	1	95514A109	0000	0000	0000
M20 × 2.5 mm	26 mm			30 mm	34 mm	DIN 1587	1	95514A111	00000	00000	00000


M22 × 2.5 mm	29 mm			34 mm	39 mm	DIN 1587	1	95514A112	00000	00000	00000
M24 × 3 mm	31 mm			36 mm	42 mm	DIN 1587	1	95514A113	00000	00000	00000

Low-Strength Steel

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.

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

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.

Nickel-Plated Steel—This plating resists salt water and chemicals better than zinc plating and is less likely to wear off. It also has a bright, polished appearance.

Chrome-Plated Steel—The brightest, shiniest finish we offer, this plating has a mirror-like appearance that is often used in decorative applications. It resists salt water and chemicals better than zinc plating and is less likely to wear off.

								Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Specs. Met	Pkg. Qty.		1-9	10-49	50-Up
Zinc-Plated Steel



		2-56	5/32"	1/4"	1/4"	—	25	91875A101	00000	00000	00000


		3-48	5/32"	1/4"	1/4"	—	10	91875A281	0000	0000	0000
		4-40	5/32"	1/4"	1/4"	—	50	91875A105	00000	00000	00000
		4-48	5/32"	1/4"	1/4"	—	10	91875A284	0000	0000	0000
		5-40	5/32"	5/16"	11/32"	—	10	91875A321	0000	0000	0000
		6-32	5/32"	5/16"	11/32"	—	50	91875A110	00000	00000	00000
		6-40	5/32"	5/16"	11/32"	—	10	91875A469	0000	0000	0000
		8-32	5/32"	5/16"	11/32"	—	50	91875A115	00000	00000	00000
		8-36	5/32"	5/16"	11/32"	—	10	91875A710	0000	0000	0000
		10-24	3/16"	3/8"	13/32"	—	50	91875A120	00000	00000	00000
		10-32	3/16"	3/8"	13/32"	—	50	91875A125	00000	00000	00000


		1/4"-20	1/4"	7/16"	15/32"	—	25	91875A130	00000	0000	0000
		1/4"-28	1/4"	7/16"	15/32"	—	25	91875A135	00000	0000	0000
		5/16"-18	5/16"	1/2"	17/32"	—	25	91875A140	00000	00000	00000
		5/16"-24	5/16"	1/2"	17/32"	—	25	91875A145	00000	00000	00000
		3/8"-16	3/8"	9/16"	5/8"	—	25	91875A150	00000	00000	00000
		3/8"-24	3/8"	9/16"	5/8"	—	25	91875A155	00000	00000	00000
		7/16"-14	7/16"	5/8"	11/16"	—	20	91875A160	00000	00000	00000
		7/16"-20	7/16"	5/8"	11/16"	—	20	91875A165	00000	00000	00000
		1/2"-13	1/2"	3/4"	13/16"	—	10	91875A170	00000	00000	0000
		1/2"-20	1/2"	3/4"	13/16"	—	10	91875A175	00000	00000	0000


		5/8"-11	5/8"	15/16"	1"	—	5	91875A180	00000	00000	0000
		5/8"-18	5/8"	15/16"	1"	—	5	91875A185	00000	00000	0000
		3/4"-10	3/4"	1 1/16"	1 5/32"	—	1	91875A190	0000	0000	0000
		3/4"-16	3/4"	1 1/16"	1 5/32"	—	1	91875A195	0000	0000	0000
		7/8"-9	7/8"	1 1/4"	1 23/64"	—	1	91875A102	0000	0000	0000
		7/8"-14	7/8"	1 1/4"	1 23/64"	—	1	91875A103	0000	0000	0000
		1"-8	1"	1 7/16"	1 35/64"	—	1	91875A038	0000	0000	0000
		1"-14	1"	1 7/16"	1 35/64"	—	1	91875A104	0000	0000	0000
		1 1/4"-7	1 1/4"	1 13/16"	1 61/64"	—	1	91875A106	00000	00000	00000
		1 1/4"-12	1 1/4"	1 13/16"	1 61/64"	—	1	91875A107	00000	00000	00000


		M4 × 0.7 mm	5.3 mm	7 mm	8 mm	DIN 1587	50	91880A035	00000	00000	00000
		M5 × 0.8 mm	3.7 mm	8 mm	10 mm	DIN 1587	50	91880A037	00000	00000	00000
		M6 × 1 mm	7.7 mm	10 mm	12 mm	DIN 1587	50	91880A045	00000	00000	00000
		M8 × 1.25 mm	10.7 mm	13 mm	15 mm	DIN 1587	25	91880A050	00000	00000	00000
		M10 × 1.5 mm	12.7 mm	17 mm	18 mm	DIN 1587	10	91880A056	00000	0000	0000
		M12 × 1.75 mm	15.7 mm	19 mm	22 mm	DIN 1587	10	91880A060	00000	00000	00000


		Black Corrosion-Resistant-Coated Steel



				4-40	5/32"	1/4"	1/4"	—	10	98667A101	00000	00000	00000


				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


Nickel-Plated Steel



				6-32	5/32"	5/16"	1/4"	—	100	90532A100	00000	0000	0000


				8-32	5/32"	5/16"	1/4"	—	100	90532A125	00000	0000	0000
				10-24	3/16"	3/8"	5/16"	—	100	90532A150	0000	0000	0000
				10-32	3/16"	3/8"	5/16"	—	100	90532A175	00000	00000	00000
				1/4"-20	1/4"	7/16"	3/8"	—	100	90532A200	00000	00000	00000
				5/16"-18	5/16"	9/16"	15/32"	—	50	90532A225	00000	00000	00000
				3/8"-16	3/8"	5/8"	1/2"	—	25	90532A250	0000	0000	0000
				1/2"-13	1/2"	3/4"	9/16"	—	25	90532A275	00000	00000	00000
				5/8"-11	5/8"	15/16"	13/16"	—	10	90532A300	00000	00000	00000
				3/4"-10	3/4"	1 1/8"	1 1/8"	—	1	90532A325	0000	0000	0000


				Chrome-Plated Steel



						M4 × 0.7 mm	3.9 mm	7 mm	8 mm	DIN 1587	5	91982A200	00000	00000	0000


						M5 × 0.8 mm	5.6 mm	8 mm	10 mm	DIN 1587	5	91982A225	00000	00000	0000
						M6 × 1 mm	5.7 mm	10 mm	12 mm	DIN 1587	5	91982A250	00000	00000	00000
						M8 × 1.25 mm	8.2 mm	13 mm	15 mm	DIN 1587	1	91982A275	0000	0000	0000
						M10 × 1.5 mm	9.7 mm	17 mm	18 mm	DIN 1587	1	91982A300	0000	0000	0000
						M12 × 1.75 mm	12.2 mm	19 mm	22 mm	DIN 1587	1	91982A325	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.

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

								Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		1-9	10-49	50-Up
Zinc-Plated Steel



		1/4"-20	1/4"	7/16"	15/32"	SAE Grade 5	10	98858A101	00000	00000	00000


		5/16"-18	5/16"	1/2"	17/32"	SAE Grade 5	10	98858A102	00000	0000	0000
		3/8"-16	3/8"	9/16"	5/8"	SAE Grade 5	10	98858A103	00000	00000	00000
		1/2"-13	1/2"	3/4"	13/16"	SAE Grade 5	5	98858A104	00000	00000	00000
		5/8"-11	5/8"	15/16"	1"	SAE Grade 5	1	98858A105	0000	0000	0000
		3/4"-10	3/4"	1 1/8"	1 5/32"	SAE Grade 5	1	98858A106	0000	0000	0000
		7/8"-9	7/8"	1 1/4"	1 23/64"	SAE Grade 5	1	98858A291	00000	00000	00000
		1"-8	1"	1 1/2"	1 35/64"	SAE Grade 5	1	98858A107	00000	00000	00000


		Black Corrosion-Resistant-Coated Steel



				1/4"-20	1/4"	7/16"	15/32"	SAE Grade 5	1	98858A558	0000	0000	0000


				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.

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

									Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		1-9	10-49	50-Up
Zinc-Plated Steel



		1/4"-20	1/4"	7/16"	15/32"	SAE Grade 8	—	10	90100A101	000000	000000	00000


		5/16"-18	5/16"	1/2"	17/32"	SAE Grade 8	—	10	90100A102	00000	00000	00000
		3/8"-16	3/8"	9/16"	5/8"	SAE Grade 8	—	10	90100A103	00000	00000	00000
		1/2"-13	1/2"	3/4"	13/16"	SAE Grade 8	—	1	90100A104	0000	0000	0000
		5/8"-11	5/8"	15/16"	1"	SAE Grade 8	—	1	90100A105	0000	0000	0000
		3/4"-10	3/4"	1 1/8"	1 5/32"	SAE Grade 8	—	1	90100A106	0000	0000	0000
		7/8"-9	7/8"	1 1/4"	1 23/64"	SAE Grade 8	—	1	90100A108	00000	00000	00000
		1"-8	1"	1 1/2"	1 35/64"	SAE Grade 8	—	1	90100A107	00000	00000	00000
		M6 × 1 mm	5.7 mm	10 mm	12 mm	Class 10	DIN 1587	5	99164A101	00000	00000	00000
		M8 × 1.25 mm	8.2 mm	13 mm	15 mm	Class 10	DIN 1587	5	99164A102	00000	00000	00000
		M10 × 1.5 mm	9.7 mm	17 mm	18 mm	Class 10	DIN 1587	1	99164A103	0000	0000	0000


		M12 × 1.75 mm	12.2 mm	19 mm	22 mm	Class 10	DIN 1587	1	99164A104	00000	0000	0000


		Black Corrosion-Resistant-Coated Steel



				1/4"-20	1/4"	7/16"	15/32"	SAE Grade 8	—	1	90767A111	0000	0000	0000


				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

Cap Nuts with Threadlocker

These nuts not only conceal and protect protruding screw threads, they also resist loosening from mild vibration. They have a nylon patch bonded to their threads that grips screws for a tighter hold than standard cap nuts. They’re reusable a handful of times, but the patch’s holding power decreases with each use. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Stainless Steel

Image of Product. Front orientation. Contains Annotated, Border. Cap Nuts. Cap Nuts with Threadlocker.

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.

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



	10-24	3/16"	3/8"	13/32"	—	5	90421A110	000000


	10-32	3/16"	3/8"	13/32"	—	5	90421A120	00000
	12-24	7/32"	3/8"	13/32"	—	5	90421A130	00000
	1/4"-20	1/4"	7/16"	15/32"	—	5	90421A140	00000
	1/4"-28	1/4"	7/16"	15/32"	—	5	90421A150	00000
	5/16"-18	19/64"	1/2"	17/32"	—	5	90421A160	00000
	3/8"-16	3/8"	9/16"	5/8"	—	5	90421A170	00000
	3/8"-24	3/8"	9/16"	5/8"	—	5	90421A180	00000
	7/16"-14	7/16"	5/8"	45/64"	—	1	90421A190	0000
	1/2"-13	1/2"	3/4"	13/16"	—	1	90421A210	0000
	5/8"-11	5/8"	15/16"	1"	—	1	90421A220	00000


	3/4"-10	3/4"	1 1/16"	1 5/32"	—	1	90421A230	00000
	M5 × 0.8 mm	5.6 mm	8 mm	10 mm	DIN 1587	5	90428A110	00000
	M6 × 1 mm	5.7 mm	10 mm	12 mm	DIN 1587	5	90428A120	00000
	M8 × 1.25 mm	8.2 mm	13 mm	15 mm	DIN 1587	5	90428A130	00000
	M10 × 1.5 mm	9.7 mm	17 mm	18 mm	DIN 1587	1	90428A140	00000
	M12 × 1.75 mm	12.2 mm	19 mm	22 mm	DIN 1587	1	90428A150	00000


	Black-Oxide 18-8 Stainless Steel



			10-32	3/16"	3/8"	13/32"	—	5	90421A320	00000


			1/4"-20	1/4"	7/16"	15/32"	—	5	90421A340	00000


			Highly Corrosion-Resistant 316 Stainless Steel



					10-24	3/16"	3/8"	13/32"	—	5	93052A110	00000


					10-32	3/16"	3/8"	13/32"	—	5	93052A120	00000
					1/4"-20	1/4"	7/16"	15/32"	—	5	93052A130	00000
					5/16"-18	5/16"	1/2"	17/32"	—	1	93052A140	0000
					3/8"-16	3/8"	9/16"	5/8"	—	1	93052A150	0000
					1/2"-13	1/2"	3/4"	13/16"	—	1	93052A160	00000
					5/8"-11	5/8"	15/16"	1"	—	1	93052A170	00000

Nylon-Insert Cap Nuts

Get the protection of a cap nut with the vibration resistance of a locknut. These nuts not only conceal protruding screw threads, they also have a nylon insert that grips the screw to prevent loosening from moderate vibration. However, the insert may become brittle if exposed to high temperatures. Nuts are reusable a handful of times, but their holding power decreases with each use.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts 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.

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

Nylon 6/6 Cap—The nylon cap on these nuts is softer than metal, so it's less likely to scratch surrounding surfaces or parts.

	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M4 × 0.7 mm	2.3 mm	7 mm	9.6 mm	Class 6	DIN 986	245	50	90582A111	000000


	M5 × 0.8 mm	3.5 mm	8 mm	10.5 mm	Class 6	DIN 986	245	25	90582A112	0000
	M6 × 1 mm	3.9 mm	10 mm	12 mm	Class 6	DIN 986	245	25	90582A113	0000
	M8 × 1.25 mm	5.2 mm	13 mm	14 mm	Class 6	DIN 986	245	25	90582A114	00000
	M10 × 1.5 mm	6.4 mm	16 mm	18 mm	Class 6	DIN 986	245	10	90582A115	00000
	M12 × 1.75 mm	8.3 mm	18 mm	23 mm	Class 6	DIN 986	245	5	90582A116	0000
	M16 × 2 mm	11.3 mm	24 mm	28 mm	Class 6	DIN 986	245	1	90582A117	0000
	M20 × 2.5 mm	13.5 mm	30 mm	35 mm	Class 6	DIN 986	245	1	90582A118	0000


	Zinc-Plated Steel with Nylon 6/6 Cap



			8-32	9/64"	11/32"	23/64"	SAE Grade 2	—	250	25	98190A130	0000


			10-24	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	98190A150	0000
			10-32	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	98190A170	0000
			1/4"-20	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	98190A190	0000
			5/16"-18	1/4"	1/2"	1/2"	SAE Grade 2	—	250	10	98190A210	0000
			3/8"-16	21/64"	9/16"	5/8"	SAE Grade 2	—	250	25	98190A111	00000


			Steel with Nylon 6/6 Cap



					8-32	9/64"	11/32"	23/64"	SAE Grade 2	—	250	25	98190A112	0000


					10-32	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	98190A113	0000
					1/4"-20	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	98190A114	0000
					1/4"-28	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	98190A115	0000
					5/16"-24	1/4"	1/2"	1/2"	SAE Grade 2	—	250	25	98190A116	0000
					3/8"-24	21/64"	9/16"	5/8"	SAE Grade 2	—	250	25	98190A117	00000

Medium-Strength Steel

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

Nylon 6/6 Cap—The nylon cap on these nuts is softer than metal, so it's less likely to scratch surrounding surfaces or parts.

	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel with Nylon 6/6 Cap



	3/8"-24	21/64"	9/16"	5/8"	SAE Grade 5	250	10	98190A270	000000

High-Heavy-Profile Cap Nuts

20% wider and taller than standard cap nuts, these have high, flat sides so your wrench won't slip off as you tighten. They cover screws to protect the threads and to prevent damage to surrounding materials. Also known as acorn nuts, they have a smooth, rounded head to create a finished look.

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.

	Thread Dp.	Wd.	Ht.		Each
18-8 Stainless Steel



	1/4"-20	3/8"	5/8"	5/8"	92040A109	00000


	5/16"-18	3/8"	5/8"	5/8"	92040A110	0000
	3/8"-16	15/32"	3/4"	3/4"	92040A120	0000
	1/2"-13	19/32"	7/8"	15/16"	92040A130	00000
	5/8"-11	25/32"	1 1/16"	1 3/16"	92040A140	00000
	3/4"-10	29/32"	1 1/4"	1 3/8"	92040A150	00000
	7/8"-9	1 1/16"	1 7/16"	1 5/8"	92040A160	00000

Steel

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

	Thread Dp.	Wd.	Ht.		Each
Black-Oxide Steel



	1/4"-20	3/8"	5/8"	5/8"	90790A175	00000


	5/16"-18	3/8"	5/8"	5/8"	90790A185	0000
	3/8"-16	15/32"	3/4"	3/4"	90790A204	0000
	1/2"-13	19/32"	7/8"	15/16"	90790A216	0000
	5/8"-11	25/32"	1 1/16"	1 3/16"	90790A299	0000
	3/4"-10	29/32"	1 1/4"	1 3/8"	90790A417	00000
	7/8"-9	1 1/16"	1 3/8"	1 5/8"	90790A419	00000

Distorted-Thread Cap Nuts

For a stronger hold than nylon-insert cap nuts, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out in high-vibration applications, but they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. They have a smooth, rounded head that conceals and protects protruding screw threads while creating a finished look. Nuts are not reusable.

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.

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



	4-40	5/32"	1/4"	1/4"	10	90507A209	000000


	6-32	5/32"	5/16"	11/32"	10	90507A210	00000
	8-32	5/32"	5/16"	11/32"	10	90507A215	00000
	10-24	3/16"	3/8"	13/32"	10	90507A220	00000
	10-32	3/16"	3/8"	13/32"	10	90507A225	00000
	1/4"-20	1/4"	7/16"	15/32"	10	90507A230	00000
	1/4"-28	1/4"	7/16"	15/32"	10	90507A235	00000
	5/16"-18	5/16"	1/2"	17/32"	5	90507A240	00000
	5/16"-24	5/16"	1/2"	17/32"	5	90507A245	00000
	3/8"-16	3/8"	9/16"	5/8"	5	90507A250	00000
	3/8"-24	3/8"	9/16"	5/8"	5	90507A255	00000


	7/16"-14	7/16"	5/8"	11/16"	1	90507A275	0000
	7/16"-20	7/16"	5/8"	11/16"	1	90507A276	0000
	1/2"-13	1/2"	3/4"	13/16"	1	90507A033	00000
	1/2"-20	1/2"	3/4"	13/16"	1	90507A044	00000
	5/8"-11	19/32"	1"	63/64"	1	90507A260	0000
	3/4"-10	11/16"	1 1/16"	1 3/16"	1	90507A270	0000


	Highly Corrosion-Resistant 316 Stainless Steel



			8-32	5/32"	5/16"	11/32"	1	90431A110	0000


			10-24	3/16"	3/8"	13/32"	1	90431A120	0000
			10-32	3/16"	3/8"	13/32"	1	90431A130	0000
			1/4"-20	1/4"	7/16"	15/32"	1	90431A140	0000
			5/16"-18	5/16"	1/2"	17/32"	1	90431A150	0000
			3/8"-16	3/8"	9/16"	5/8"	1	90431A160	0000
			1/2"-13	1/2"	3/4"	13/16"	1	90431A170	00000

Low-Strength Steel

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

	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	6-32	5/32"	5/16"	11/32"	SAE Grade 2	50	90455A110	000000


	8-32	5/32"	5/16"	11/32"	SAE Grade 2	50	90455A120	00000
	10-24	3/16"	3/8"	13/32"	SAE Grade 2	25	90455A130	00000
	10-32	3/16"	3/8"	13/32"	SAE Grade 2	25	90455A140	00000
	1/4"-20	19/64"	7/16"	15/32"	SAE Grade 2	50	90455A160	00000
	5/16"-18	23/64"	1/2"	17/32"	SAE Grade 2	25	90455A170	00000
	3/8"-16	27/64"	9/16"	5/8"	SAE Grade 2	25	90455A180	00000
	1/2"-13	1/2"	3/4"	13/16"	SAE Grade 2	5	90455A150	00000

Sanitary Cap Nuts

With extremely smooth sides and rounded edges, these nuts are free of crevices where bacteria can grow. Use them to cover and protect exposed threads while fastening parts together. Nuts are certified by EHEDG to meet sanitary design standards. They have a Buna-N seal on the base that keeps liquid, debris, and other contaminants off the threads. The seal is made with metal and chemical additives, so you can find it with a metal detector or X-ray machine if it falls into your line. Also known as acorn nuts, these have a domed head to create a finished look.

Stainless Steel

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

Highly Corrosion-Resistant 316 Stainless Steel—Won't corrode from frequent washdowns and can stand up to the harshest cleaners and detergents.

	Thread Dp.	Wd.	Ht.	Seal Material	Certification	Food Industry Std.		Each
Highly Corrosion-Resistant 316 Stainless Steel



	1/4"-20	1/4"	7/16"	21/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A160	00000


	5/16"-18	9/32"	1/2"	25/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A170	0000
	3/8"-16	5/16"	9/16"	15/32"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A180	00000
	7/16"-14	21/64"	11/16"	33/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A190	00000
	1/2"-13	11/32"	3/4"	35/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A200	00000
	5/8"-11	7/16"	15/16"	43/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A210	00000
	M6 × 1 mm	5.5 mm	10 mm	8 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A110	00000
	M8 × 1.25 mm	6.5 mm	13 mm	10 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A120	00000
	M10 × 1.5 mm	8 mm	16 mm	12 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A130	00000
	M12 × 1.75 mm	9 mm	18 mm	14 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A140	00000
	M16 × 2 mm	10.5 mm	24 mm	17 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	97511A150	00000

Open-End Cap Nuts

The open top allows threads to stick out slightly, so you don't have to worry about picking the wrong thread depth. These nuts also engage more threads than standard nuts for a tighter hold. The smooth, curved head creates a finished look, while still partially concealing and protecting the sides of the screw from damage.

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.

	Thread Dp.	Wd.	Ht.		Each
18-8 Stainless Steel



	4-40	1/4"	5/16"	1/4"	94301A105	00000


	6-32	1/4"	5/16"	1/4"	94301A110	0000
	8-32	1/4"	3/8"	1/4"	94301A115	0000
	10-24	5/16"	7/16"	5/16"	94301A120	0000
	10-32	5/16"	7/16"	5/16"	94301A125	0000
	1/4"-20	5/16"	1/2"	5/16"	94301A130	0000
	5/16"-18	5/16"	9/16"	5/16"	94301A135	0000
	3/8"-16	3/8"	11/16"	3/8"	94301A140	0000
	1/2"-13	1/2"	3/4"	1/2"	94301A160	0000

High-Profile Cap Nuts

Three times the thread depth of standard cap nuts, these cover and protect extra-long, protruding screws, so you don't have to cut them when fastening parts together. They 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.

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.

	Thread Dp.	Wd.	Ht.		Each
18-8 Stainless Steel



	3/8"-16	3/4"	9/16"	1 1/16"	90023A101	000000


	3/8"-16	1"	9/16"	1 5/16"	90023A102	00000
	3/8"-16	1 1/4"	9/16"	1 9/16"	90023A103	00000
	1/2"-13	1"	3/4"	1 7/16"	90023A104	00000
	1/2"-13	1 1/4"	3/4"	1 3/4"	90023A105	00000
	1/2"-13	1 1/2"	3/4"	2"	90023A106	00000

Sealing Cap Nuts

Keep liquid, gas, debris, and other contaminants from seeping into or out of machinery, with no need for a separate O-ring. These nuts are often used outdoors to protect enclosures and other equipment from harsh weather. They also withstand high pressure, so they are useful for sealing pneumatic pumps and pressure valves. Also known as acorn nuts, they conceal protruding screw threads while fastening parts together and have a smooth, rounded head for a finished look.

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.

	Thread Dp.	Wd.	Ht.	Seal Material	Seal Temp. Range, ° F	Max. Pressure, psi		Each
18-8 Stainless Steel



	8-32	5/32"	5/16"	5/16"	Silicone Rubber	-80 to 400	1,200	90194A110	00000


	10-32	3/16"	3/8"	25/64"	Silicone Rubber	-80 to 400	1,200	90194A120	0000
	1/4"-20	1/4"	7/16"	15/32"	Silicone Rubber	-80 to 400	1,200	90194A130	0000
	3/8"-16	3/8"	5/8"	5/8"	Silicone Rubber	-80 to 400	1,200	90194A140	0000
	1/2"-13	1/2"	3/4"	13/16"	Silicone Rubber	-80 to 400	1,200	90194A150	0000

High-Profile Sanitary Cap Nuts

Cover and protect 4" of exposed threads in food plants and other sanitary environments with these extra-long cap nuts. They are free of crevices where bacteria can grow and have a Buna-N seal on the base to keep liquid, debris, and other contaminants off the threads. The seal is made with metal and chemical additives, so you can find it with a metal detector or X-ray machine if it falls into your line. Nuts have a smooth, rounded head to create a finished look.

Stainless Steel

304 Stainless Steel—Won't corrode from frequent washdowns and can stand up to most cleaners and detergents.

	Thread Dp.	Wd.	Ht.	Seal Material	Food Industry Std.		Each
304 Stainless Steel



	5/8"-11	29/32"	7/8"	4 5/32"	Buna-N	FDA Compliant 21 CFR 177.2600	97513A101	000000


	3/4"-10	29/32"	1"	4 5/32"	Buna-N	FDA Compliant 21 CFR 177.2600	97513A102	00000

Cap Nut Assortments

With a range of sizes on hand, you can use these assortments to conceal and protect protruding screw threads while fastening a variety of parts. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Nickel-Plated Steel—This plating resists salt water and chemicals better than zinc plating and is less likely to wear off. It also has a bright, polished appearance.

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.

	No. of Pieces	Container Type		Each
Nickel-Plated Steel



	6-32, 8-32, 10-32, 1/4"-20, 5/16"-18, 3/8"-16	200	Plastic Box	91987A300	000000


	18-8 Stainless Steel



			6-32, 8-32, 10-32, 1/4"-20, 5/16"-18, 3/8"-16	200	Plastic Box	91987A800	000000