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Fastener Strength Grade/Class Fastener StrengthGrade/Class  |
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Tension Indicated Tension Indicated |
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 | Tension Indicating |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Washers
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Tension-Indicating Washers for Structural Applications
When you’ve applied the correct tension, these washers release an orange dye as a visual indicator.
Class 8.8 washers are designed to support structural screws, studs, and nuts. Use them with DIN 6914 structural hex head bolts and DIN 6915 structural hex nuts. Galvanized Class 8.8 washers are ten times as corrosion resistant as zinc-plated steel washers. Since they are strong and rust resistant, these washers are often used for construction and on building exteriors.
Class 10.9 washers are stronger than Class 8.8 washers. Zinc-plated Class 10.9 washers won’t rust in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Class 8.8 Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
ASME B18.2.6M/ASTM F959 | ||||||||
| M16 | 16.700mm | 33.600mm | 3.200mm-5.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M20 | 20.950mm | 40.650mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 0000 |
| M22 | 23.000mm | 42.900mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M24 | 25.100mm | 48.650mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M27 | 28.350mm | 54.350mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M30 | 31.400mm | 58.400mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
Class 10.9 Steel | ||||||||
ASME B18.2.6M/ASTM F959 | ||||||||
| M12 | 12.550mm | 27.250mm | 2.600mm-4.600mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 10 | 000000000 | 00000 |
| M16 | 16.700mm | 33.600mm | 3.200mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 0000 |
| M20 | 20.950mm | 40.650mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M22 | 23.000mm | 42.900mm | 3.600mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M24 | 25.100mm | 48.650mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M27 | 28.350mm | 54.350mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M30 | 31.400mm | 58.400mm | 4.000mm-7.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M36 | 37.700mm | 70.350mm | 4.800mm-7.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M42 | 44.600mm | 82.000mm | 4.800mm-7.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
Galvanized Class 8.8 Steel | ||||||||
ASME B18.2.6M/ASTM F959 | ||||||||
| M12 | 12.550mm | 27.250mm | 2.600mm-4.600mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 10 | 000000000 | 00000 |
| M16 | 16.700mm | 33.600mm | 3.200mm-5.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 0000 |
| M20 | 20.950mm | 40.640mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M22 | 23.000mm | 42.900mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M24 | 25.100mm | 48.670mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M27 | 28.350mm | 54.360mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M30 | 31.400mm | 58.420mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M36 | 37.700mm | 70.360mm | 4.800mm-7.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
Zinc-Plated Class 10.9 Steel | ||||||||
ASME B18.2.6M/ASTM F959 | ||||||||
| M16 | 16.700mm | 33.600mm | 3.200mm-5.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 0000 |
| M20 | 20.950mm | 40.640mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 5 | 000000000 | 00000 |
| M22 | 23.000mm | 42.900mm | 3.600mm-6.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M24 | 25.100mm | 48.670mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M27 | 28.350mm | 54.360mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M30 | 31.400mm | 58.420mm | 4.000mm-7.000mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |
| M36 | 37.700mm | 70.360mm | 4.800mm-7.500mm | Rockwell C37 | ASME B18.2.6M; ASTM F959 | 1 | 000000000 | 0000 |