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    41 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
    Image of Product. Front orientation. Washers. Tension-Indicating Structural Washers.
    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 A490500000000000000
    5/8"
    0.657"1.323"0.126" to 0.220"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49050000000000000
    3/4"
    0.785"1.478"0.126" to 0.240"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A490500000000000000
    7/8"
    0.915"1.760"0.142" to 0.260"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49010000000000000
    1"
    1.045"2.010"0.158" to 0.270"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49010000000000000
    1 1/8"
    1.155"2.260"0.158" to 0.280"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49010000000000000
    1 1/4"
    1.310"2.510"0.158" to 0.280"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49010000000000000
    1 1/2"
    1.570"3.010"0.158" to 0.280"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49010000000000000
    M16
    16.7 mm33.6 mm3.2 mm to 5.5 mmISO Class 10.9
    ASME B18.2.6M, ASTM F959500000000000000
    M20
    21.0 mm40.6 mm3.6 mm to 6.0 mmISO Class 10.9
    ASME B18.2.6M, ASTM F959500000000000000
    M22
    23.0 mm42.9 mm3.6 mm to 6.0 mmISO Class 10.9
    ASME B18.2.6M, ASTM F95910000000000000
    M24
    25.1 mm48.7 mm4.0 mm to 7.0 mmISO Class 10.9
    ASME B18.2.6M, ASTM F95910000000000000
    M27
    28.4 mm54.4 mm4.0 mm to 7.0 mmISO Class 10.9
    ASME B18.2.6M, ASTM F95910000000000000
    M30
    31.4 mm58.4 mm4.0 mm to 7.0 mmISO Class 10.9
    ASME B18.2.6M, ASTM F95910000000000000
    M36
    37.7 mm70.4 mm4.8 mm to 7.5 mmISO Class 10.9
    ASME B18.2.6M, ASTM F95910000000000000
     
    Steel
    1/2"
    0.520"1.073"0.104" to 0.111"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32550000000000000
    1/2"
    0.520"1.073"0.104" to 0.180"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49050000000000000
    5/8"
    0.657"1.323"0.126" to 0.133"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32550000000000000
    5/8"
    0.657"1.323"0.126" to 0.220"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49050000000000000
    3/4"
    0.785"1.478"0.142" to 0.240"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A490500000000000000
    7/8"
    0.915"1.760"0.142" to 0.149"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A325500000000000000
    7/8"
    0.915"1.760"0.158" to 0.260"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A49050000000000000
    1"
    1.045"2.010"0.158" to 0.165"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A325500000000000000
    1"
    1.045"2.010"0.158" to 0.270"ASTM Grade A490
    ASME B18.2.6, ASTM F959 Type A490500000000000000
     
    Corrosion-Resistant Galvanized Steel
    1/2"
    0.520"1.073"0.104" to 0.180"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32550000000000000
    5/8"
    0.657"1.323"0.126" to 0.220"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32550000000000000
    3/4"
    0.785"1.478"0.142" to 0.230"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32550000000000000
    7/8"
    0.915"1.760"0.158" to 0.240"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    1"
    1.045"2.010"0.158" to 0.270"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    1 1/8"
    1.155"2.260"0.158" to 0.270"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    1 1/4"
    1.310"2.510"0.158" to 0.270"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    1 3/8"
    1.442"2.760"0.158" to 0.270"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    1 1/2"
    1.570"3.010"0.158" to 0.270"ASTM Grade A325ASME B18.2.6, ASTM F959 Type A32510000000000000
    M12
    12.6 mm27.3 mm2.6 mm to 4.6 mmISO Class 8.8
    ASME B18.2.6M, ASTM F9591000000000000000
    M16
    16.7 mm33.6 mm3.2 mm to 5.5 mmISO Class 8.8
    ASME B18.2.6M, ASTM F95950000000000000
    M20
    21.0 mm40.6 mm3.6 mm to 6.0 mmISO Class 8.8
    ASME B18.2.6M, ASTM F959500000000000000
    M22
    23.0 mm42.9 mm3.6 mm to 6.0 mmISO Class 8.8
    ASME B18.2.6M, ASTM F959500000000000000
    M24
    25.1 mm48.7 mm4.0 mm to 7.0 mmISO Class 8.8
    ASME B18.2.6M, ASTM F95910000000000000
    M27
    28.4 mm54.4 mm4.0 mm to 7.0 mmISO Class 8.8
    ASME B18.2.6M, ASTM F95910000000000000
    M30
    31.4 mm58.4 mm4.0 mm to 7.0 mmISO Class 8.8
    ASME B18.2.6M, ASTM F95910000000000000
    M36
    37.7 mm70.4 mm4.8 mm to 7.5 mmISO Class 8.8
    ASME B18.2.6M, ASTM F95910000000000000
     
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