ISO Class 10.9 Washers | McMaster-Carr

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Material

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EAR99

DFARS Specialty Metals

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100 Products

Performance

Corrosion Resistant

Won't rust in wet and outdoor environments

16 products

High Strength

Withstand heavy loads and high stress without deforming

61 products

Performance

Tension Indicating

Change color when you apply the correct tension to prevent overtightening

7 products

Application

Structural

Support structural screws and nuts in columns, joists, and I-beams

24 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.

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	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M2	2.2	5.0	0.3 to 0.4	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	000000


		M2.5	2.7	6.0	0.5 to 0.6	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000
		M3	3.2	7.0	0.5 to 0.6	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000
		M4	4.3	9.0	0.7 to 0.9	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000
		M5	5.3	10.0	0.9 to 1.1	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000
		M6	6.4	12.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000
		M8	8.4	16.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	50	000000000	0000
		M10	10.5	20.0	1.8 to 2.2	ISO Class 10.9	DIN 125, ISO 7089	50	000000000	00000
		M12	13.0	24.0	2.3 to 2.7	ISO Class 10.9	DIN 125, ISO 7089	25	000000000	0000
		M14	15.0	28.0	2.3 to 2.7	ISO Class 10.9	DIN 125, ISO 7089	25	000000000	00000
		M16	17.0	30.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	25	000000000	00000


		M18	19.0	34.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000
		M20	21.0	37.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	10	000000000	0000
		M22	23.0	39.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000
		M24	25.0	44.0	3.7 to 4.3	ISO Class 10.9	DIN 125, ISO 7089	10	000000000	00000
		M30	31.0	56.0	3.7 to 4.3	ISO Class 10.9	DIN 125, ISO 7089	1	000000000	0000


		Zinc-Yellow-Chromate-Plated Steel



				M3	3.2	7.0	0.5 to 0.6	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000


				M4	4.3	9.0	0.7 to 0.9	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000
				M5	5.3	10.0	0.9 to 1.1	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000
				M6	6.4	12.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	50	000000000	00000
				M8	8.4	16.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	25	000000000	0000
				M10	10.5	20.0	1.8 to 2.2	ISO Class 10.9	DIN 125, ISO 7089	25	000000000	00000
				M12	13.0	24.0	2.3 to 2.7	ISO Class 10.9	DIN 125, ISO 7089	10	000000000	0000
				M14	15.0	28.0	2.3 to 2.7	ISO Class 10.9	DIN 125, ISO 7089	10	000000000	0000
				M16	17.0	30.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000
				M18	19.0	34.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000
				M20	21.0	37.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000


				M22	23.0	39.0	2.7 to 3.3	ISO Class 10.9	DIN 125, ISO 7089	5	000000000	0000
				M24	25.0	44.0	3.7 to 4.3	ISO Class 10.9	DIN 125, ISO 7089	1	000000000	0000
				M30	31.0	56.0	3.7 to 4.3	ISO Class 10.9	DIN 125, ISO 7089	1	000000000	0000


				Highly Corrosion-Resistant Zinc-Flake-Coated Steel



						M6	6.4	12.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000


						M8	8.4	16.0	1.4 to 1.8	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000
						M10	10.5	20.0	1.8 to 2.2	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	0000
						M12	13.0	24.0	2.3 to 2.7	ISO Class 10.9	DIN 125, ISO 7089	100	000000000	00000


						Black Super-Corrosion-Resistant-Coated Steel



M6	6.4							12.0	1.4 to 1.8	ISO Class 10.9	DIN 125	10	000000000	00000


M8	8.4							16.0	1.4 to 1.8	ISO Class 10.9	DIN 125	5	000000000	0000
M10	10.5							20.0	1.8 to 2.2	ISO Class 10.9	DIN 125	5	000000000	0000
M12	13.0							24.0	2.3 to 2.7	ISO Class 10.9	DIN 125	5	000000000	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

Image of Product. Front orientation. Washers. Structural Washers.

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	ISO Class 10.9	DIN 6916, ISO 7416	10	000000000	00000


	M14	15.0	28.0	2.7 to 3.3	ISO Class 10.9	DIN 6916, ISO 7416	10	000000000	00000
	M16	17.0	30.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	5	000000000	0000
	M20	21.0	37.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	5	000000000	0000
	M22	23.0	39.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	5	000000000	00000
	M24	25.0	44.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	0000
	M27	28.0	50.0	4.4 to 5.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	0000
	M30	31.0	56.0	4.4 to 5.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	00000
	M36	37.0	66.0	5.4 to 6.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	00000


	Corrosion-Resistant Galvanized Steel



			M12	13.0	24.0	2.7 to 3.3	ISO Class 10.9	DIN 6916, ISO 7416	25	000000000	00000


			M14	15.0	28.0	2.7 to 3.3	ISO Class 10.9	DIN 6916, ISO 7416	10	000000000	00000
			M16	17.0	30.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	10	000000000	0000
			M20	21.0	37.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	10	000000000	00000
			M22	23.0	39.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	5	000000000	00000
			M24	25.0	44.0	3.7 to 4.3	ISO Class 10.9	DIN 6916, ISO 7416	5	000000000	00000
			M27	28.0	50.0	4.4 to 5.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	0000
			M30	31.0	56.0	4.4 to 5.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	0000

Oversized Washers

These washers have exaggerated diameters to cover large holes and to compensate for uneven mounting surfaces. They are also thicker than general purpose washers, so they bridge wide gaps when used as spacers.

Steel

Image of Product. 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., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M6	6.5	16.7	2.7 to 3.3	ISO Class 10.9	DIN 7349	10	000000000	00000


	M6	6.5	17.7	1.4 to 1.8	ISO Class 10.9	DIN 9021	25	000000000	00000
	M8	8.5	20.7	3.7 to 4.3	ISO Class 10.9	DIN 7349	10	000000000	00000
	M8	8.5	23.7	1.8 to 2.2	ISO Class 10.9	DIN 9021	10	000000000	0000
	M10	10.6	24.7	3.7 to 4.3	ISO Class 10.9	DIN 7349	5	000000000	00000
	M10	10.6	29.7	2.3 to 2.7	ISO Class 10.9	DIN 9021	5	000000000	00000
	M12	13.1	36.6	2.7 to 3.3	ISO Class 10.9	DIN 9021	5	000000000	00000
	M14	15.1	43.6	2.7 to 3.3	ISO Class 10.9	DIN 9021	1	000000000	0000
	M16	17.1	49.6	2.7 to 3.3	ISO Class 10.9	DIN 9021	1	000000000	0000
	M20	22.2	58.5	3.4 to 4.6	ISO Class 10.9	DIN 9021	1	000000000	00000


	Zinc-Yellow-Chromate-Plated Steel



			M6	6.5	16.7	2.7 to 3.3	ISO Class 10.9	DIN 7349	10	000000000	0000


			M6	6.5	17.7	1.4 to 1.8	ISO Class 10.9	DIN 9021	25	000000000	00000
			M8	8.5	20.7	3.7 to 4.3	ISO Class 10.9	DIN 7349	10	000000000	00000
			M8	8.5	23.7	1.8 to 2.2	ISO Class 10.9	DIN 9021	10	000000000	0000
			M10	10.6	24.7	3.7 to 4.3	ISO Class 10.9	DIN 7349	5	000000000	00000
			M10	10.6	29.7	2.3 to 2.7	ISO Class 10.9	DIN 9021	5	000000000	00000
			M12	13.1	36.6	2.7 to 3.3	ISO Class 10.9	DIN 9021	5	000000000	00000
			M16	17.1	49.6	2.7 to 3.3	ISO Class 10.9	DIN 9021	1	000000000	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	ISO Class 10.9	DIN 433	100	000000000	00000


	M4	4.3	8.0	0.5 to 0.6	ISO Class 10.9	DIN 433	100	000000000	00000
	M5	5.3	9.0	0.9 to 1.1	ISO Class 10.9	DIN 433	100	000000000	00000
	M6	6.4	11.0	1.4 to 1.8	ISO Class 10.9	DIN 433	50	000000000	00000
	M8	8.4	15.0	1.4 to 1.8	ISO Class 10.9	DIN 433	25	000000000	0000
	M10	10.5	18.0	1.4 to 1.8	ISO Class 10.9	DIN 433	25	000000000	0000
	M12	13.0	20.0	1.8 to 2.2	ISO Class 10.9	DIN 433	25	000000000	00000
	M14	15.0	24.0	2.3 to 2.7	ISO Class 10.9	DIN 433	10	000000000	00000
	M16	17.0	28.0	2.3 to 2.7	ISO Class 10.9	DIN 433	10	000000000	0000
	M20	21.0	34.0	2.7 to 3.3	ISO Class 10.9	DIN 433	5	000000000	0000
	M24	25.0	39.0	3.7 to 4.3	ISO Class 10.9	DIN 433	1	000000000	0000


	Zinc-Yellow-Chromate-Plated Steel



			M4	4.3	8.0	0.5 to 0.6	ISO Class 10.9	DIN 433	100	000000000	00000


			M5	5.3	9.0	0.9 to 1.1	ISO Class 10.9	DIN 433	100	000000000	00000
			M6	6.4	11.0	1.4 to 1.8	ISO Class 10.9	DIN 433	50	000000000	00000
			M8	8.4	15.0	1.4 to 1.8	ISO Class 10.9	DIN 433	25	000000000	0000
			M10	10.5	18.0	1.4 to 1.8	ISO Class 10.9	DIN 433	25	000000000	0000
			M12	13.0	20.0	1.8 to 2.2	ISO Class 10.9	DIN 433	25	000000000	00000
			M14	15.0	24.0	2.3 to 2.7	ISO Class 10.9	DIN 433	10	000000000	00000
			M16	17.0	28.0	2.3 to 2.7	ISO Class 10.9	DIN 433	10	000000000	00000
			M20	21.0	34.0	2.7 to 3.3	ISO Class 10.9	DIN 433	5	000000000	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	ISO Class 10.9	ASME B18.2.6M, ASTM F959	5	000000000	000000


	M20	21.0	40.6	3.6 to 6.0	ISO Class 10.9	ASME B18.2.6M, ASTM F959	5	000000000	00000
	M22	23.0	42.9	3.6 to 6.0	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M24	25.1	48.7	4.0 to 7.0	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M27	28.4	54.4	4.0 to 7.0	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M30	31.4	58.4	4.0 to 7.0	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M36	37.7	70.4	4.8 to 7.5	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000