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About Washers
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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.
Steel washers are stronger and more wear resistant than stainless steel washers. Zinc-aluminum coated and black ultra-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.
Washers that meet ISO 7089, 7090, 7091, and 7092 (formerly DIN 125, 126, and 433), meet international standards for fastener dimensions.
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. | |
Zinc-Aluminum Coated Class 8.8 Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M4 | 4.3 | 9.0 | 0.7-0.9 | Rockwell B91 | DIN 125, ISO 7089 | 50 | 000000000 | 00000 |
| M5 | 5.3 | 10.0 | 0.9-1.1 | Rockwell B91 | DIN 125, ISO 7089 | 50 | 000000000 | 0000 |
| M6 | 6.4 | 12.0 | 1.4-1.8 | Rockwell B91 | DIN 125, ISO 7089 | 50 | 000000000 | 0000 |
| M8 | 8.4 | 16.0 | 1.4-1.8 | Rockwell B91 | DIN 125, ISO 7089 | 50 | 000000000 | 00000 |
| M10 | 10.5 | 20.0 | 1.8-2.2 | Rockwell B91 | DIN 125, ISO 7089 | 25 | 000000000 | 00000 |
| M12 | 13.0 | 24.0 | 2.3-2.7 | Rockwell B91 | DIN 125, ISO 7089 | 10 | 000000000 | 0000 |
| M14 | 15.0 | 28.0 | 2.3-2.7 | Rockwell B91 | DIN 125, ISO 7089 | 10 | 000000000 | 00000 |
| M16 | 17.0 | 30.0 | 2.7-3.3 | Rockwell B91 | DIN 125, ISO 7089 | 10 | 000000000 | 00000 |
| M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B91 | DIN 125, ISO 7089 | 5 | 000000000 | 00000 |
| M20 | 21.0 | 37.0 | 2.7-3.3 | Rockwell B91 | DIN 125, ISO 7089 | 5 | 000000000 | 00000 |
| M24 | 25.0 | 44.0 | 3.7-4.3 | Rockwell B91 | DIN 125, ISO 7089 | 1 | 000000000 | 0000 |
| M30 | 31.0 | 56.0 | 3.7-4.3 | Rockwell B91 | DIN 125, ISO 7089 | 1 | 000000000 | 0000 |
| M36 | 37.0 | 66.0 | 4.4-5.6 | Rockwell B91 | DIN 125, ISO 7089 | 1 | 000000000 | 00000 |
SAE Washers
SAE washers generally have a smaller ID and OD than USS washers.
Black ultra-corrosion-resistant coated and zinc-aluminum coated steel washers resist chemicals and withstand 1,000 hours of salt spray.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Aluminum Coated Grade 8 Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.158" | 0.380" | 0.036"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 10 | 000000000 | 00000 |
| No. 8 | 0.190" | 0.443" | 0.036"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 10 | 000000000 | 0000 |
| No. 10 | 0.221" | 0.505" | 0.036"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1/4" | 0.281" | 0.625" | 0.055"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.344" | 0.688" | 0.055"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.406" | 0.812" | 0.055"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 7/16" | 0.469" | 0.922" | 0.055"-0.065" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.531" | 1.062" | 0.097"-0.177" | Rockwell C38 | SAE Standards | 25 | 000000000 | 0000 |
| 9/16" | 0.599" | 1.168" | 0.074"-0.121" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 5 | 000000000 | 0000 |
| 5/8" | 0.688" | 1.312" | 0.122"-0.177" | Rockwell C38 | SAE Standards | 25 | 000000000 | 00000 |
| 3/4" | 0.812" | 1.469" | 0.122"-0.177" | Rockwell C38 | SAE Standards | 20 | 000000000 | 00000 |
| 7/8" | 0.950" | 1.762" | 0.136"-0.177" | Rockwell C38 | SAE Standards | 1 | 000000000 | 0000 |
| 1" | 1.074" | 2.012" | 0.136"-0.177" | Rockwell C38 | SAE Standards | 1 | 000000000 | 0000 |
| 1 1/8" | 1.262" | 2.243" | 0.146"-0.177" | Rockwell C38 | SAE Standards | 1 | 000000000 | 0000 |
| 1 1/4" | 1.387" | 2.512" | 0.136"-0.177" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/2" | 1.637" | 3.012" | 0.136"-0.177" | Rockwell C38 | SAE Standards; ASME B18.21.1 | 1 | 000000000 | 00000 |
Split Lock Washers
As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.
Zinc-aluminum-coated steel washers are 40 times as corrosion resistant as zinc-plated washers and comparable to Magni-coated washers.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Aluminum Coated Carbon Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4" | 0.260" | 0.487" | 0.062" | Rockwell C38 | ASME B18.21.1 | 25 | 00000000 | 00000 |
| 5/16" | 0.322" | 0.583" | 0.078" | Rockwell C38 | ASME B18.21.1 | 25 | 00000000 | 0000 |
| 3/8" | 0.385" | 0.680" | 0.094" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 7/16" | 0.450" | 0.776" | 0.109" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 1/2" | 0.512" | 0.869" | 0.125" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 9/16" | 0.574" | 0.965" | 0.141" | Rockwell C38 | ASME B18.21.1 | 5 | 00000000 | 0000 |
| 5/8" | 0.641" | 1.073" | 0.156" | Rockwell C38 | ASME B18.21.1 | 5 | 00000000 | 0000 |
| 3/4" | 0.766" | 1.265" | 0.188" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 7/8" | 0.894" | 1.459" | 0.219" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 1" | 1.024" | 1.656" | 0.250" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 1 1/4" | 1.280" | 2.036" | 0.312" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 00000 |