ISO Class 10.9 Washers | McMaster-Carr

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104 Products

General Purpose Washers

Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

Highly Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated steel, these withstand rust as well as 316 stainless steel. They have been tested to extreme standards, including 1,000 hours of salt spray. They are similar to Magni-coated washers.

Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 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.

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

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	For Screw Size	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M2	2.2	5.0	0.3 to 0.4	Class 10.9	—	100	98688A147	000000


		M2.5	2.7	6.0	0.5 to 0.6	Class 10.9	—	100	98688A148	0000
		M3	3.2	7.0	0.5 to 0.6	Class 10.9	Material Certificate	100	98688A142	0000
		M4	4.3	9.0	0.7 to 0.9	Class 10.9	—	100	98688A143	00000
		M5	5.3	10.0	0.9 to 1.1	Class 10.9	Material Certificate	100	98688A144	00000
		M6	6.4	12.0	1.4 to 1.8	Class 10.9	—	100	91455A611	0000
		M8	8.4	16.0	1.4 to 1.8	Class 10.9	—	50	91455A612	0000
		M10	10.5	20.0	1.8 to 2.2	Class 10.9	—	50	91455A613	0000
		M12	13.0	24.0	2.3 to 2.7	Class 10.9	—	25	91455A614	0000
		M14	15.0	28.0	2.3 to 2.7	Class 10.9	—	25	91455A615	0000
		M16	17.0	30.0	2.7 to 3.3	Class 10.9	—	25	91455A616	00000


		M18	19.0	34.0	2.7 to 3.3	Class 10.9	—	5	98688A145	0000
		M20	21.0	37.0	2.7 to 3.3	Class 10.9	—	10	91455A617	0000
		M22	23.0	39.0	2.7 to 3.3	Class 10.9	Material Certificate	5	98688A161	00000
		M24	25.0	44.0	3.7 to 4.3	Class 10.9	—	10	91455A618	00000
		M30	31.0	56.0	3.7 to 4.3	Class 10.9	—	1	98688A146	0000


		Zinc-Yellow-Chromate-Plated Steel



				M3	3.2	7.0	0.5 to 0.6	Class 10.9	—	100	90483A151	0000


				M4	4.3	9.0	0.7 to 0.9	Class 10.9	—	100	90483A152	00000
				M5	5.3	10.0	0.9 to 1.1	Class 10.9	Material Certificate	100	90483A153	00000
				M6	6.4	12.0	1.4 to 1.8	Class 10.9	Material Certificate	50	90483A154	00000
				M8	8.4	16.0	1.4 to 1.8	Class 10.9	Material Certificate	25	90483A155	0000
				M10	10.5	20.0	1.8 to 2.2	Class 10.9	Material Certificate	25	90483A156	00000
				M12	13.0	24.0	2.3 to 2.7	Class 10.9	Material Certificate	10	90483A157	0000
				M14	15.0	28.0	2.3 to 2.7	Class 10.9	—	10	90483A158	0000
				M16	17.0	30.0	2.7 to 3.3	Class 10.9	Material Certificate	5	90483A159	0000
				M18	19.0	34.0	2.7 to 3.3	Class 10.9	—	5	90483A171	0000
				M20	21.0	37.0	2.7 to 3.3	Class 10.9	Material Certificate	5	90483A172	0000


				M22	23.0	39.0	2.7 to 3.3	Class 10.9	—	5	90483A173	0000
				M24	25.0	44.0	3.7 to 4.3	Class 10.9	—	1	90483A174	0000
				M30	31.0	56.0	3.7 to 4.3	Class 10.9	—	1	90483A175	0000


				Highly Corrosion-Resistant Zinc-Flake-Coated Steel



						M6	6.4	12.0	1.4 to 1.8	Class 10.9	—	100	90486A101	00000


						M8	8.4	16.0	1.4 to 1.8	Class 10.9	—	100	90486A102	00000
						M10	10.5	20.0	1.8 to 2.2	Class 10.9	—	100	90486A103	00000
						M12	13.0	24.0	2.3 to 2.7	Class 10.9	—	100	90486A104	00000


						Black Super-Corrosion-Resistant-Coated Steel



M6	6.4							12.0	1.4 to 1.8	Class 10.9	—	10	93413A341	00000


M8	8.4							16.0	1.4 to 1.8	Class 10.9	—	5	93413A342	0000
M10	10.5							20.0	1.8 to 2.2	Class 10.9	—	5	93413A343	0000
M12	13.0							24.0	2.3 to 2.7	Class 10.9	—	5	93413A344	00000

Structural Washers

Distribute pressure under structural screws and nuts in columns, joists, and I-beams. These thick washers are tested and certified to meet industry standards for handling high-stress loads.

Steel

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

Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M12	13.0	24.0	2.7 to 3.3	Class 10.9	DIN 6916, ISO 7416	10	91144A122	00000


	M14	15.0	28.0	2.7 to 3.3	Class 10.9	DIN 6916, ISO 7416	10	91144A123	0000
	M16	17.0	30.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	5	91144A124	0000
	M20	21.0	37.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	5	91144A125	0000
	M22	23.0	39.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	5	91144A126	0000
	M24	25.0	44.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	1	91144A127	0000
	M27	28.0	50.0	4.4 to 5.6	Class 10.9	DIN 6916, ISO 7416	1	91144A128	0000
	M30	31.0	56.0	4.4 to 5.6	Class 10.9	DIN 6916, ISO 7416	1	91144A129	0000
	M36	37.0	66.0	5.4 to 6.6	Class 10.9	DIN 6916, ISO 7416	1	91144A131	0000


	Corrosion-Resistant Galvanized Steel



			M12	13.0	24.0	2.7 to 3.3	Class 10.9	DIN 6916, ISO 7416	25	91144A111	00000


			M14	15.0	28.0	2.7 to 3.3	Class 10.9	DIN 6916, ISO 7416	10	91144A118	0000
			M16	17.0	30.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	10	91144A112	00000
			M20	21.0	37.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	10	91144A113	00000
			M22	23.0	39.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	5	91144A114	0000
			M24	25.0	44.0	3.7 to 4.3	Class 10.9	DIN 6916, ISO 7416	5	91144A115	00000
			M27	28.0	50.0	4.4 to 5.6	Class 10.9	DIN 6916, ISO 7416	1	91144A116	0000
			M30	31.0	56.0	4.4 to 5.6	Class 10.9	DIN 6916, ISO 7416	1	91144A117	0000

Oversized Washers

Cover oversized holes or use these washers as spacers and levelers. Compared to general purpose washers, these have a larger diameter or thickness.

Steel

Image of Product. Front orientation. Contains Annotated. Washers. Oversized Washers.

Image of Specification. Front orientation. Washers. Oversized Washers.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk.	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M6	6.5	16.7	2.7 mm to 3.3 mm	Class 10.9	DIN 7349	10	91100A322	00000


	M6	6.5	17.7	1.4 mm to 1.8 mm	Class 10.9	DIN 9021	25	91100A321	00000
	M8	8.5	20.7	3.7 mm to 4.3 mm	Class 10.9	DIN 7349	10	91100A324	00000
	M8	8.5	23.7	1.8 mm to 2.2 mm	Class 10.9	DIN 9021	10	91100A323	0000
	M10	10.6	24.7	3.7 mm to 4.3 mm	Class 10.9	DIN 7349	5	91100A326	00000
	M10	10.6	29.7	2.3 mm to 2.7 mm	Class 10.9	DIN 9021	5	91100A325	00000
	M12	13.1	36.6	2.7 mm to 3.3 mm	Class 10.9	DIN 9021	5	91100A327	00000
	M14	15.1	43.6	2.7 mm to 3.3 mm	Class 10.9	DIN 9021	1	91100A328	0000
	M16	17.1	49.6	2.7 mm to 3.3 mm	Class 10.9	DIN 9021	1	91100A329	0000
	M20	22.2	58.5	3.4 mm to 4.6 mm	Class 10.9	DIN 9021	1	91100A331	00000


	Zinc-Yellow-Chromate-Plated Steel



			M6	6.5	16.7	2.7 mm to 3.3 mm	Class 10.9	DIN 7349	10	98026A514	0000


			M6	6.5	17.7	1.4 mm to 1.8 cm	Class 10.9	DIN 9021	25	98026A513	00000
			M8	8.5	20.7	3.7 mm to 4.3 mm	Class 10.9	DIN 7349	10	98026A517	00000
			M8	8.5	23.7	1.8 mm to 2.2 mm	Class 10.9	DIN 9021	10	98026A516	0000
			M10	10.6	24.7	3.7 mm to 4.3 mm	Class 10.9	DIN 7349	5	98026A520	00000
			M10	10.6	29.7	2.3 mm to 2.7 mm	Class 10.9	DIN 9021	5	98026A519	00000
			M12	13.1	36.6	2.7 mm to 3.3 mm	Class 10.9	DIN 9021	5	98026A522	00000
			M16	17.1	49.6	2.7 mm to 3.3 mm	Class 10.9	DIN 9021	1	98026A525	0000

Undersized Washers

These washers distribute pressure evenly under fasteners with narrow heads, such as cheese and socket head screws. They have smaller diameters than general purpose washers of the same screw size.

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M3	3.2	6.0	0.5 to 0.6	Class 10.9	DIN 433	100	98688A149	00000


	M4	4.3	8.0	0.5 to 0.6	Class 10.9	DIN 433	100	98688A151	00000
	M5	5.3	9.0	0.9 to 1.1	Class 10.9	DIN 433	100	98688A152	00000
	M6	6.4	11.0	1.4 to 1.8	Class 10.9	DIN 433	50	98688A153	00000
	M8	8.4	15.0	1.4 to 1.8	Class 10.9	DIN 433	25	98688A154	0000
	M10	10.5	18.0	1.4 to 1.8	Class 10.9	DIN 433	25	98688A155	0000
	M12	13.0	20.0	1.8 to 2.2	Class 10.9	DIN 433	25	98688A156	00000
	M14	15.0	24.0	2.3 to 2.7	Class 10.9	DIN 433	10	98688A157	00000
	M16	17.0	28.0	2.3 to 2.7	Class 10.9	DIN 433	10	98688A158	0000
	M20	21.0	34.0	2.7 to 3.3	Class 10.9	DIN 433	5	98688A159	0000
	M24	25.0	39.0	3.7 to 4.3	Class 10.9	DIN 433	1	98688A162	0000


	Zinc-Yellow-Chromate-Plated Steel



			M4	4.3	8.0	0.5 to 0.6	Class 10.9	DIN 433	100	90483A176	00000


			M5	5.3	9.0	0.9 to 1.1	Class 10.9	DIN 433	100	90483A177	00000
			M6	6.4	11.0	1.4 to 1.8	Class 10.9	DIN 433	50	90483A178	00000
			M8	8.4	15.0	1.4 to 1.8	Class 10.9	DIN 433	25	90483A179	0000
			M10	10.5	18.0	1.4 to 1.8	Class 10.9	DIN 433	25	90483A191	0000
			M12	13.0	20.0	1.8 to 2.2	Class 10.9	DIN 433	25	90483A192	00000
			M14	15.0	24.0	2.3 to 2.7	Class 10.9	DIN 433	10	90483A193	00000
			M16	17.0	28.0	2.3 to 2.7	Class 10.9	DIN 433	10	90483A194	00000
			M20	21.0	34.0	2.7 to 3.3	Class 10.9	DIN 433	5	90483A195	00000

Tension-Indicating Structural Washers

Fasten structural screws and nuts securely without overtightening. When you see orange dye, you'll know you've applied the correct tension, so you don't accidentally strip threads. These washers distribute pressure under fasteners in columns, joists, and I-beams. They are tested and certified to meet industry standards for handling high-stress loads.

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M16	16.7	33.6	3.2 to 5.5	Class 10.9	ASME B18.2.6M, ASTM F959	5	95348A120	000000


	M20	21.0	40.6	3.6 to 6.0	Class 10.9	ASME B18.2.6M, ASTM F959	5	95348A121	00000
	M22	23.0	42.9	3.6 to 6.0	Class 10.9	ASME B18.2.6M, ASTM F959	1	95348A122	0000
	M24	25.1	48.7	4.0 to 7.0	Class 10.9	ASME B18.2.6M, ASTM F959	1	95348A123	0000
	M27	28.4	54.4	4.0 to 7.0	Class 10.9	ASME B18.2.6M, ASTM F959	1	95348A124	0000
	M30	31.4	58.4	4.0 to 7.0	Class 10.9	ASME B18.2.6M, ASTM F959	1	95348A125	0000
	M36	37.7	70.4	4.8 to 7.5	Class 10.9	ASME B18.2.6M, ASTM F959	1	95348A126	0000

Steel Hex Head Screw, Nut, and Washer Assortments

Keep a range of hex head screw, nut, and washer sizes on hand for a variety of jobs. The screws in these assortments have heads with six flat sides to keep wrenches and sockets slipping and rounding off the drive.

Length is measured from under the head.

High-Strength Fastener—Commonly used to fasten components in valves, pumps, motors, and other high-stress applications. These screws have a tensile strength of 125,000 to 160,000 psi.

Zinc-Yellow-Chromate-Plated Steel—With slightly better corrosion resistance than zinc-plated steel screws, these stand up to more frequent exposure to moisture.

	Hex Head Screws Included	Hex Nuts Included	Split Lock Washers Included	Flat Washers Included	Fastener Strength Grade/Class	Container Type		Each
High-Strength Zinc-Yellow-Chromate-Plated Steel



	295	M10 × 1.5 mm Thread: 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 50 mm, 60 mm, 70 mm, and 80 mm Lg. (125 pieces)	M10 × 1.5 mm Thread (45 Pieces)	For M10 Screw Size (60 Pieces)	For M10 Screw Size (65 pieces)	Class 10.9, Class 10	Metal Box	94148A213	0000000


	600	M8 × 1.25 mm Thread: 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 50 mm, and 60 mm Lg. (185 pieces)	M8 × 1.25 mm Thread (135 Pieces)	For M8 Screw Size (90 Pieces)	For M8 Screw Size (190 pieces)	Class 10.9, Class 10	Metal Box	94148A212	000000
	675	M6 × 1 mm Thread: 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 40 mm, 50 mm, and 60 mm Lg. (330 pieces)	M6 × 1 mm Thread (75 Pieces)	For M6 Screw Size (120 Pieces)	For M6 Screw Size (150 pieces)	Class 10.9, Class 10	Metal Box	94148A211	000000


	High-Strength Steel



			575	M6 × 1 mm Thread: 16 mm., 25 mm, and 35 mm Lg. (75 Pieces) M8 × 1.25 mm Thread: 16 mm, 25 mm, and 35 mm Lg. (45 pieces) M10 × 1.5 mm Thread: 16 mm, 25 mm, and 35 mm Lg. (30 pieces) M12 × 1.75 mm Thread: 20 mm, 30 mm, and 40 mm Lg. (15 pieces)	M6 × 1 mm Thread (75 Pieces) M8 × 1.25 mm Thread (45 Pieces) M10 × 1.5 mm Thread (30 Pieces) M12 × 1.75 mm Thread (15 Pieces)	For M6 Screw Size (100 Pieces) For M8 Screw Size (100 Pieces) For M10 Screw Size (30 Pieces) For M12 Screw Size (15 Pieces)	—	Class 10.9, Class 10	Metal Box	91310A100	000000