For Screw Size For Screw Size |
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ID ID |
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OD OD |
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Material Material |
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Finish Finish | Show |
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Finish Finish | Hide |
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Thickness Thickness |
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Washer Type Washer Type |
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| Flat | Split Lock |
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| Wedge Lock |
Hardness Hardness |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Serration Location Serration Location |
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Color Color |
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 | Black |
About Washers
More
Metric General Purpose Washers
Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.
Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. 18-8 and 17-7 PH stainless steel washers will hold up in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel. Black-oxide 18-8 stainless steel washers have a matte-black finish. More corrosion resistant than 18-8 and 17-7 PH stainless steel, 316 stainless steel washers will not corrode from salt water, chlorine solutions, and chemicals. Stronger and slightly more corrosion resistant than 316 stainless steel, Bumax 109 stainless steel washers are best for marine environments and chemical-processing plants.
Steel washers are stronger and more wear resistant than stainless steel washers. Steel washers without a plating or coating are best for dry environments, since moisture will cause them to rust. Zinc-plated steel washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Although they are stronger and more wear resistant than stainless steel, they are not as corrosion resistant. Use them in wet environments, but avoid contact with salt water and chemicals. Zinc-flake-coated and black corrosion-resistant-coated steel washers have the same level of corrosion resistance—both resist corrosion from chemicals and withstand 1,000 hours of salt spray. The black corrosion-resistant-coated steel washers have a black semi-gloss finish.
At one-third the weight of steel, aluminum washers are the lightest option. They will not rust in wet environments.
In addition to resisting rust in wet environments, copper and brass washers are electrically conductive.
Washers that meet ISO 7089, 7090, 7091, and 7092 (formerly DIN 125, 126, and 433), meet international standards for fastener dimensions. The ISO 7091 washers have a slightly rougher surface than a typical flat washer.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thickness, mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Class 8.8 Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M4 | 4.3 | 9.0 | 0.7-0.9 | Rockwell B91 | DIN 125; ISO 7089 | 50 | 000000000 | 00000 |
| M5 | 5.3 | 10.0 | 0.9-1.1 | Rockwell B91 | DIN 125; ISO 7089 | 50 | 000000000 | 0000 |
| M6 | 6.4 | 12.0 | 1.4-1.8 | Rockwell B91 | DIN 125; ISO 7089 | 50 | 000000000 | 0000 |
| M8 | 8.4 | 16.0 | 1.4-1.8 | Rockwell B91 | DIN 125; ISO 7089 | 50 | 000000000 | 00000 |
| M10 | 10.5 | 20.0 | 1.8-2.2 | Rockwell B91 | DIN 125; ISO 7089 | 25 | 000000000 | 00000 |
| M12 | 13.0 | 24.0 | 2.3-2.7 | Rockwell B91 | DIN 125; ISO 7089 | 10 | 000000000 | 0000 |
| M14 | 15.0 | 28.0 | 2.3-2.7 | Rockwell B91 | DIN 125; ISO 7089 | 10 | 000000000 | 00000 |
| M16 | 17.0 | 30.0 | 2.7-3.3 | Rockwell B91 | DIN 125; ISO 7089 | 10 | 000000000 | 00000 |
| M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B91 | DIN 125; ISO 7089 | 5 | 000000000 | 00000 |
| M20 | 21.0 | 37.0 | 2.7-3.3 | Rockwell B91 | DIN 125; ISO 7089 | 5 | 000000000 | 00000 |
| M24 | 25.0 | 44.0 | 3.7-4.3 | Rockwell B91 | DIN 125; ISO 7089 | 1 | 000000000 | 0000 |
| M30 | 31.0 | 56.0 | 3.7-4.3 | Rockwell B91 | DIN 125; ISO 7089 | 1 | 000000000 | 00000 |
SAE Washers
SAE washers generally have a smaller ID and OD than USS washers.
Black Corrosion-resistant coated and zinc-flake-coated steel washers resist chemicals and withstand 1,000 hours of salt spray.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Grade 8 Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.158" | 0.380" | 0.036"-0.065" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| No. 8 | 0.190" | 0.443" | 0.036"-0.065" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| No. 10 | 0.221" | 0.505" | 0.036"-0.065" | Rockwell C38 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1/4" | 0.281" | 0.625" | 0.055"-0.065" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.344" | 0.688" | 0.055"-0.065" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/8" | 0.406" | 0.812" | 0.055"-0.065" | Rockwell C38 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 7/16" | 0.469" | 0.922" | 0.055"-0.065" | Rockwell C38 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.531" | 1.062" | 0.097"-0.177" | Rockwell C38 | __ | 25 | 000000000 | 00000 |
| 9/16" | 0.599" | 1.168" | 0.074"-0.121" | Rockwell C38 | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 5/8" | 0.688" | 1.312" | 0.122"-0.177" | Rockwell C38 | __ | 25 | 000000000 | 00000 |
| 3/4" | 0.812" | 1.469" | 0.122"-0.177" | Rockwell C38 | __ | 20 | 000000000 | 00000 |
| 7/8" | 0.950" | 1.762" | 0.136"-0.177" | Rockwell C38 | __ | 1 | 000000000 | 0000 |
| 1" | 1.074" | 2.012" | 0.136"-0.177" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/8" | 1.262" | 2.243" | 0.146"-0.177" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.387" | 2.512" | 0.136"-0.177" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/2" | 1.637" | 3.012" | 0.136"-0.177" | Rockwell C38 | ASME B18.21.1 | 1 | 000000000 | 00000 |
Wedge Lock Washers
These two-piece washers provide more locking power than split, tooth, and spring lock washers. Wedges on the inside lock the two pieces together, and serrations on the exterior grip surfaces to resist loosening from high vibration and shifting. Washers are reusable.
Zinc-flake-coated steel washers are corrosion resistant in wet environments.
316 stainless steel and zinc-flake-coated steel washers are comparable to NORD-LOCK® Series washers.
Black zinc-flake-coated steel washers are comparable to Sherex TEC Series washers.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Steel | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 0.280" | 0.450" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 000000 |
| 1/4" | 0.280" | 0.530" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| 3/8" | 0.410" | 0.650" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| 3/8" | 0.410" | 0.830" | 0.090"-0.110" | Rockwell C46 | 10 | 000000000 | 00000 |
| 1/2" | 0.530" | 0.770" | 0.090"-0.110" | Rockwell C46 | 10 | 000000000 | 00000 |
| 1/2" | 0.530" | 1.000" | 0.120"-0.140" | Rockwell C46 | 8 | 000000000 | 00000 |
| 3/4" | 0.790" | 1.210" | 0.120"-0.140" | Rockwell C46 | 4 | 000000000 | 0000 |
| 3/4" | 0.790" | 1.540" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| 1" | 1.100" | 1.540" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| 1" | 1.100" | 1.910" | 0.170"-0.190" | Rockwell C46 | 1 | 000000000 | 0000 |
Black Zinc-Flake-Coated Steel | |||||||
| 1/4" | 0.280" | 0.450" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| 1/4" | 0.280" | 0.530" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| 3/8" | 0.410" | 0.650" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| 3/8" | 0.410" | 0.830" | 0.090"-0.110" | Rockwell C48 | 5 | 000000000 | 00000 |
| 1/2" | 0.530" | 0.770" | 0.090"-0.110" | Rockwell C48 | 5 | 000000000 | 0000 |
| 1/2" | 0.530" | 1.000" | 0.120"-0.140" | Rockwell C48 | 4 | 000000000 | 00000 |
| 3/4" | 0.790" | 1.210" | 0.120"-0.140" | Rockwell C48 | 4 | 000000000 | 00000 |
| 3/4" | 0.790" | 1.540" | 0.120"-0.140" | Rockwell C48 | 2 | 000000000 | 0000 |
| 1" | 1.100" | 1.540" | 0.120"-0.140" | Rockwell C48 | 2 | 000000000 | 0000 |
| For Screw Size | ID | OD | Thick. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Steel | |||||||
|---|---|---|---|---|---|---|---|
| M6 | 0.260" | 0.430" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 000000 |
| M6 | 0.260" | 0.530" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| M10 | 0.420" | 0.650" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| M10 | 0.420" | 0.830" | 0.090"-0.110" | Rockwell C46 | 10 | 000000000 | 00000 |
| M12 | 0.510" | 0.770" | 0.090"-0.110" | Rockwell C46 | 10 | 000000000 | 00000 |
| M12 | 0.510" | 1.000" | 0.120"-0.140" | Rockwell C46 | 8 | 000000000 | 00000 |
| M18 | 0.770" | 1.140" | 0.120"-0.140" | Rockwell C46 | 4 | 000000000 | 0000 |
| M18 | 0.770" | 1.360" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| M20 | 0.840" | 1.210" | 0.120"-0.140" | Rockwell C46 | 4 | 000000000 | 0000 |
| M20 | 0.840" | 1.540" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| M24 | 1.000" | 1.540" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| M24 | 1.000" | 1.910" | 0.170"-0.190" | Rockwell C46 | 2 | 000000000 | 00000 |
| M27 | 1.120" | 1.650" | 0.220"-0.240" | Rockwell C46 | 1 | 000000000 | 0000 |
| M27 | 1.120" | 1.910" | 0.220"-0.240" | Rockwell C46 | 1 | 000000000 | 0000 |
| M42 | 1.700" | 2.480" | 0.250"-0.270" | Rockwell C46 | 1 | 000000000 | 00000 |
Black Zinc-Flake-Coated Steel | |||||||
| M6 | 0.260" | 0.430" | 0.060"-0.080" | Rockwell C48 | 10 | 000000000 | 00000 |
| M6 | 0.260" | 0.530" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| M8 | 0.340" | 0.650" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| M10 | 0.420" | 0.650" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| M10 | 0.420" | 0.830" | 0.090"-0.110" | Rockwell C48 | 5 | 000000000 | 00000 |
| M12 | 0.510" | 0.770" | 0.090"-0.110" | Rockwell C48 | 5 | 000000000 | 0000 |
| M12 | 0.510" | 1.000" | 0.120"-0.140" | Rockwell C48 | 4 | 000000000 | 00000 |
| M16 | 0.670" | 1.210" | 0.120"-0.140" | Rockwell C48 | 4 | 000000000 | 00000 |
| For Screw Size | ID | OD | Thick. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Steel | |||||||
|---|---|---|---|---|---|---|---|
| No. 5, M3 | 0.130" | 0.280" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 000000 |
| No. 6, M3.5 | 0.150" | 0.300" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| No. 6, M3.5 | 0.150" | 0.350" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| No. 8, M4 | 0.170" | 0.300" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| No. 8, M4 | 0.170" | 0.350" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| No. 10, M5 | 0.210" | 0.350" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| No. 10, M5 | 0.210" | 0.430" | 0.060"-0.080" | Rockwell C46 | 20 | 000000000 | 00000 |
| 5/16", M8 | 0.340" | 0.530" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| 5/16", M8 | 0.340" | 0.650" | 0.090"-0.110" | Rockwell C46 | 20 | 000000000 | 00000 |
| 7/16", M11 | 0.450" | 0.730" | 0.090"-0.110" | Rockwell C46 | 10 | 000000000 | 00000 |
| 9/16", M14 | 0.600" | 0.910" | 0.120"-0.140" | Rockwell C46 | 10 | 000000000 | 00000 |
| 9/16", M14 | 0.600" | 1.210" | 0.120"-0.140" | Rockwell C46 | 4 | 000000000 | 0000 |
| 5/8", M16 | 0.670" | 1.000" | 0.120"-0.140" | Rockwell C46 | 8 | 000000000 | 00000 |
| 5/8", M16 | 0.670" | 1.210" | 0.120"-0.140" | Rockwell C46 | 4 | 000000000 | 0000 |
| 7/8", M22 | 0.920" | 1.360" | 0.120"-0.140" | Rockwell C46 | 2 | 000000000 | 0000 |
| 7/8", M22 | 0.920" | 1.650" | 0.170"-0.190" | Rockwell C46 | 2 | 000000000 | 00000 |
| 1 1/8", M30 | 1.240" | 1.850" | 0.220"-0.240" | Rockwell C46 | 1 | 000000000 | 0000 |
| 1 1/8", M30 | 1.240" | 2.300" | 0.250"-0.270" | Rockwell C46 | 1 | 000000000 | 0000 |
| 1 1/4", M33 | 1.350" | 1.910" | 0.220"-0.240" | Rockwell C46 | 1 | 000000000 | 0000 |
| 1 3/8", M36 | 1.470" | 2.170" | 0.250"-0.270" | Rockwell C46 | 1 | 000000000 | 0000 |
| 1 1/2", M39 | 1.590" | 2.300" | 0.250"-0.270" | Rockwell C46 | 1 | 000000000 | 0000 |
| 1 3/4", M45 | 1.820" | 2.760" | 0.270"-0.290" | Rockwell C46 | 1 | 000000000 | 00000 |
| 1 7/8", M45 | 1.950" | 2.950" | 0.270"-0.290" | Rockwell C46 | 1 | 000000000 | 00000 |
| 2", M52 | 2.110" | 3.150" | 0.270"-0.290" | Rockwell C46 | 1 | 000000000 | 00000 |
| 2 1/4", M56 | 2.330" | 3.350" | 0.270"-0.290" | Rockwell C46 | 1 | 000000000 | 00000 |
| 2 1/2", M64 | 2.640" | 3.740" | 0.270"-0.290" | Rockwell C46 | 1 | 000000000 | 00000 |
Black Zinc-Flake-Coated Steel | |||||||
| 5/16", M8 | 0.340" | 0.530" | 0.090"-0.110" | Rockwell C48 | 10 | 000000000 | 00000 |
| 5/8", M16 | 0.670" | 1.000" | 0.120"-0.140" | Rockwell C48 | 4 | 000000000 | 00000 |
Split Lock Washers
As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.
Zinc-flake-coated steel washers are 40 times as corrosion resistant as zinc-plated washers and comparable to Magni-coated washers.
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. | |
Zinc Flake Coated | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4" | 0.260" | 0.487" | 0.062" | Rockwell C38 | ASME B18.21.1 | 25 | 00000000 | 00000 |
| 5/16" | 0.322" | 0.583" | 0.078" | Rockwell C38 | ASME B18.21.1 | 25 | 00000000 | 0000 |
| 3/8" | 0.385" | 0.680" | 0.094" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 7/16" | 0.450" | 0.776" | 0.109" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 1/2" | 0.512" | 0.869" | 0.125" | Rockwell C38 | ASME B18.21.1 | 10 | 00000000 | 0000 |
| 9/16" | 0.574" | 0.965" | 0.141" | Rockwell C38 | ASME B18.21.1 | 5 | 00000000 | 0000 |
| 5/8" | 0.641" | 1.073" | 0.156" | Rockwell C38 | ASME B18.21.1 | 5 | 00000000 | 0000 |
| 3/4" | 0.766" | 1.265" | 0.188" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 7/8" | 0.894" | 1.459" | 0.219" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 1" | 1.024" | 1.656" | 0.250" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 0000 |
| 1 1/4" | 1.280" | 2.036" | 0.312" | Rockwell C38 | ASME B18.21.1 | 1 | 00000000 | 00000 |