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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 |