System of Measurement System of Measurement |
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For Screw Size For Screw Size |
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Material Material |
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Finish Finish |
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Tooth Location Tooth Location |
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 | External |
Washer Type Washer Type |
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 | Tooth Lock |
ID ID |
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OD OD |
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Thickness Thickness |
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Specifications Met Specifications Met |
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Hardness Hardness |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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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
More
External-Tooth Lock Washers
Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
400 series stainless steel washers have excellent wear resistance, but aren’t as corrosion resistant as other stainless steel washers. They 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.
Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards. The zinc-plated 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. | |
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 10 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 10 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 10 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 10 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| No. 2 | 0.086" | 0.189" | 0.010"-0.013" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.475" | 0.020"-0.027" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.513" | 0.900" | 0.037"-0.045" | Not Rated | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/8" | 0.641" | 1.070" | 0.042"-0.050" | Rockwell B88 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 3/4" | 0.768" | 1.260" | 0.047"-0.055" | Rockwell B88 | ASME B18.21.1 | 5 | 000000000 | 0000 |
Black-Oxide 18-8 Stainless Steel | ||||||||
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell B88 | ASME B18.21.1 | 100 | 000000000 | 00000 |
400 Series Stainless Steel | ||||||||
| No. 2 | 0.096" | 0.195" | 0.010"-0.016" | Rockwell C34 | __ | 100 | 000000000 | 0000 |
| No. 3 | 0.102" | 0.235" | 0.010"-0.016" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.129" | 0.285" | 0.014"-0.020" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.475" | 0.020"-0.027" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 7/16" | 0.448" | 0.760" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 1/2" | 0.513" | 0.900" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/8" | 0.641" | 1.070" | 0.042"-0.050" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 3/4" | 0.768" | 1.260" | 0.047"-0.055" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 00000 |
410 Stainless Steel | ||||||||
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 7/8" | 0.897" | 1.410" | 0.052"-0.060" | Rockwell C34 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 1" | 1.025" | 1.620" | 0.059"-0.067" | Rockwell C34 | ASME B18.21.1 | 5 | 000000000 | 00000 |
Black-Oxide Steel | ||||||||
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.475" | 0.020"-0.027" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 1/2" | 0.513" | 0.900" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
Zinc-Plated Steel | ||||||||
| No. 2 | 0.086" | 0.195" | 0.010"-0.016" | Rockwell C40 | __ | 100 | 000000000 | 0000 |
| No. 3 | 0.102" | 0.235" | 0.010"-0.016" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 12 | 0.221" | 0.475" | 0.020"-0.027" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.760" | 0.032"-0.040" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/2" | 0.513" | 0.900" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/8" | 0.641" | 1.070" | 0.042"-0.050" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/4" | 0.768" | 1.260" | 0.047"-0.055" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 7/8" | 0.897" | 1.410" | 0.052"-0.060" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1" | 1.025" | 1.620" | 0.059"-0.067" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 00000 |
Bronze | ||||||||
| No. 3 | 0.102" | 0.235" | 0.010"-0.016" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.260" | 0.012"-0.018" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.410" | 0.018"-0.024" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.475" | 0.020"-0.027" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell B60 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell B60 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 7/16" | 0.448" | 0.760" | 0.032"-0.040" | Rockwell B60 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.513" | 0.900" | 0.037"-0.045" | Rockwell B60 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/8" | 0.641" | 1.070" | 0.042"-0.050" | Rockwell B60 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.768" | 1.260" | 0.047"-0.055" | Rockwell B60 | ASME B18.21.1 | 5 | 000000000 | 0000 |