ISO Class 8.8 Washers | McMaster-Carr

Filter by

System of Measurement

Screw Size

Fastener Strength Grade/Class

Finish

Material

Washer Type

Specifications Met

Thickness

Fastener Strength Rating

Washer Designation

Hardness

Performance

USMCA Qualifying

RoHS Compliance

DFARS Compliance

REACH Compliance

Application

Tension Indicated

Forward

How can we improve?

67 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.

Super-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.

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


	M2	2.2	5.0	0.2 to 0.4	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	00000
	M2.5	2.7	6.0	0.4 to 0.6	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	0000
	M3	3.2	7.0	0.4 to 0.6	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	0000
	M4	4.3	9.0	0.7 to 0.9	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	0000
	M5	5.3	10.0	0.9 to 1.1	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	0000
	M6	6.4	12.0	1.4 to 1.8	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	0000
	M8	8.4	16.0	1.4 to 1.8	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	00000
	M10	10.5	20.0	1.8 to 2.2	ISO Class 8.8	DIN 125, ISO 7089	100	000000000	00000
	M12	13.0	24.0	2.3 to 2.7	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	00000
	M14	15.0	28.0	2.3 to 2.7	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	00000
	M16	17.0	30.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	00000
	M18	19.0	34.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	25	000000000	00000
	M20	21.0	37.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	25	000000000	00000
	M22	23.0	39.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	5	000000000	00000
	M24	25.0	44.0	3.7 to 4.3	ISO Class 8.8	DIN 125, ISO 7089	5	000000000	0000
	M30	31.0	56.0	3.7 to 4.3	ISO Class 8.8	DIN 125, ISO 7089	5	000000000	00000
	M36	37.0	66.0	4.4 to 5.6	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	0000
	M39	40.0	72.0	5.4 to 6.6	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	00000
	M42	43.0	78.0	6.0 to 8.0	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	00000

	Super-Corrosion-Resistant Zinc-Flake-Coated Steel


			M4	4.3	9.0	0.7 to 0.9	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	0000
			M5	5.3	10.0	0.9 to 1.1	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	0000
			M6	6.4	12.0	1.4 to 1.8	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	0000
			M8	8.4	16.0	1.4 to 1.8	ISO Class 8.8	DIN 125, ISO 7089	50	000000000	00000
			M10	10.5	20.0	1.8 to 2.2	ISO Class 8.8	DIN 125, ISO 7089	25	000000000	00000
			M12	13.0	24.0	2.3 to 2.7	ISO Class 8.8	DIN 125, ISO 7089	10	000000000	0000
			M14	15.0	28.0	2.3 to 2.7	ISO Class 8.8	DIN 125, ISO 7089	10	000000000	00000
			M16	17.0	30.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	10	000000000	00000
			M18	19.0	34.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	5	000000000	00000
			M20	21.0	37.0	2.7 to 3.3	ISO Class 8.8	DIN 125, ISO 7089	5	000000000	00000
			M24	25.0	44.0	3.7 to 4.3	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	0000
			M30	31.0	56.0	3.7 to 4.3	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	00000

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.

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	3.3	8.7	0.7 to 0.9	ISO Class 8.8	DIN 9021	100	000000000	000000
	M3	3.3	8.7	0.9 to 1.1	ISO Class 8.8	DIN 7349	100	000000000	00000
	M4	4.4	11.7	0.9 to 1.1	ISO Class 8.8	DIN 9021	100	000000000	00000
	M4	4.4	11.7	1.4 to 1.8	ISO Class 8.8	DIN 7349	50	000000000	00000
	M5	5.4	14.7	1.0 to 1.4	ISO Class 8.8	DIN 9021	100	000000000	00000
	M5	5.4	14.7	1.8 to 2.2	ISO Class 8.8	DIN 7349	50	000000000	00000
	M6	6.5	16.7	2.7 to 3.3	ISO Class 8.8	DIN 7349	25	000000000	00000
	M6	6.5	17.7	1.4 to 1.8	ISO Class 8.8	DIN 9021	50	000000000	00000
	M8	8.5	20.7	3.7 to 4.3	ISO Class 8.8	DIN 7349	10	000000000	00000
	M8	8.5	23.7	1.8 to 2.2	ISO Class 8.8	DIN 9021	25	000000000	00000
	M10	10.6	24.7	3.7 to 4.3	ISO Class 8.8	DIN 7349	10	000000000	00000
	M10	10.6	29.7	2.3 to 2.7	ISO Class 8.8	DIN 9021	10	000000000	00000
	M12	13.1	36.6	2.7 to 3.3	ISO Class 8.8	DIN 9021	5	000000000	00000
	M12	13.2	29.5	5.4 to 6.6	ISO Class 8.8	DIN 7349	1	000000000	0000
	M16	17.1	49.6	2.7 to 3.3	ISO Class 8.8	DIN 9021	1	000000000	0000
	M16	17.2	39.5	5.4 to 6.6	ISO Class 8.8	DIN 7349	1	000000000	0000
	M20	22.2	58.4	3.4 to 4.6	ISO Class 8.8	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.

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 8.8	DIN 433	100	000000000	00000
	M4	4.3	8.0	0.5 to 0.6	ISO Class 8.8	DIN 433	100	000000000	0000
	M5	5.3	9.0	0.9 to 1.1	ISO Class 8.8	DIN 433	100	000000000	0000
	M6	6.4	11.0	1.4 to 1.8	ISO Class 8.8	DIN 433	100	000000000	00000
	M8	8.4	15.0	1.4 to 1.8	ISO Class 8.8	DIN 433	50	000000000	00000
	M10	10.5	18.0	1.4 to 1.8	ISO Class 8.8	DIN 433	50	000000000	00000
	M12	13.0	20.0	1.8 to 2.2	ISO Class 8.8	DIN 433	25	000000000	00000
	M14	15.0	24.0	2.3 to 2.7	ISO Class 8.8	DIN 433	10	000000000	0000
	M16	17.0	28.0	2.3 to 2.7	ISO Class 8.8	DIN 433	10	000000000	00000
	M20	21.0	34.0	2.7 to 3.3	ISO Class 8.8	DIN 433	5	000000000	00000
	M24	25.0	39.0	3.7 to 4.3	ISO Class 8.8	DIN 433	1	000000000	0000

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

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.
Corrosion-Resistant Galvanized Steel


	M12	12.6	27.3	2.6 to 4.6	ISO Class 8.8	ASME B18.2.6M, ASTM F959	10	000000000	000000
	M16	16.7	33.6	3.2 to 5.5	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	0000
	M20	21.0	40.6	3.6 to 6.0	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	00000
	M22	23.0	42.9	3.6 to 6.0	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	00000
	M24	25.1	48.7	4.0 to 7.0	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M27	28.4	54.4	4.0 to 7.0	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M30	31.4	58.4	4.0 to 7.0	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
	M36	37.7	70.4	4.8 to 7.5	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000