MS 15795 Washers | McMaster-Carr

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NASM15795

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149 Products

Mil. Spec. Washers

These washers are manufactured and tested to strict U.S. military standards for material and construction. They take the pressure off screws and nuts to protect mounting surfaces.

Stainless Steel About Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers 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 washers have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to harsh chemicals as well as 316 stainless steel.

Material Certificate—Washers include a report with a traceable lot number.

	For Screw Size	ID	OD	Thk.	Mil. Spec.	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		No. 1	0.078"	0.188"	0.016" to 0.025"	MS15795-801, NASM15795	—	—	500	98019A395	000000


		No. 2	0.094"	0.250"	0.016" to 0.025"	MS15795-802, NASM15795	ASME B18.21.1	Material Certificate	500	98019A300	00000
		No. 4	0.125"	0.250"	0.017" to 0.028"	MS15795-803, NASM15795	—	Material Certificate	500	98019A309	00000
		No. 4	0.125"	0.312"	0.025" to 0.040"	MS15795-804, NASM15795	ASME B18.21.1	Material Certificate	500	98019A310	00000
		No. 6	0.156"	0.312"	0.027" to 0.048"	MS15795-805, NASM15795	—	—	250	98019A314	00000
		No. 6	0.156"	0.375"	0.036" to 0.065"	MS15795-806, NASM15795	ASME B18.21.1	Material Certificate	250	98019A315	00000
		No. 8	0.188"	0.375"	0.036" to 0.065"	MS15795-807, NASM15795	—	Material Certificate	250	98019A325	00000
		No. 8	0.188"	0.438"	0.036" to 0.065"	MS15795-841, NASM15795	ASME B18.21.1	Material Certificate	125	98019A326	00000
		No. 10	0.219"	0.438"	0.036" to 0.065"	MS15795-808, NASM15795	—	Material Certificate	250	98019A330	00000
		No. 10	0.219"	0.500"	0.036" to 0.065"	MS15795-842, NASM15795	ASME B18.21.1	Material Certificate	100	98019A333	00000
		No. 12	0.250"	0.562"	0.051" to 0.080"	MS15795-809, NASM15795	ASME B18.21.1	Material Certificate	100	98019A335	00000


		1/4"	0.281"	0.625"	0.051" to 0.080"	MS15795-810, NASM15795	ASME B18.21.1	Material Certificate	50	98019A355	00000
		1/4"	0.312"	0.734"	0.051" to 0.080"	MS15795-811, NASM15795	ASME B18.21.1	Material Certificate	25	98019A360	00000
		5/16"	0.344"	0.688"	0.051" to 0.080"	MS15795-812, NASM15795	ASME B18.21.1	Material Certificate	25	98019A385	0000
		5/16"	0.375"	0.875"	0.064" to 0.104"	MS15795-813, NASM15795	—	Material Certificate	25	98019A390	00000
		3/8"	0.406"	0.812"	0.051" to 0.080"	MS15795-814, NASM15795	ASME B18.21.1	Material Certificate	50	98019A399	00000
		3/8"	0.438"	1.000"	0.064" to 0.104"	MS15795-815, NASM15795	ASME B18.21.1	Material Certificate	10	98019A500	0000
		7/16"	0.469"	0.922"	0.051" to 0.080"	MS15795-816, NASM15795	ASME B18.21.1	—	25	98019A502	00000
		7/16"	0.500"	1.250"	0.064" to 0.104"	MS15795-817, NASM15795	ASME B18.21.1	—	10	98019A505	00000
		1/2"	0.531"	1.062"	0.074" to 0.121"	MS15795-818, NASM15795	ASME B18.21.1	Material Certificate	10	98019A509	00000
		1/2"	0.562"	1.375"	0.086" to 0.132"	MS15795-819, NASM15795	ASME B18.21.1	Material Certificate	10	98019A510	00000


		5/8"	0.656"	1.312"	0.074" to 0.121"	MS15795-820, NASM15795	ASME B18.21.1	Material Certificate	10	98019A514	00000
		5/8"	0.688"	1.750"	0.108" to 0.160"	MS15795-821, NASM15795	ASME B18.21.1	—	5	98019A515	00000
		3/4"	0.812"	1.469"	0.108" to 0.160"	MS15795-822, NASM15795	ASME B18.21.1	Material Certificate	5	98019A519	00000
		3/4"	0.812"	2.000"	0.122" to 0.177"	MS15795-823, NASM15795	ASME B18.21.1	Material Certificate	5	98019A520	00000
		7/8"	0.938"	1.750"	0.108" to 0.160"	MS15795-824, NASM15795	ASME B18.21.1	Material Certificate	5	98019A524	00000
		7/8"	0.938"	2.250"	0.136" to 0.192"	MS15795-825, NASM15795	ASME B18.21.1	—	1	98019A525	0000
		1"	1.062"	2.000"	0.108" to 0.160"	MS15795-826, NASM15795	ASME B18.21.1	—	1	98019A529	0000
		1"	1.062"	2.500"	0.136" to 0.192"	MS15795-827, NASM15795	ASME B18.21.1	—	1	98019A530	0000


		Black-Oxide 18-8 Stainless Steel



				No. 1	0.078"	0.188"	0.016" to 0.025"	MS15795-801B, NASM15795	—	—	100	90618A111	00000


				No. 2	0.094"	0.218"	0.018" to 0.022"	MS15795-844B, NASM15795	—	—	100	90618A113	00000
				No. 2	0.094"	0.250"	0.016" to 0.025"	MS15795-802B, NASM15795	ASME B18.21.1	—	100	90618A112	00000
				No. 4	0.125"	0.250"	0.017" to 0.028"	MS15795-803B, NASM15795	—	—	100	90618A200	0000
				No. 4	0.125"	0.312"	0.025" to 0.040"	MS15795-804B, NASM15795	ASME B18.21.1	—	100	90618A114	00000
				No. 6	0.156"	0.312"	0.027" to 0.048"	MS15795-805B, NASM15795	—	—	100	90618A300	0000
				No. 6	0.156"	0.375"	0.036" to 0.065"	MS15795-806B, NASM15795	ASME B18.21.1	—	100	90618A115	00000
				No. 6	0.172"	0.281"	0.029" to 0.039"	MS15795-845B, NASM15795	—	—	100	90618A116	00000
				No. 6	0.172"	0.312"	0.029" to 0.039"	MS15795-856B, NASM15795	—	—	100	90618A117	00000
				No. 8	0.188"	0.375"	0.036" to 0.065"	MS15795-807B, NASM15795	—	—	100	90618A400	00000
				No. 8	0.188"	0.438"	0.036" to 0.065"	MS15795-841B, NASM15795	ASME B18.21.1	—	100	90618A118	00000


				No. 10	0.203"	0.375"	0.019" to 0.021"	MS15795-846B, NASM15795	—	Material Certificate	100	90618A119	00000
				No. 10	0.203"	0.562"	0.029" to 0.035"	MS15795-847B, NASM15795	—	—	100	90618A122	00000
				No. 10	0.203"	0.562"	0.057" to 0.069"	MS15795-848B, NASM15795	—	Material Certificate	50	90618A123	00000
				No. 10	0.203"	0.625"	0.035" to 0.045"	MS15795-849B, NASM15795	—	Material Certificate	50	90618A124	0000
				No. 10	0.203"	0.734"	0.025" to 0.045"	MS15795-857B, NASM15795	—	—	50	90618A125	00000
No. 10				0.203"	1.062"	0.017" to 0.023"	MS15795-850B, NASM15795	—	—	10	90618A126	00000
No. 10	0.219"			0.438"	0.036" to 0.065"	MS15795-808B, NASM15795	—	—	100	90618A500	00000
No. 10	0.219"			0.500"	0.036" to 0.065"	MS15795-842B, NASM15795	ASME B18.21.1	—	100	90618A121	00000
1/4"	0.250"			0.562"	0.051" to 0.080"	MS15795-809B, NASM15795	—	Material Certificate	100	90618A129	00000
1/4"	0.250"			0.688"	0.065" to 0.075"	MS15795-851B, NASM15795	—	—	25	90618A132	00000


1/4"	0.266"			0.458"	0.028" to 0.046"	MS15795-858B, NASM15795	—	Material Certificate	100	90618A128	00000
1/4"	0.266"			0.625"	0.026" to 0.036"	MS15795-852B, NASM15795	—	Material Certificate	100	90618A131	00000
1/4"	0.266"			0.688"	0.046" to 0.054"	MS15795-853B, NASM15795	—	—	50	90618A133	00000
1/4"	0.281"			0.625"	0.051" to 0.080"	MS15795-810B, NASM15795	ASME B18.21.1	—	50	90618A600	00000
1/4"	0.296"			0.438"	0.029" to 0.035"	MS15795-854B, NASM15795	—	Material Certificate	100	90618A127	00000
5/16"	0.312"			0.734"	0.051" to 0.080"	MS15795-811B, NASM15795	—	—	50	90618A134	00000
5/16"	0.344"			0.688"	0.051" to 0.080"	MS15795-812B, NASM15795	ASME B18.21.1	—	50	90618A700	00000
3/8"	0.375"			0.875"	0.064" to 0.104"	MS15795-813B, NASM15795	—	—	25	90618A135	00000
3/8"	0.406"			0.812"	0.051" to 0.080"	MS15795-814B, NASM15795	ASME B18.21.1	—	50	90618A800	00000
7/16"	0.438"			1.000"	0.064" to 0.104"	MS15795-815B, NASM15795	—	—	25	90618A136	00000


7/16"	0.469"			0.922"	0.051" to 0.080"	MS15795-816B, NASM15795	ASME B18.21.1	—	25	90618A137	00000
1/2"	0.500"			1.250"	0.064" to 0.104"	MS15795-817B, NASM15795	—	Material Certificate	10	90618A138	00000
1/2"	0.531"			1.062"	0.074" to 0.121"	MS15795-818B, NASM15795	ASME B18.21.1	—	10	90618A900	00000
1/2"	0.531"			1.250"	0.090" to 0.112"	MS15795-855B, NASM15795	—	—	10	90618A139	00000
1/2"	0.562"			1.375"	0.086" to 0.132"	MS15795-819B, NASM15795	ASME B18.21.1	—	5	90618A141	00000
9/16"	0.594"			1.469"	0.090" to 0.112"	MS15795-843B, NASM15795	—	—	5	90618A142	00000
5/8"	0.656"			1.312"	0.074" to 0.121"	MS15795-820B, NASM15795	ASME B18.21.1	—	5	90618A143	00000
3/4"	0.812"			1.469"	0.108" to 0.160"	MS15795-822B, NASM15795	ASME B18.21.1	—	5	90618A144	00000
3/4"	0.812"			2.000"	0.122" to 0.177"	MS15795-823B, NASM15795	ASME B18.21.1	—	5	90618A145	00000
7/8"	0.938"			1.750"	0.108" to 0.160"	MS15795-824B, NASM15795	ASME B18.21.1	—	5	90618A146	00000


7/8"	0.938"			2.250"	0.136" to 0.192"	MS15795-825B, NASM15795	ASME B18.21.1	—	1	90618A147	0000
1"	1.062"			2.000"	0.108" to 0.160"	MS15795-826B, NASM15795	ASME B18.21.1	—	1	90618A148	0000
1"	1.062"			2.500"	0.136" to 0.192"	MS15795-827B, NASM15795	ASME B18.21.1	—	1	90618A149	0000
1 1/8"	1.250"			2.750"	0.136" to 0.192"	MS15795-828B, NASM15795	ASME B18.21.1	—	1	90618A151	00000

Brass

Softer than most metals, brass washers won't damage other fastening components.

Black-Oxide Brass—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to salt water and harsh chemicals.

Material Certificate—Washers include a report with a traceable lot number.

	ID	OD	Thk.	Mil. Spec.	Certificate Type	Pkg. Qty.		Pkg.
Black-Oxide Brass



	No. 2	0.094"	0.250"	0.016" to 0.025"	MS15795-902	—	10	98102A112	00000


	No. 4	0.125"	0.250"	0.017" to 0.028"	MS15795-903	—	10	98102A113	0000
	No. 4	0.125"	0.312"	0.025" to 0.040"	MS15795-904	—	10	98102A114	00000
	No. 5	0.141"	0.312"	0.024" to 0.032"	MS15795-944	—	10	98102A115	00000
	No. 6	0.156"	0.312"	0.027" to 0.048"	MS15795-905	—	10	98102A117	00000
	No. 6	0.156"	0.375"	0.036" to 0.065"	MS15795-906	—	10	98102A118	00000
	No. 8	0.188"	0.375"	0.036" to 0.065"	MS15795-907	—	10	98102A119	00000
	No. 8	0.188"	0.438"	0.036" to 0.065"	MS15795-941	—	10	98102A121	00000
	No. 10	0.203"	0.406"	0.036" to 0.045"	MS15795-946	—	10	98102A122	00000
	No. 10	0.219"	0.438"	0.036" to 0.065"	MS15795-908	—	10	98102A123	00000
	No. 10	0.219"	0.469"	0.036" to 0.065"	MS15795-947	—	10	98102A124	00000


	No. 12	0.250"	0.438"	0.013" to 0.020"	MS15795-948	—	10	98102A126	00000
	No. 12	0.250"	0.500"	0.036" to 0.065"	MS15795-949	—	10	98102A127	00000
	No. 12	0.250"	0.562"	0.051" to 0.080"	MS15795-909	—	10	98102A128	00000
	1/4"	0.281"	0.625"	0.051" to 0.080"	MS15795-910	—	10	98102A129	00000
	1/4"	0.312"	0.734"	0.051" to 0.080"	MS15795-911	—	10	98102A131	00000
	5/16"	0.344"	0.688"	0.051" to 0.080"	MS15795-912	—	10	98102A132	00000
	5/16"	0.375"	0.875"	0.035" to 0.045"	MS15795-951	—	10	98102A133	00000
	5/16"	0.375"	0.875"	0.064" to 0.104"	MS15795-913	—	10	98102A134	00000
	3/8"	0.406"	0.688"	0.024" to 0.034"	MS15795-952	—	10	98102A135	00000
	3/8"	0.406"	0.812"	0.051" to 0.080"	MS15795-914	—	10	98102A136	00000


	3/8"	0.438"	1.000"	0.064" to 0.104"	MS15795-915	—	1	98102A137	0000
	7/16"	0.469"	0.922"	0.051" to 0.080"	MS15795-916	—	1	98102A138	0000
	7/16"	0.500"	1.250"	0.064" to 0.104"	MS15795-917	—	1	98102A139	0000
	1/2"	0.531"	1.062"	0.074" to 0.121"	MS15795-918	Material Certificate	1	98102A141	0000
	5/8"	0.688"	1.750"	0.108" to 0.160"	MS15795-921	Material Certificate	1	98102A146	00000
	3/4"	0.812"	1.469"	0.108" to 0.160"	MS15795-922	—	1	98102A147	0000
	1"	1.062"	2.000"	0.108" to 0.160"	MS15795-926	—	1	98102A151	00000

Copper

These have the best conductivity of all our metal washers. They're often used to secure electrical connections inside breaker panels and to fasten components on printed circuit boards. They're also the softest of all our metal washers, so they won't damage screws and nuts. However, copper washers aren't as corrosion resistant as brass washers, and will develop a green patina over time.

	ID	OD	Thk.	Mil. Spec.	Pkg. Qty.		Pkg.
Copper



	No. 1	0.078"	0.188"	0.016" to 0.025"	MS15795-501	100	97565A111	000000


	No. 2	0.094"	0.250"	0.016" to 0.025"	MS15795-502	100	97565A112	00000
	No. 4	0.125"	0.250"	0.017" to 0.028"	MS15795-503	100	97565A113	00000
	No. 4	0.125"	0.312"	0.025" to 0.040"	MS15795-504	50	97565A114	00000
	No. 5	0.141"	0.406"	0.035" to 0.045"	MS15795-544	50	97565A115	00000
	No. 6	0.156"	0.312"	0.027" to 0.048"	MS15795-505	50	97565A116	00000
	No. 6	0.156"	0.375"	0.036" to 0.065"	MS15795-506	50	97565A117	00000
	No. 8	0.188"	0.375"	0.036" to 0.065"	MS15795-507	50	97565A118	00000
	No. 8	0.188"	0.438"	0.036" to 0.065"	MS15795-541	50	97565A119	00000
	No. 10	0.219"	0.438"	0.027" to 0.048"	MS15795-545	50	97565A121	00000
	No. 10	0.219"	0.438"	0.036" to 0.065"	MS15795-508	50	97565A122	00000


	No. 10	0.219"	0.500"	0.036" to 0.065"	MS15795-542	50	97565A123	00000
	No. 12	0.250"	0.562"	0.051" to 0.080"	MS15795-509	25	97565A124	00000
	1/4"	0.281"	0.625"	0.051" to 0.080"	MS15795-510	25	97565A125	00000
	1/4"	0.312"	0.734"	0.051" to 0.080"	MS15795-511	20	97565A126	00000
	5/16"	0.344"	0.562"	0.027" to 0.048"	MS15795-547	50	97565A127	00000
	5/16"	0.344"	0.688"	0.051" to 0.080"	MS15795-512	20	97565A128	00000
	5/16"	0.375"	0.875"	0.064" to 0.104"	MS15795-513	5	97565A129	00000
	3/8"	0.406"	0.812"	0.051" to 0.080"	MS15795-514	10	97565A131	00000
	3/8"	0.438"	1.000"	0.064" to 0.104"	MS15795-515	5	97565A132	00000
	7/16"	0.469"	0.922"	0.051" to 0.080"	MS15795-516	10	97565A133	00000


	7/16"	0.500"	1.250"	0.064" to 0.104"	MS15795-517	5	97565A134	00000
	1/2"	0.531"	1.062"	0.074" to 0.121"	MS15795-518	5	97565A135	00000
	1/2"	0.562"	1.375"	0.086" to 0.132"	MS15795-519	5	97565A136	00000
	9/16"	0.594"	1.469"	0.090" to 0.112"	MS15795-543	1	97565A137	00000
	9/16"	0.625"	1.000"	0.027" to 0.048"	MS15795-552	10	97565A139	00000
	5/8"	0.656"	1.312"	0.074" to 0.121"	MS15795-520	5	97565A141	00000
	3/4"	0.812"	1.469"	0.108" to 0.160"	MS15795-522	1	97565A143	00000
	7/8"	0.938"	1.750"	0.108" to 0.160"	MS15795-524	1	97565A144	00000
	1"	1.062"	2.000"	0.108" to 0.160"	MS15795-526	1	97565A145	00000

Nickel

Highly Corrosion-Resistant 400 Nickel—Commonly found in the oil and gas industries, these washers have similar strength to 316 stainless steel, but are more corrosion resistant to stand up to salt water and harsh acids. They're often used as a high-strength alternative to titanium. Also known as Monel.

	ID	OD	Thk.	Mil. Spec.	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant 400 Nickel



	No. 1	0.078"	0.188"	0.016" to 0.025"	MS15795-401	25	97168A111	000000


	No. 2	0.094"	0.250"	0.016" to 0.025"	MS15795-402	25	97168A112	00000
	No. 4	0.125"	0.250"	0.017" to 0.028"	MS15795-403	25	97168A113	00000
	No. 4	0.125"	0.312"	0.025" to 0.040"	MS15795-404	25	97168A114	00000
	No. 6	0.156"	0.312"	0.027" to 0.048"	MS15795-405	25	97168A115	00000
	No. 8	0.188"	0.375"	0.036" to 0.065"	MS15795-407	10	97168A117	00000
	No. 8	0.188"	0.438"	0.036" to 0.065"	MS15795-441	10	97168A137	00000
	No. 10	0.219"	0.438"	0.036" to 0.065"	MS15795-408	10	97168A118	00000
	No. 10	0.219"	0.500"	0.036" to 0.065"	MS15795-442	10	97168A138	00000
	1/4"	0.281"	0.625"	0.051" to 0.080"	MS15795-410	5	97168A121	00000
	1/4"	0.312"	0.734"	0.051" to 0.080"	MS15795-411	5	97168A122	00000


	3/8"	0.406"	0.625"	0.051" to 0.080"	MS15795-448	5	97168A141	00000
	3/8"	0.406"	0.812"	0.051" to 0.080"	MS15795-414	1	97168A125	0000
	7/16"	0.500"	0.875"	0.058" to 0.070"	MS15795-449	1	97168A142	0000
	1/2"	0.531"	1.062"	0.074" to 0.121"	MS15795-418	1	97168A129	00000
	5/8"	0.688"	1.750"	0.108" to 0.160"	MS15795-421	1	97168A133	00000
	3/4"	0.812"	1.469"	0.108" to 0.160"	MS15795-422	1	97168A134	00000