About Washers
More
Split Lock Washers for Socket Head Screws
Also known as high-collar lock washers, these have smaller outside diameters than standard split lock washers to fit neatly under socket head cap screws. As a screw is tightened, they flatten to add tension to the joint and prevent loosening from small amounts of vibration.
Black-oxide steel washers are mildly corrosion resistant in dry environments. Zinc-plated steel washers are corrosion resistant in wet environments.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic. Black-oxide 18-8 stainless steel washers have a matte black finish.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards. Steel washers also meet standards for material properties.
For technical drawings and 3-D models, click on a part number.
| For Screw Size  | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 8 | 0.174" | 0.267" | 0.042" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 7/16" | 0.450" | 0.644" | 0.140" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C38 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 7/8" | 0.984" | 1.291" | 0.234" | Rockwell C38 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 1" | 1.024" | 1.478" | 0.250" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.280" | 1.790" | 0.313" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/8" | 1.153" | 1.663" | 0.313" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
Zinc-Plated Steel | ||||||||
| No. 6 | 0.148" | 0.216" | 0.030" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.267" | 0.042" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 7/16" | 0.450" | 0.644" | 0.140" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 7/8" | 0.984" | 1.291" | 0.234" | Rockwell C38 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 1" | 1.024" | 1.478" | 0.250" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
| No. 2 | 0.094" | 0.142" | 0.022" | Rockwell C35 | __ | 100 | 000000000 | 0000 |
| No. 4 | 0.120" | 0.173" | 0.022" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.133" | 0.202" | 0.030" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.148" | 0.216" | 0.030" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.267" | 0.047" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.227" | 0.331" | 0.078" | Rockwell C35 | __ | 100 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 7/16" | 0.450" | 0.644" | 0.140" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C35 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.291" | 0.234" | Rockwell C35 | ASME B18.21.1 | 5 | 000000000 | 00000 |
| 1" | 1.024" | 1.478" | 0.250" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 0000 |
Black-Oxide 18-8 Stainless Steel | ||||||||
| No. 4 | 0.120" | 0.173" | 0.022" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.148" | 0.216" | 0.030" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.267" | 0.047" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C35 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C35 | ASME B18.21.1 | 5 | 000000000 | 00000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 0000 |
316 Stainless Steel | ||||||||
| No. 2 | 0.094" | 0.142" | 0.022" | Rockwell C35 | __ | 100 | 000000000 | 0000 |
| No. 4 | 0.120" | 0.173" | 0.022" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.133" | 0.202" | 0.030" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.148" | 0.216" | 0.030" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.267" | 0.047" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C35 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 7/16" | 0.450" | 0.644" | 0.140" | Rockwell C35 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C35 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C35 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.291" | 0.234" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1" | 1.024" | 1.478" | 0.250" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.280" | 1.790" | 0.313" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/2" | 1.534" | 2.159" | 0.375" | Rockwell C35 | ASME B18.21.1 | 1 | 000000000 | 00000 |
Steel | ||||||||
| No. 4 | 0.120" | 0.173" | 0.022" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.133" | 0.202" | 0.030" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.148" | 0.216" | 0.030" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.267" | 0.047" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.200" | 0.294" | 0.047" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.363" | 0.078" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.457" | 0.093" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.550" | 0.125" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 7/16" | 0.450" | 0.644" | 0.140" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.733" | 0.172" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/8" | 0.641" | 0.917" | 0.203" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/4" | 0.766" | 1.105" | 0.218" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.291" | 0.234" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1" | 1.024" | 1.478" | 0.250" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 0000 |