Tension-Indicating 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.

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.

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



		1/2"	0.520"	1.073"	0.104" to 0.180"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	00000


		5/8"	0.657"	1.323"	0.126" to 0.220"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	0000
		3/4"	0.785"	1.478"	0.126" to 0.240"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	00000
		7/8"	0.915"	1.760"	0.142" to 0.260"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	1	000000000	0000
		1"	1.045"	2.010"	0.158" to 0.270"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	1	000000000	0000
		1 1/8"	1.155"	2.260"	0.158" to 0.280"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	1	000000000	0000
		1 1/4"	1.310"	2.510"	0.158" to 0.280"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	1	000000000	0000
		1 1/2"	1.570"	3.010"	0.158" to 0.280"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	1	000000000	0000
		M16	16.7 mm	33.6 mm	3.2 mm to 5.5 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	5	000000000	00000
		M20	21.0 mm	40.6 mm	3.6 mm to 6.0 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	5	000000000	00000
		M22	23.0 mm	42.9 mm	3.6 mm to 6.0 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000


		M24	25.1 mm	48.7 mm	4.0 mm to 7.0 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
		M27	28.4 mm	54.4 mm	4.0 mm to 7.0 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
		M30	31.4 mm	58.4 mm	4.0 mm to 7.0 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000
		M36	37.7 mm	70.4 mm	4.8 mm to 7.5 mm	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	0000


		Steel



				1/2"	0.520"	1.073"	0.104" to 0.111"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000


				1/2"	0.520"	1.073"	0.104" to 0.180"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	0000
				5/8"	0.657"	1.323"	0.126" to 0.133"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000
				5/8"	0.657"	1.323"	0.126" to 0.220"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	0000
				3/4"	0.785"	1.478"	0.142" to 0.240"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	0000
				7/8"	0.915"	1.760"	0.142" to 0.149"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000
				7/8"	0.915"	1.760"	0.158" to 0.260"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	00000
				1"	1.045"	2.010"	0.158" to 0.165"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	00000
				1"	1.045"	2.010"	0.158" to 0.270"	ASTM Grade A490	ASME B18.2.6, ASTM F959 Type A490	5	000000000	00000


				Corrosion-Resistant Galvanized Steel



						1/2"	0.520"	1.073"	0.104" to 0.180"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000


						5/8"	0.657"	1.323"	0.126" to 0.220"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000
						3/4"	0.785"	1.478"	0.142" to 0.230"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	5	000000000	0000
						7/8"	0.915"	1.760"	0.158" to 0.240"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						1"	1.045"	2.010"	0.158" to 0.270"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						1 1/8"	1.155"	2.260"	0.158" to 0.270"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						1 1/4"	1.310"	2.510"	0.158" to 0.270"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						1 3/8"	1.442"	2.760"	0.158" to 0.270"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						1 1/2"	1.570"	3.010"	0.158" to 0.270"	ASTM Grade A325	ASME B18.2.6, ASTM F959 Type A325	1	000000000	0000
						M12	12.6 mm	27.3 mm	2.6 mm to 4.6 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	10	000000000	00000
						M16	16.7 mm	33.6 mm	3.2 mm to 5.5 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	0000


						M20	21.0 mm	40.6 mm	3.6 mm to 6.0 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	00000
						M22	23.0 mm	42.9 mm	3.6 mm to 6.0 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	5	000000000	00000
						M24	25.1 mm	48.7 mm	4.0 mm to 7.0 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
						M27	28.4 mm	54.4 mm	4.0 mm to 7.0 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
M30						31.4 mm	58.4 mm	4.0 mm to 7.0 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000
M36	37.7 mm					70.4 mm	4.8 mm to 7.5 mm	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000