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Square Washers
Square washers fit into slots and channels and have flat sides to keep them from rotating. They are wider and thicker than most round washers, making them good for distributing heavy loads.
316 stainless steel washers have excellent resistance to chemicals and saltwater. They may be mildly magnetic.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
Zinc-plated steel washers are corrosion resistant in wet environments.
Galvanized steel washers are 10 times as corrosion resistant as zinc-plated steel washers.
For technical drawings and 3-D models, click on a part number.
316 Stainless Steel
| For Screw Size  | ID | Wd. | Thick. | Hardness | Each | |
| No. 8 | 0.187" | 0.500" | 0.048"-0.075" | Not Rated | 000000000 | 00000 |
| No. 8 | 0.187" | 0.547" | 0.034"-0.060" | Not Rated | 000000000 | 0000 |
| No. 8 | 0.188" | 2.000" | 0.056"-0.063" | Rockwell B68 | 000000000 | 0000 |
| No. 10 | 0.219" | 2.000" | 0.056"-0.063" | Rockwell B68 | 000000000 | 0000 |
| No. 12 | 0.265" | 0.438" | 0.048"-0.075" | Not Rated | 000000000 | 0000 |
| 1/4" | 0.285" | 0.500" | 0.114"-0.126" | Rockwell B68 | 000000000 | 0000 |
| 1/4" | 0.285" | 2.000" | 0.056"-0.063" | Rockwell B68 | 000000000 | 0000 |
| 5/16" | 0.375" | 2.000" | 0.090"-0.115" | Not Rated | 000000000 | 0000 |
| 3/8" | 0.406" | 0.750" | 0.114"-0.126" | Rockwell B68 | 000000000 | 0000 |
| 3/8" | 0.406" | 0.813" | 0.114"-0.126" | Rockwell B68 | 000000000 | 0000 |
| 3/8" | 0.438" | 2.000" | 0.115"-0.135" | Not Rated | 000000000 | 0000 |
| 1/2" | 0.530" | 0.813" | 0.115"-0.135" | Not Rated | 000000000 | 0000 |
| 1/2" | 0.531" | 1.250" | 0.100"-0.111" | Rockwell B68 | 000000000 | 0000 |
| 1/2" | 0.562" | 2.000" | 0.020"-0.042" | Not Rated | 000000000 | 0000 |
| 1/2" | 0.562" | 2.000" | 0.090"-0.134" | Not Rated | 000000000 | 0000 |
| 5/8" | 0.656" | 1.250" | 0.090"-0.115" | Not Rated | 000000000 | 0000 |
| 3/4" | 0.812" | 1.250" | 0.100"-0.111" | Rockwell B68 | 000000000 | 0000 |
| 3/4" | 0.812" | 2.000" | 0.114"-0.126" | Rockwell B68 | 000000000 | 0000 |
18-8 Stainless Steel
| For Screw Size | ID | Wd. | Thick. | Hardness | Each | |
| No. 10 | 0.219" | 2.000" | 0.056"-0.063" | Rockwell B68 | 000000000 | 00000 |
| 1/4" | 0.313" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 5/16" | 0.343" | 2.000" | 0.056"-0.063" | Rockwell B68 | 000000000 | 0000 |
| 3/8" | 0.438" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 7/16" | 0.500" | 2.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 0000 |
| 1/2" | 0.563" | 2.000" | 0.112"-0.128" | Rockwell B84 | 000000000 | 0000 |
| 1/2" | 0.563" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 1/2" | 0.563" | 3.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 00000 |
| 5/8" | 0.688" | 2.000" | 0.112"-0.128" | Rockwell B84 | 000000000 | 0000 |
| 5/8" | 0.688" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 5/8" | 0.688" | 3.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 00000 |
| 3/4" | 0.813" | 2.000" | 0.112"-0.128" | Rockwell B84 | 000000000 | 0000 |
| 3/4" | 0.813" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 3/4" | 0.813" | 3.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 7/8" | 0.938" | 3.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 00000 |
| 1" | 1.063" | 2.000" | 0.235"-0.265" | Rockwell B83 | 000000000 | 0000 |
| 1" | 1.063" | 3.000" | 0.235"-0.265" | Rockwell B84 | 000000000 | 00000 |
| 1 1/4" | 1.313" | 2.000" | 0.235"-0.265" | Rockwell B70 | 000000000 | 0000 |
| 1 1/4" | 1.313" | 3.000" | 0.220"-0.280" | Rockwell B84 | 000000000 | 00000 |
| M6 | 9.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M8 | 11.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M10 | 13.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M12 | 16.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M14 | 18.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M16 | 22.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M20 | 26.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M22 | 28.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M24 | 32.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
| M30 | 38.000mm | 50.000mm | 6.000mm | Rockwell B84 | 000000000 | 00000 |
Black-Oxide Steel
| For Screw Size | ID | Wd. | Thick. | Hardness | Each | |
| No. 10 | 0.219" | 2.000" | 0.054"-0.066" | Rockwell B40 | 000000000 | 00000 |
| 1/4" | 0.312" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 5/16" | 0.343" | 2.000" | 0.054"-0.066" | Rockwell B40 | 000000000 | 0000 |
| 3/8" | 0.438" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 7/16" | 0.500" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 1/2" | 0.562" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 1/2" | 0.562" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 5/8" | 0.688" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 5/8" | 0.688" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 5/8" | 0.688" | 4.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 3/4" | 0.812" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 3/4" | 0.812" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 3/4" | 0.812" | 4.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 7/8" | 0.938" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 7/8" | 0.938" | 4.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 1" | 1.062" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 1" | 1.062" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 1" | 1.062" | 4.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 2.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 0000 |
| 1 1/4" | 1.312" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 4.000" | 0.220"-0.280" | Rockwell 15N80 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 4.000" | 0.220"-0.280" | Rockwell 15N80 | 000000000 | 00000 |
| 1 3/4" | 1.812" | 4.000" | 0.220"-0.280" | Rockwell 15N80 | 000000000 | 00000 |
| 1 3/4" | 1.938" | 3.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| 2" | 2.062" | 4.000" | 0.235"-0.265" | Rockwell 15N80 | 000000000 | 00000 |
| M6 | 9.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M8 | 11.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M10 | 13.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M12 | 16.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M14 | 18.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M16 | 22.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M20 | 26.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M22 | 28.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M24 | 32.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
| M30 | 38.000mm | 50.000mm | 6.000mm | Rockwell 15N80 | 000000000 | 0000 |
Zinc-Plated Steel
| For Screw Size | ID | Wd. | Thick. | Hardness | Pkg. Qty. | Pkg. | |
| No. 4 | 0.125" | 0.500" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 000000 |
| No. 4 | 0.125" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 4 | 0.125" | 2.000" | 0.054"-0.066" | Rockwell B40 | 5 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.500" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 6 | 0.156" | 2.000" | 0.054"-0.066" | Rockwell B40 | 5 | 000000000 | 00000 |
| No. 8 | 0.188" | 0.500" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 8 | 0.188" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 8 | 0.188" | 2.000" | 0.054"-0.066" | Rockwell B40 | 5 | 000000000 | 00000 |
| No. 10 | 0.219" | 0.500" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 10 | 0.219" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| No. 10 | 0.219" | 2.000" | 0.054"-0.066" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/4" | 0.285" | 1.000" | 0.054"-0.066" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/4" | 0.285" | 1.500" | 0.054"-0.066" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/4" | 0.312" | 0.750" | 0.110"-0.130" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/4" | 0.312" | 2.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/16" | 0.343" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| 5/16" | 0.375" | 0.875" | 0.120"-0.140" | Rockwell B40 | 10 | 000000000 | 00000 |
| 5/16" | 0.375" | 1.750" | 0.125"-0.145" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/16" | 0.375" | 2.000" | 0.125"-0.145" | Rockwell B40 | 5 | 000000000 | 00000 |
| 3/8" | 0.406" | 0.750" | 0.042"-0.051" | Rockwell B40 | 10 | 000000000 | 00000 |
| 3/8" | 0.406" | 1.375" | 0.112"-0.127" | Rockwell B40 | 10 | 000000000 | 00000 |
| 3/8" | 0.406" | 3.000" | 0.112"-0.127" | Rockwell B40 | 1 | 000000000 | 0000 |
| 3/8" | 0.438" | 1.000" | 0.120"-0.140" | Rockwell B40 | 10 | 000000000 | 00000 |
| 3/8" | 0.438" | 1.500" | 0.115"-0.135" | Rockwell B40 | 5 | 000000000 | 00000 |
| 3/8" | 0.438" | 2.000" | 0.110"-0.140" | Rockwell B40 | 5 | 000000000 | 00000 |
| 3/8" | 0.438" | 2.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 7/16" | 0.469" | 2.000" | 0.112"-0.127" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.531" | 1.000" | 0.097"-0.113" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/2" | 0.531" | 1.500" | 0.112"-0.127" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/2" | 0.531" | 1.750" | 0.112"-0.127" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.562" | 1.375" | 0.170"-0.200" | Rockwell B40 | 10 | 000000000 | 00000 |
| 1/2" | 0.562" | 2.000" | 0.025"-0.040" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.562" | 2.000" | 0.105"-0.135" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.562" | 2.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.562" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 5/8" | 0.656" | 1.375" | 0.112"-0.127" | Rockwell B40 | 10 | 000000000 | 00000 |
| 5/8" | 0.688" | 1.750" | 0.170"-0.200" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/8" | 0.688" | 2.000" | 0.112"-0.128" | Rockwell B40 | 1 | 000000000 | 0000 |
| 5/8" | 0.688" | 2.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/8" | 0.688" | 3.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/8" | 0.688" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 3/4" | 0.812" | 2.000" | 0.112"-0.128" | Rockwell B40 | 1 | 000000000 | 0000 |
| 3/4" | 0.812" | 2.000" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 3/4" | 0.812" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 3/4" | 0.812" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 0000 |
| 7/8" | 0.938" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 7/8" | 0.938" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1" | 1.062" | 1.750" | 0.225"-0.265" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1" | 1.062" | 2.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 0000 |
| 1" | 1.062" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1" | 1.062" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 2.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.312" | 2.500" | 0.110"-0.140" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 3/4" | 1.812" | 3.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 1 3/4" | 1.812" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
| 2" | 2.062" | 4.000" | 0.220"-0.280" | Rockwell B40 | 1 | 000000000 | 00000 |
Galvanized Steel
| For Screw Size | ID | Wd. | Thick. | Hardness | Each | |
| 1/4" | 0.312" | 2.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 5/16" | 0.343" | 2.000" | 0.054"-0.070" | Rockwell B40 | 000000000 | 0000 |
| 3/8" | 0.438" | 2.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 1/2" | 0.562" | 2.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 1/2" | 0.562" | 3.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 5/8" | 0.688" | 2.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 5/8" | 0.688" | 3.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 5/8" | 0.688" | 4.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 00000 |
| 3/4" | 0.812" | 2.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 3/4" | 0.812" | 3.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 3/4" | 0.812" | 4.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 7/8" | 0.938" | 3.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 7/8" | 0.938" | 4.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 00000 |
| 1" | 1.062" | 2.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 0000 |
| 1" | 1.062" | 3.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 0000 |
| 1" | 1.062" | 4.000" | 0.235"-0.265" | Rockwell B40 | 000000000 | 00000 |
| 1 1/4" | 1.312" | 2.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 0000 |
| 1 1/4" | 1.312" | 3.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 0000 |
| 1 1/4" | 1.312" | 4.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 3.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 1 1/2" | 1.562" | 4.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 1 3/4" | 1.812" | 4.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 1 3/4" | 1.938" | 3.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| 2" | 2.062" | 4.000" | 0.220"-0.280" | Rockwell B40 | 000000000 | 00000 |
| M6 | 9.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M8 | 11.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M10 | 13.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M12 | 16.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M14 | 18.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M16 | 22.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M20 | 26.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M22 | 28.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M24 | 32.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |
| M30 | 38.000mm | 50.000mm | 6.000mm | Rockwell B40 | 000000000 | 0000 |