Thickness Thickness |
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OD OD |
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ID ID |
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Material Material |
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Washer Type Washer Type |
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| Flat | Split Lock |
Hardness Hardness |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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About Washers
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Metric Oversized Washers
Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.
Blue-dyed steel washers have a unique color so you can tell they're metric at a glance.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Hardness | Pkg. Qty. | Pkg. | |
Blue-Dyed Steel | |||||||
|---|---|---|---|---|---|---|---|
| M6 | 7.0 | 13.0 | 2.7-4.0 | Rockwell C38 | 25 | 000000000 | 000000 |
| M8 | 9.0 | 19.0 | 2.7-4.0 | Rockwell C38 | 50 | 000000000 | 00000 |
| M10 | 11.0 | 20.0 | 3.0-4.2 | Rockwell C38 | 25 | 000000000 | 00000 |
| M12 | 14.0 | 25.0 | 3.1-4.2 | Rockwell C38 | 10 | 000000000 | 0000 |
| M16 | 18.0 | 32.0 | 3.1-4.2 | Rockwell C38 | 5 | 000000000 | 0000 |
| M20 | 22.0 | 39.0 | 3.1-4.2 | Rockwell C38 | 5 | 000000000 | 0000 |
| M24 | 26.0 | 44.0 | 3.4-4.6 | Rockwell C38 | 5 | 000000000 | 00000 |
| M30 | 33.0 | 60.0 | 3.4-4.6 | Rockwell C38 | 1 | 000000000 | 0000 |
| M36 | 39.0 | 71.0 | 4.1-4.6 | Rockwell C38 | 1 | 000000000 | 0000 |
Metric General Purpose Washers
Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.
Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. 18-8 and 17-7 PH stainless steel washers will hold up in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel. Black-oxide 18-8 stainless steel washers have a matte-black finish. More corrosion resistant than 18-8 and 17-7 PH stainless steel, 316 stainless steel washers will not corrode from salt water, chlorine solutions, and chemicals. Stronger and slightly more corrosion resistant than 316 stainless steel, Bumax 109 stainless steel washers are best for marine environments and chemical-processing plants.
Steel washers are stronger and more wear resistant than stainless steel washers. Steel washers without a plating or coating are best for dry environments, since moisture will cause them to rust. Zinc-plated steel washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Although they are stronger and more wear resistant than stainless steel, they are not as corrosion resistant. Use them in wet environments, but avoid contact with salt water and chemicals. Zinc-flake-coated and black corrosion-resistant-coated steel washers have the same level of corrosion resistance—both resist corrosion from chemicals and withstand 1,000 hours of salt spray. The black corrosion-resistant-coated steel washers have a black semi-gloss finish.
At one-third the weight of steel, aluminum washers are the lightest option. They will not rust in wet environments.
In addition to resisting rust in wet environments, copper and brass washers are electrically conductive.
Washers that meet ISO 7089, 7090, 7091, and 7092 (formerly DIN 125, 126, and 433), meet international standards for fastener dimensions. The ISO 7091 washers have a slightly rougher surface than a typical flat washer.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thickness, mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Bumax 109 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M6 | 6.4 | 12.0 | 1.4-1.8 | Rockwell C30 | DIN 125; ISO 7089 | 10 | 000000000 | 00000 |
| M8 | 8.4 | 16.0 | 1.4-1.8 | Rockwell C30 | DIN 125; ISO 7089 | 10 | 000000000 | 0000 |
| M10 | 10.5 | 20.0 | 1.8-2.2 | Rockwell C30 | DIN 125; ISO 7089 | 5 | 000000000 | 0000 |
| M12 | 13.0 | 24.0 | 2.3-2.7 | Rockwell C30 | DIN 125; ISO 7089 | 5 | 000000000 | 00000 |
Metric Split Lock Washers
As you tighten a bolt, these metric washers flatten to add tension to the threaded joint and prevent loosening from small amounts of vibration. They meet a DIN or ASME standard for split lock washer dimensions.
Standard split lock washers match with fasteners that have right-hand threads to prevent clockwise rotation. They have uneven split ends that bite into fasteners for a tight grip but won’t work with hardened surfaces. They hold better than curved or wave washers. These washers are not reusable after tightening.
Steel washers are stronger and resist wear better than zinc-plated steel and stainless steel washers. Use them in dry environments. Blue-dyed steel washers are easy to spot.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Blue-Dyed Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
Standard | ||||||||
| M6 | 6.2 | 12.1 | 2.0 | Rockwell C38 | ASME B18.21.2M | 100 | 000000000 | 00000 |
| M8 | 8.2 | 15.2 | 2.5 | Rockwell C38 | ASME B18.21.2M | 100 | 000000000 | 0000 |
| M10 | 10.2 | 18.0 | 2.9 | Rockwell C38 | ASME B18.21.2M | 50 | 000000000 | 0000 |
| M12 | 12.3 | 21.7 | 3.8 | Rockwell C38 | ASME B18.21.2M | 100 | 000000000 | 00000 |
| M16 | 16.4 | 27.9 | 4.8 | Rockwell C38 | ASME B18.21.2M | 25 | 000000000 | 00000 |
| M20 | 20.5 | 33.8 | 5.7 | Rockwell C38 | ASME B18.21.2M | 10 | 000000000 | 0000 |
| M24 | 24.5 | 40.7 | 7.2 | Rockwell C38 | ASME B18.21.2M | 10 | 000000000 | 00000 |