For Screw Size For Screw Size |
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Material Material |
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OD OD |
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ID ID |
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Thickness Thickness |
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Overall Height Overall Height |
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Serration Location Serration Location |
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Hardness Hardness |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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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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About Washers
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Belleville Spring Lock Washers for Socket Head Screws
Steel
Zinc-Plated Steel
Stainless Steel
These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers. They minimize loosening from wear, temperature changes, and vibration. Serrations on the top and bottom provide extra gripping power. Load-rated Belleville disc springs are also available.
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.
Inch and Metric
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 5, M3 | 0.126" | 0.217" | 0.018" | 0.035" | Rockwell C40 | 100 | 000000000 | 00000 |
| No. 6, M3.5 | 0.146" | 0.236" | 0.018" | 0.035" | Rockwell C40 | 100 | 000000000 | 0000 |
| No. 8, M4 | 0.169" | 0.276" | 0.020" | 0.039" | Rockwell C40 | 100 | 000000000 | 0000 |
| No. 10, M5 | 0.209" | 0.354" | 0.024" | 0.043" | Rockwell C40 | 100 | 000000000 | 0000 |
| 1/4", M6 | 0.264" | 0.374" | 0.028" | 0.047" | Rockwell C40 | 100 | 000000000 | 00000 |
| 5/16", M8 | 0.331" | 0.512" | 0.031" | 0.055" | Rockwell C40 | 100 | 000000000 | 00000 |
| 3/8", M10 | 0.413" | 0.630" | 0.039" | 0.063" | Rockwell C40 | 100 | 000000000 | 00000 |
| 7/16", M11 | 0.457" | 0.626" | 0.039" | 0.063" | Rockwell C40 | 100 | 000000000 | 00000 |
| 1/2", M12 | 0.539" | 0.748" | 0.043" | 0.071" | Rockwell C40 | 50 | 000000000 | 00000 |
| 9/16", M14 | 0.591" | 0.866" | 0.047" | 0.079" | Rockwell C40 | 50 | 000000000 | 00000 |
| 5/8", M16 | 0.669" | 0.945" | 0.051" | 0.083" | Rockwell C40 | 50 | 000000000 | 00000 |
| 3/4", M19 | 0.787" | 1.181" | 0.059" | 0.098" | Rockwell C40 | 25 | 000000000 | 00000 |
| 7/8", M22 | 0.906" | 1.299" | 0.059" | 0.106" | Rockwell C40 | 20 | 000000000 | 00000 |
| 1", M25 | 1.063" | 1.496" | 0.079" | 0.122" | Rockwell C40 | 10 | 000000000 | 00000 |
| 1 1/8", M30 | 1.244" | 1.772" | 0.079" | 0.142" | Rockwell C40 | 5 | 000000000 | 00000 |
| 1 3/8", M36 | 1.496" | 2.126" | 0.098" | 0.165" | Rockwell C40 | 5 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| No. 5, M3 | 0.126" | 0.217" | 0.018" | 0.035" | Rockwell C38 | 100 | 000000000 | 0000 |
| No. 6, M3.5 | 0.146" | 0.236" | 0.020" | 0.035" | Rockwell C38 | 100 | 000000000 | 00000 |
| No. 8, M4 | 0.169" | 0.276" | 0.020" | 0.039" | Rockwell C38 | 100 | 000000000 | 00000 |
| No. 10, M5 | 0.209" | 0.354" | 0.024" | 0.043" | Rockwell C38 | 100 | 000000000 | 00000 |
| 1/4", M6 | 0.264" | 0.374" | 0.024" | 0.047" | Rockwell C38 | 50 | 000000000 | 00000 |
| 5/16", M8 | 0.331" | 0.512" | 0.028" | 0.055" | Rockwell C38 | 50 | 000000000 | 00000 |
| 3/8", M10 | 0.413" | 0.630" | 0.035" | 0.063" | Rockwell C38 | 25 | 000000000 | 0000 |
| 7/16", M11 | 0.457" | 0.626" | 0.035" | 0.063" | Rockwell C38 | 25 | 000000000 | 0000 |
| 1/2", M12 | 0.539" | 0.748" | 0.039" | 0.071" | Rockwell C38 | 25 | 000000000 | 0000 |
| 9/16", M14 | 0.591" | 0.866" | 0.043" | 0.079" | Rockwell C38 | 25 | 000000000 | 00000 |
| 5/8", M16 | 0.669" | 0.945" | 0.047" | 0.083" | Rockwell C38 | 25 | 000000000 | 00000 |
| 3/4", M19 | 0.787" | 1.181" | 0.055" | 0.098" | Rockwell C38 | 10 | 000000000 | 00000 |
| 7/8", M22 | 0.906" | 1.299" | 0.055" | 0.106" | Rockwell C38 | 5 | 000000000 | 00000 |
| 1", M25 | 1.063" | 1.496" | 0.071" | 0.122" | Rockwell C38 | 5 | 000000000 | 00000 |
| 1 1/16", M27 | 1.126" | 1.535" | 0.071" | 0.122" | Rockwell C38 | 5 | 000000000 | 00000 |
| 1 1/8", M30 | 1.244" | 1.772" | 0.071" | 0.142" | Rockwell C38 | 5 | 000000000 | 00000 |
| 1 3/8", M36 | 1.496" | 2.126" | 0.098" | 0.165" | Rockwell C38 | 1 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| No. 5, M3 | 0.126" | 0.217" | 0.018" | 0.035" | Rockwell C38 | 50 | 000000000 | 00000 |
| No. 6, M3.5 | 0.146" | 0.236" | 0.018" | 0.035" | Rockwell C38 | 50 | 000000000 | 00000 |
| No. 8, M4 | 0.169" | 0.276" | 0.020" | 0.039" | Rockwell C38 | 50 | 000000000 | 00000 |
| No. 10, M5 | 0.209" | 0.354" | 0.024" | 0.043" | Rockwell C38 | 25 | 000000000 | 00000 |
| 1/4", M6 | 0.264" | 0.374" | 0.028" | 0.047" | Rockwell C38 | 10 | 000000000 | 0000 |
| 5/16", M8 | 0.331" | 0.512" | 0.031" | 0.055" | Rockwell C38 | 10 | 000000000 | 0000 |
| 3/8", M10 | 0.413" | 0.630" | 0.039" | 0.063" | Rockwell C38 | 5 | 000000000 | 0000 |
| 7/16", M11 | 0.457" | 0.626" | 0.039" | 0.063" | Rockwell C38 | 5 | 000000000 | 0000 |
| 1/2", M12 | 0.539" | 0.748" | 0.043" | 0.071" | Rockwell C38 | 5 | 000000000 | 00000 |
| 9/16", M14 | 0.591" | 0.866" | 0.047" | 0.079" | Rockwell C38 | 1 | 000000000 | 0000 |
| 5/8", M16 | 0.669" | 0.945" | 0.051" | 0.083" | Rockwell C38 | 1 | 000000000 | 0000 |
| 3/4", M19 | 0.787" | 1.181" | 0.059" | 0.098" | Rockwell C38 | 1 | 000000000 | 0000 |
| 7/8", M22 | 0.906" | 1.299" | 0.059" | 0.106" | Rockwell C38 | 1 | 000000000 | 0000 |
| 1", M25 | 1.063" | 1.496" | 0.079" | 0.122" | Rockwell C38 | 1 | 000000000 | 00000 |
| 1 1/8", M30 | 1.244" | 1.772" | 0.079" | 0.142" | Rockwell C38 | 1 | 000000000 | 00000 |
| 1 3/8", M36 | 1.496" | 2.126" | 0.098" | 0.165" | Rockwell C38 | 1 | 000000000 | 00000 |
Metric
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.067" | 0.126" | 0.014" | 0.024" | Rockwell C40 | 100 | 000000000 | 00000 |
| M2 | 0.087" | 0.157" | 0.014" | 0.024" | Rockwell C40 | 100 | 000000000 | 0000 |
| M2.5 | 0.106" | 0.189" | 0.018" | 0.035" | Rockwell C40 | 100 | 000000000 | 0000 |
| M6 | 0.252" | 0.394" | 0.024" | 0.047" | Rockwell C40 | 100 | 000000000 | 00000 |
| M12 | 0.512" | 0.709" | 0.039" | 0.067" | Rockwell C40 | 50 | 000000000 | 00000 |
| M18 | 0.748" | 1.063" | 0.059" | 0.091" | Rockwell C40 | 10 | 000000000 | 0000 |
| M20 | 0.827" | 1.181" | 0.059" | 0.098" | Rockwell C40 | 10 | 000000000 | 00000 |
| M24 | 1.008" | 1.417" | 0.063" | 0.114" | Rockwell C40 | 5 | 000000000 | 00000 |
| M27 | 1.126" | 1.535" | 0.071" | 0.122" | Rockwell C40 | 5 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| M1.6 | 0.067" | 0.126" | 0.014" | 0.024" | Rockwell C38 | 100 | 000000000 | 0000 |
| M2 | 0.087" | 0.157" | 0.014" | 0.024" | Rockwell C38 | 100 | 000000000 | 0000 |
| M2.5 | 0.106" | 0.189" | 0.018" | 0.035" | Rockwell C38 | 100 | 000000000 | 0000 |
| M18 | 0.748" | 1.063" | 0.055" | 0.091" | Rockwell C38 | 10 | 000000000 | 00000 |
| M20 | 0.827" | 1.181" | 0.055" | 0.098" | Rockwell C38 | 5 | 000000000 | 00000 |
| M24 | 1.008" | 1.417" | 0.063" | 0.114" | Rockwell C38 | 5 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
| M1.6 | 0.067" | 0.126" | 0.020" | 0.030" | Rockwell C38 | 50 | 000000000 | 00000 |
| M2 | 0.087" | 0.157" | 0.014" | 0.024" | Rockwell C38 | 50 | 000000000 | 00000 |
| M2.5 | 0.106" | 0.189" | 0.018" | 0.035" | Rockwell C38 | 50 | 000000000 | 00000 |
| M7 | 0.291" | 0.472" | 0.028" | 0.051" | Rockwell C38 | 5 | 000000000 | 00000 |
| M18 | 0.748" | 1.063" | 0.059" | 0.091" | Rockwell C38 | 1 | 000000000 | 0000 |
| M20 | 0.827" | 1.181" | 0.059" | 0.098" | Rockwell C38 | 1 | 000000000 | 0000 |
Belleville Spring Lock Washers
Zinc-Plated Steel (Serrated Top)
Steel (Serrated Top)
Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers. They minimize loosening from wear, temperature changes, and vibration. Load-rated Belleville disc springs are also available.
Zinc-plated steel washers have an outer layer of zinc that protects the inner steel from rust in wet environments and extends the life of the washer.
For extra gripping power, use washers with a serrated top.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel with Serrated Top | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.142" | 0.362" | 0.025"-0.031" | 0.047" | Rockwell C40 | 50 | 000000000 | 00000 |
| No. 8 | 0.161" | 0.402" | 0.036"-0.042" | 0.059" | Rockwell C40 | 10 | 000000000 | 0000 |
| No. 10 | 0.201" | 0.481" | 0.047"-0.053" | 0.073" | Rockwell C40 | 10 | 000000000 | 0000 |
| 1/4" | 0.254" | 0.559" | 0.049"-0.055" | 0.087" | Rockwell C40 | 50 | 000000000 | 0000 |
| 5/16" | 0.323" | 0.717" | 0.052"-0.058" | 0.095" | Rockwell C40 | 25 | 000000000 | 0000 |
| 3/8" | 0.402" | 0.877" | 0.059"-0.065" | 0.108" | Rockwell C40 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 1.074" | 0.075"-0.082" | 0.120" | Rockwell C40 | 10 | 000000000 | 0000 |
| 5/8" | 0.646" | 1.273" | 0.095"-0.101" | 0.156" | Rockwell C40 | 5 | 000000000 | 0000 |
Steel with Serrated Top | ||||||||
| No. 6 | 0.142" | 0.362" | 0.025"-0.031" | 0.047" | Rockwell C40 | 100 | 000000000 | 00000 |
| No. 8 | 0.161" | 0.402" | 0.036"-0.042" | 0.059" | Rockwell C40 | 100 | 000000000 | 00000 |
| No. 10 | 0.201" | 0.481" | 0.047"-0.053" | 0.073" | Rockwell C40 | 50 | 000000000 | 0000 |
| 1/4" | 0.254" | 0.559" | 0.049"-0.055" | 0.087" | Rockwell C40 | 50 | 000000000 | 0000 |
| 5/16" | 0.323" | 0.717" | 0.052"-0.058" | 0.095" | Rockwell C40 | 50 | 000000000 | 00000 |
| 3/8" | 0.402" | 0.877" | 0.059"-0.065" | 0.108" | Rockwell C40 | 25 | 000000000 | 00000 |
| 7/16" | 0.489" | 1.074" | 0.075"-0.081" | 0.120" | Rockwell C40 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 1.074" | 0.075"-0.081" | 0.120" | Rockwell C40 | 10 | 000000000 | 0000 |
| 5/8" | 0.646" | 1.273" | 0.095"-0.101" | 0.156" | Rockwell C40 | 5 | 000000000 | 0000 |