ASTM F959 Washers | McMaster-Carr

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15 Products

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.

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.
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


	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	00000


			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