For Screw Size For Screw Size |
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Material Material |
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Washer Type Washer Type |
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| Tooth Lock | Countersunk |
ID ID |
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OD OD |
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Minimum Thickness Minimum Thickness |
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Maximum Thickness Maximum Thickness |
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Specifications Met Specifications Met |
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Hardness Hardness |
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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.
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. | |
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. 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 |
| 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 |
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 | 0000 |
| 3/4" | 0.768" | 1.260" | 0.047"-0.055" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 00000 |
Metric 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.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| M3 | 3.2 | 6.0 | 0.3-0.5 | DIN 6797 | 100 | 000000000 | 00000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | DIN 6797 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | DIN 6797 | 100 | 000000000 | 00000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | DIN 6797 | 50 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | DIN 6797 | 50 | 000000000 | 00000 |
| M18 | 19.0 | 30.0 | 1.2-1.6 | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.6 | DIN 6797 | 10 | 000000000 | 0000 |
Mil. Spec. External-Tooth Lock Washers
Choose these washers for their adherence to strict military standards for material and construction. 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. Made from 410 stainless steel, these washers have excellent wear resistance.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
410 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS-35335/NASM 35335 | ||||||||
| No. 4 | 0.115" | 0.260" | 0.015"-0.019" | Rockwell C40 | ASME B18.21.1; MS35335-57; NASM35335 | 25 | 000000000 | 000000 |
| No. 6 | 0.141" | 0.320" | 0.016"-0.022" | Rockwell C40 | ASME B18.21.1; MS35335-58; NASM35335 | 25 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.381" | 0.018"-0.023" | Rockwell C40 | ASME B18.21.1; MS35335-59; NASM35335 | 25 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.410" | 0.020"-0.025" | Rockwell C40 | ASME B18.21.1; MS35335-60; NASM35335 | 25 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.510" | 0.023"-0.028" | Rockwell C40 | ASME B18.21.1; MS35335-61; NASM35335 | 25 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell C40 | ASME B18.21.1; MS35335-62; NASM35335 | 25 | 000000000 | 00000 |
| 3/8" | 0.384" | 0.694" | 0.032"-0.040" | Rockwell C40 | ASME B18.21.1; MS35335-63; NASM35335 | 25 | 000000000 | 00000 |
Tight-Grip External-Tooth Lock Washers
The teeth on these washers bite further into the screw head and joint than standard external-tooth washers to provide a stronger hold. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| M3 | 3.2 | 6.0 | 0.3-0.5 | DIN 6798 | 100 | 000000000 | 00000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | DIN 6798 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | DIN 6798 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | DIN 6798 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | DIN 6798 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | DIN 6798 | 100 | 000000000 | 00000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | DIN 6798 | 50 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | DIN 6798 | 50 | 000000000 | 00000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | DIN 6798 | 10 | 000000000 | 0000 |
| M24 | 25.0 | 38.0 | 1.4-1.6 | DIN 6798 | 10 | 000000000 | 0000 |
Countersunk External-Tooth Lock Washers
The teeth on these washers firmly grip heads of 82° flat head countersunk screws to prevent joints from loosening under vibration.
400 series stainless steel washers have excellent wear resistance and may be mildly magnetic.
Washers meet ASME B18.21.1 dimensional standards.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Countersink Angle | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
400 Series Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.140" | 0.289" | 0.017"-0.021" | 82° | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 8 | 0.167" | 0.322" | 0.017"-0.021" | 82° | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.354" | 0.020"-0.025" | 82° | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/4" | 0.255" | 0.454" | 0.020"-0.025" | 82° | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
Internal-Tooth Lock Washers
Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese 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.
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 | Thickness | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 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" | 0.692" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40 | ASME B18.21.1 | 5 | 000000000 | 0000 |
400 Series Stainless Steel | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.016" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 3 | 0.102" | 0.232" | 0.010"-0.016" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.129" | 0.280" | 0.014"-0.020" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.410" | 0.020"-0.027" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 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" | 0.692" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 00000 |
Metric Internal-Tooth Lock Washers
Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| M2 | 2.2 | 4.5 | 0.2-0.4 | DIN 6797 | 100 | 000000000 | 00000 |
| M2.5 | 2.7 | 5.5 | 0.2-0.5 | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | DIN 6797 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | DIN 6797 | 50 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | DIN 6797 | 50 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | DIN 6797 | 25 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.5 | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | DIN 6797 | 10 | 000000000 | 0000 |
Mil. Spec. Internal-Tooth Lock Washers
Choose these washers for their adherence to strict military standards for material and construction. Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.
410 stainless steel washers have excellent wear resistance.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
410 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell C40-50 | ASME B18.21.1; MS-35333-69; NASM 35333-69 | 25 | 000000000 | 00000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell C40-50 | ASME B18.21.1; MS-35333-70; NASM 35333-70 | 25 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell C40-50 | ASME B18.21.1; MS-35333-71; NASM 35333-71 | 25 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C40-50 | ASME B18.21.1; MS-35333-72; NASM 35333-72 | 25 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell C40-50 | ASME B18.21.1; MS-35333-73; NASM 35333-73 | 25 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C40-50 | ASME B18.21.1; MS-35333-74; NASM 35333-74 | 25 | 000000000 | 00000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell C40-50 | ASME B18.21.1; MS-35333-75; NASM 35333-75 | 25 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-76; NASM 35333-76 | 25 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-77; NASM 35333-77 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40-50 | ASME B18.21.1; MS-35333-78; NASM 35333-78 | 10 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40-50 | ASME B18.21.1; MS-35333-80; NASM 35333-80 | 10 | 000000000 | 00000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40-50 | ASME B18.21.1; MS-35333-81; NASM 35333-81 | 5 | 000000000 | 00000 |
| 7/8" | 0.894" | 1.410" | 0.052"-0.060" | Rockwell C40-50 | ASME B18.21.1; MS-35333-82; NASM 35333-82 | 5 | 000000000 | 00000 |