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About Washers
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Mil. Spec. Split Lock Washers
Choose these washers for their adherence to strict military standards for material and construction. As a screw is tightened, they flatten to add tension to the joint and prevent loosening from small amounts of vibration.
18-8 stainless steel washers have excellent corrosion resistance in most environments. They may be mildly magnetic. Passivated 18-8 stainless steel washers have added protection against oxidation and corrosion. Black-oxide 18-8 stainless steel washers have a matte-black finish.
Cadmium- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS35338 | ||||||||
| No. 2 | 0.094" | 0.172" | 0.020" | Rockwell C35 | ASME B18.21.1; MS35338-134 | 100 | 000000000 | 00000 |
| No. 4 | 0.120" | 0.209" | 0.025" | Rockwell C35 | ASME B18.21.1; MS35338-135 | 100 | 000000000 | 0000 |
| No. 6 | 0.148" | 0.250" | 0.031" | Rockwell C35 | ASME B18.21.1; MS35338-136 | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.293" | 0.040" | Rockwell C35 | ASME B18.21.1; MS35338-137 | 100 | 000000000 | 0000 |
| No. 10 | 0.200" | 0.334" | 0.047" | Rockwell C35 | ASME B18.21.1; MS35338-138 | 100 | 000000000 | 0000 |
| 1/4" | 0.260" | 0.487" | 0.062" | Rockwell C35 | ASME B18.21.1; MS35338-139 | 50 | 000000000 | 0000 |
| 5/16" | 0.322" | 0.583" | 0.078" | Rockwell C35 | ASME B18.21.1; MS35338-140 | 25 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.680" | 0.094" | Rockwell C35 | ASME B18.21.1; MS35338-141 | 25 | 000000000 | 0000 |
| 7/16" | 0.440" | 0.776" | 0.109" | Rockwell C35 | ASME B18.21.1; MS35338-142 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.869" | 0.125" | Rockwell C35 | ASME B18.21.1; MS35338-143 | 10 | 000000000 | 0000 |
| 9/16" | 0.564" | 0.965" | 0.141" | Rockwell C35 | ASME B18.21.1; MS35338-144 | 10 | 000000000 | 0000 |
| 5/8" | 0.641" | 1.072" | 0.156" | Rockwell C35 | ASME B18.21.1; MS35338-145 | 10 | 000000000 | 00000 |
| 3/4" | 0.766" | 1.264" | 0.188" | Rockwell C35 | ASME B18.21.1; MS35338-146 | 5 | 000000000 | 0000 |
| 1" | 1.003" | 1.656" | 0.250" | Rockwell C35 | ASME B18.21.1; MS35338-148 | 2 | 000000000 | 0000 |
| 1 1/4" | 1.254" | 2.036" | 0.312" | Rockwell C35 | ASME B18.21.1; MS35338-150 | 1 | 000000000 | 0000 |
| 1 1/8" | 1.129" | 1.847" | 0.281" | Rockwell C35 | ASME B18.21.1; MS35338-149 | 1 | 000000000 | 0000 |
Black Oxide 18-8 Stainless Steel | ||||||||
MS35338 | ||||||||
| No. 2 | 0.094" | 0.172" | 0.020" | Rockwell C35 | ASME B18.21.1; MS35338-134 | 100 | 000000000 | 0000 |
| No. 4 | 0.114" | 0.209" | 0.025" | Rockwell C35 | ASME B18.21.1; MS35338-135 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.250" | 0.031" | Rockwell C35 | ASME B18.21.1; MS35338-136 | 100 | 000000000 | 0000 |
| No. 8 | 0.167" | 0.293" | 0.040" | Rockwell C35 | ASME B18.21.1; MS35338-137 | 100 | 000000000 | 0000 |
| No. 10 | 0.193" | 0.334" | 0.047" | Rockwell C35 | ASME B18.21.1; MS35338-138 | 100 | 000000000 | 0000 |
| 1/4" | 0.252" | 0.487" | 0.062" | Rockwell C35 | ASME B18.21.1; MS35338-139 | 50 | 000000000 | 0000 |
| 5/16" | 0.314" | 0.583" | 0.078" | Rockwell C35 | ASME B18.21.1; MS35338-140 | 50 | 000000000 | 0000 |
| 3/8" | 0.377" | 0.680" | 0.094" | Rockwell C35 | ASME B18.21.1; MS35338-141 | 10 | 000000000 | 0000 |
| 7/16" | 0.440" | 0.776" | 0.109" | Rockwell C35 | ASME B18.21.1; MS35338-142 | 10 | 000000000 | 0000 |
| 1/2" | 0.502" | 0.869" | 0.125" | Rockwell C35 | ASME B18.21.1; MS35338-143 | 10 | 000000000 | 0000 |
| 9/16" | 0.564" | 0.965" | 0.141" | Rockwell C35 | ASME B18.21.1; MS35338-144 | 2 | 000000000 | 0000 |
| 5/8" | 0.628" | 1.073" | 0.156" | Rockwell C35 | ASME B18.21.1; MS35338-145 | 2 | 000000000 | 0000 |
Cadmium-Plated Steel | ||||||||
MS35338 | ||||||||
| No. 2 | 0.094" | 0.172" | 0.020" | Rockwell C38 | ASME B18.21.1; MS35338-39 | 50 | 000000000 | 0000 |
| No. 4 | 0.114" | 0.209" | 0.025" | Rockwell C38 | ASME B18.21.1; MS35338-40 | 50 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.250" | 0.031" | Rockwell C38 | ASME B18.21.1; MS35338-41 | 50 | 000000000 | 0000 |
| No. 8 | 0.167" | 0.293" | 0.040" | Rockwell C38 | ASME B18.21.1; MS35338-42 | 50 | 000000000 | 0000 |
| No. 10 | 0.193" | 0.334" | 0.047" | Rockwell C38 | ASME B18.21.1; MS35338-43 | 50 | 000000000 | 0000 |
| 1/4" | 0.252" | 0.487" | 0.062" | Rockwell C38 | ASME B18.21.1; MS35338-44 | 50 | 000000000 | 0000 |
| 5/16" | 0.314" | 0.583" | 0.078" | Rockwell C38 | ASME B18.21.1; MS35338-45 | 50 | 000000000 | 0000 |
| 3/8" | 0.377" | 0.680" | 0.094" | Rockwell C38 | ASME B18.21.1; MS35338-46 | 25 | 000000000 | 0000 |
| 7/16" | 0.440" | 0.776" | 0.109" | Rockwell C38 | ASME B18.21.1; MS35338-47 | 25 | 000000000 | 0000 |
| 1/2" | 0.502" | 0.869" | 0.125" | Rockwell C38 | ASME B18.21.1; MS35338-48 | 10 | 000000000 | 0000 |
| 9/16" | 0.564" | 0.965" | 0.141" | Rockwell C38 | ASME B18.21.1; MS35338-49 | 5 | 000000000 | 0000 |
| 5/8" | 0.628" | 1.073" | 0.156" | Rockwell C38 | ASME B18.21.1; MS35338-50 | 2 | 000000000 | 0000 |
Zinc Yellow-Chromate Plated Steel | ||||||||
MS35338 | ||||||||
| No. 2 | 0.094" | 0.172" | 0.020" | Rockwell C38 | ASME B18.21.1; MS35338-39 | 100 | 000000000 | 0000 |
| No. 4 | 0.114" | 0.209" | 0.025" | Rockwell C38 | ASME B18.21.1; MS35338-40 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.250" | 0.031" | Rockwell C38 | ASME B18.21.1; MS35338-41 | 100 | 000000000 | 0000 |
| No. 8 | 0.167" | 0.293" | 0.040" | Rockwell C38 | ASME B18.21.1; MS35338-42 | 100 | 000000000 | 0000 |
| No. 10 | 0.193" | 0.334" | 0.047" | Rockwell C38 | ASME B18.21.1; MS35338-43 | 100 | 000000000 | 0000 |
| 1/4" | 0.252" | 0.487" | 0.062" | Rockwell C38 | ASME B18.21.1; MS35338-44 | 50 | 000000000 | 0000 |
| 5/16" | 0.314" | 0.583" | 0.078" | Rockwell C38 | ASME B18.21.1; MS35338-45 | 50 | 000000000 | 0000 |
| 3/8" | 0.377" | 0.680" | 0.094" | Rockwell C38 | ASME B18.21.1; MS35338-46 | 25 | 000000000 | 0000 |
| 7/16" | 0.440" | 0.776" | 0.109" | Rockwell C38 | ASME B18.21.1; MS35338-47 | 25 | 000000000 | 0000 |
| 1/2" | 0.502" | 0.869" | 0.125" | Rockwell C38 | ASME B18.21.1; MS35338-48 | 10 | 000000000 | 0000 |
| 9/16" | 0.564" | 0.965" | 0.141" | Rockwell C38 | ASME B18.21.1; MS35338-49 | 10 | 000000000 | 0000 |
| 5/8" | 0.628" | 1.073" | 0.156" | Rockwell C38 | ASME B18.21.1; MS35338-50 | 10 | 000000000 | 0000 |
| 7/8" | 0.878" | 1.459" | 0.219" | Rockwell C38 | ASME B18.21.1; MS35338-52 | 5 | 000000000 | 0000 |
| 1" | 1.003" | 1.656" | 0.250" | Rockwell C38 | ASME B18.21.1; MS35338-53 | 3 | 000000000 | 0000 |
| 1 1/2" | 1.504" | 2.419" | 0.375" | Rockwell C38 | ASME B18.21.1; MS35338-57 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.254" | 2.036" | 0.312" | Rockwell C38 | ASME B18.21.1; MS35338-55 | 2 | 000000000 | 0000 |
| 1 1/8" | 1.129" | 1.847" | 0.281" | Rockwell C38 | ASME B18.21.1; MS35338-54 | 3 | 000000000 | 0000 |
| 1 3/8" | 1.397" | 2.219" | 0.344" | Rockwell C38 | ASME B18.21.1; MS35338-56 | 2 | 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.
Cadmium-plated steel washers are corrosion resistant in wet environments.
Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
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. | |
Cadmium-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell C40-50 | ASME B18.21.1; MS-35333-35; NASM 35333-35 | 25 | 000000000 | 00000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell C40-50 | ASME B18.21.1; MS-35333-36; NASM 35333-36 | 25 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell C40-50 | ASME B18.21.1; MS-35333-37; NASM 35333-37 | 25 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C40-50 | ASME B18.21.1; MS-35333-38; NASM 35333-38 | 25 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell C40-50 | ASME B18.21.1; MS-35333-39; NASM 35333-39 | 25 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C40-50 | ASME B18.21.1; MS-35333-40; NASM 35333-40 | 25 | 000000000 | 0000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell C40-50 | ASME B18.21.1; MS-35333-41; NASM 35333-41 | 25 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-42; NASM 35333-42 | 25 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-43; NASM 35333-43 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40-50 | ASME B18.21.1; MS-35333-44; NASM 35333-44 | 25 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40-50 | ASME B18.21.1; MS-35333-46; NASM 35333-46 | 10 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40-50 | ASME B18.21.1; MS-35333-47; NASM 35333-47 | 10 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.410" | 0.052"-0.060" | Rockwell C40-50 | ASME B18.21.1; MS-35333-48; NASM 35333-48 | 10 | 000000000 | 00000 |
| 1" | 1.019" | 1.637" | 0.059"-0.067" | Rockwell C40-50 | ASME B18.21.1; MS-35333-49; NASM 35333-49 | 5 | 000000000 | 0000 |
| 1 1/4" | 1.260" | 1.950" | 0.059"-0.067" | Rockwell C40-50 | ASME B18.21.1; MS-35333-51; NASM 35333-51 | 5 | 000000000 | 0000 |
Bronze | ||||||||
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell B90 | ASME B18.21.1; MS-35333-103; NASM 35333-103 | 25 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell B90 | ASME B18.21.1; MS-35333-104; NASM 35333-104 | 25 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell B90 | ASME B18.21.1; MS-35333-105; NASM 35333-105 | 25 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell B90 | ASME B18.21.1; MS-35333-106; NASM 35333-106 | 25 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell B90 | ASME B18.21.1; MS-35333-107; NASM 35333-107 | 25 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell B90 | ASME B18.21.1; MS-35333-108; NASM 35333-108 | 25 | 000000000 | 00000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell B90 | ASME B18.21.1; MS-35333-109; NASM 35333-109 | 10 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell B90 | ASME B18.21.1; MS-35333-110; NASM 35333-110 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell B90 | ASME B18.21.1; MS-35333-113; NASM 35333-113 | 5 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell B90 | ASME B18.21.1; MS-35333-115; NASM 35333-115 | 1 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell B90 | ASME B18.21.1; MS-35333-116; NASM 35333-116 | 1 | 000000000 | 0000 |
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 | 0000 |
| 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 |
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 |