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Washer Type Washer Type |
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| Spring Lock | Tab Lock |
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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Hardness Hardness |
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About Washers
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Belleville Spring Lock Washers for Socket Head Screws
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.
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 5, M3 | 0.126" | 0.217" | 0.020" | 0.035" | Rockwell C38 | 50 | 000000000 | 000000 |
| No. 6, M3.5 | 0.146" | 0.236" | 0.028" | 0.035" | Rockwell C38 | 50 | 000000000 | 0000 |
| No. 8, M4 | 0.169" | 0.276" | 0.028" | 0.039" | Rockwell C38 | 50 | 000000000 | 00000 |
| No. 10, M5 | 0.209" | 0.354" | 0.028" | 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" | 0.039" | 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" | 0.051" | 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" | 0.059" | 0.079" | Rockwell C38 | 1 | 000000000 | 0000 |
| 5/8", M16 | 0.669" | 0.945" | 0.059" | 0.083" | Rockwell C38 | 1 | 000000000 | 0000 |
| 3/4", M19 | 0.787" | 1.181" | 0.071" | 0.098" | Rockwell C38 | 1 | 000000000 | 0000 |
| 7/8", M22 | 0.906" | 1.299" | 0.071" | 0.106" | Rockwell C38 | 1 | 000000000 | 0000 |
| 1", M25 | 1.063" | 1.496" | 0.098" | 0.122" | Rockwell C38 | 1 | 000000000 | 00000 |
| 1 1/8", M30 | 1.244" | 1.772" | 0.098" | 0.142" | Rockwell C38 | 1 | 000000000 | 00000 |
| 1 3/8", M36 | 1.496" | 2.126" | 0.118" | 0.165" | Rockwell C38 | 1 | 000000000 | 00000 |
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.067" | 0.126" | 0.020" | 0.030" | Rockwell C38 | 50 | 000000000 | 000000 |
| M2 | 0.087" | 0.157" | 0.020" | 0.024" | Rockwell C38 | 50 | 000000000 | 00000 |
| M2.5 | 0.106" | 0.189" | 0.020" | 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" | 0.071" | 0.091" | Rockwell C38 | 1 | 000000000 | 0000 |
| M20 | 0.827" | 1.181" | 0.071" | 0.098" | Rockwell C38 | 1 | 000000000 | 0000 |
Belleville Spring Lock Washers
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.
18-8 stainless steel and 17-7 PH stainless steel washers have good chemical resistance and may be mildly magnetic. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel washers.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
17-7 PH Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.143" | 0.341" | 0.023"-0.027" | 0.042" | Rockwell C38 | 50 | 000000000 | 000000 |
| No. 8 | 0.169" | 0.403" | 0.029"-0.033" | 0.050" | Rockwell C38 | 50 | 000000000 | 00000 |
| No. 10 | 0.197" | 0.465" | 0.033"-0.037" | 0.057" | Rockwell C38 | 25 | 000000000 | 00000 |
| 1/4" | 0.252" | 0.551" | 0.048"-0.052" | 0.067" | Rockwell C38 | 25 | 000000000 | 0000 |
| 5/16" | 0.331" | 0.709" | 0.074"-0.082" | 0.102" | Rockwell C38 | 10 | 000000000 | 0000 |
| 3/8" | 0.413" | 0.906" | 0.074"-0.082" | 0.106" | Rockwell C38 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 1.142" | 0.093"-0.103" | 0.130" | Rockwell C38 | 5 | 000000000 | 0000 |
| 5/8" | 0.669" | 1.535" | 0.131"-0.145" | 0.185" | Rockwell C38 | 1 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| 1/4" | 0.260" | 0.683" | 0.048"-0.052" | 0.090" | Rockwell C38 | 10 | 000000000 | 0000 |
| 5/16" | 0.324" | 0.807" | 0.060"-0.064" | 0.100" | Rockwell C38 | 10 | 000000000 | 0000 |
| 3/8" | 0.389" | 0.930" | 0.070"-0.076" | 0.112" | Rockwell C38 | 10 | 000000000 | 00000 |
| 1/2" | 0.519" | 1.179" | 0.091"-0.099" | 0.152" | Rockwell C38 | 5 | 000000000 | 00000 |
| 3/4" | 0.773" | 1.750" | 0.185"-0.205" | 0.195" | Rockwell C38 | 1 | 000000000 | 0000 |
| 5/8" | 0.644" | 1.500" | 0.168"-0.186" | 0.177" | Rockwell C38 | 1 | 000000000 | 0000 |
Metric Spring Lock Washers
The arched shape of these washers presses up against a bolt and down against a nut to prevent loosening from wear, vibration, or temperature changes. Similar to a spring, they flatten out as pressure is applied, helping to absorb shocks. They grip bolts more tightly than split and tooth lock washers. Unlike split lock washers, which can only be tightened in one direction, these washers have a continuous body that can rotate in either direction.
Conical and curved washers are functionally the same, and are often referenced using their DIN specifications. These DIN specifications refer to slight differences in OD and thickness. DIN 6796 is the standard for conical spring lock washers, which are also known as Belleville washers.
Stainless steel washers are more corrosion resistant than steel, and almost as strong. 18-8 stainless steel washers will hold up in wet and humid environments, but will corrode if exposed to salt water or chemicals. 316 stainless steel washers are the most corrosion resistant, and will not corrode from water, salt, or chemicals.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Overall Ht., mm | Hardness | Pkg. Qty. | Pkg. | |
Conical—DIN 6796 | ||||||||
|---|---|---|---|---|---|---|---|---|
18-8 Stainless Steel | ||||||||
| M2 | 2.2 | 5.0 | 0.4 | 0.60 | Rockwell C42 | 50 | 000000000 | 00000 |
| M3 | 3.2 | 7.0 | 0.6 | 0.90 | Not Rated | 100 | 000000000 | 0000 |
| M4 | 4.3 | 9.0 | 1.0 | 1.30 | Not Rated | 25 | 000000000 | 0000 |
| M5 | 5.3 | 11.0 | 1.2 | 1.60 | Rockwell C42 | 25 | 000000000 | 0000 |
| M6 | 6.4 | 14.0 | 1.5 | 2.00 | Not Rated | 25 | 000000000 | 0000 |
| M8 | 8.4 | 18.0 | 2.0 | 2.60 | Not Rated | 10 | 000000000 | 0000 |
| M10 | 10.5 | 23.0 | 2.5 | 3.20 | Not Rated | 10 | 000000000 | 0000 |
| M12 | 13.0 | 29.0 | 3.0 | 4.00 | Not Rated | 10 | 000000000 | 0000 |
| M14 | 15.0 | 35.0 | 3.5 | 4.70 | Rockwell C42 | 1 | 000000000 | 0000 |
| M16 | 17.0 | 39.0 | 4.0 | 5.30 | Rockwell C42 | 1 | 000000000 | 0000 |
| M18 | 19.0 | 42.0 | 4.5 | 5.80 | Not Rated | 1 | 000000000 | 00000 |
| M20 | 21.0 | 45.0 | 5.0 | 6.40 | Not Rated | 1 | 000000000 | 00000 |
| M22 | 23.0 | 49.0 | 5.5 | 7.05 | Not Rated | 1 | 000000000 | 00000 |
| M24 | 25.0 | 56.0 | 6.0 | 7.75 | Not Rated | 1 | 000000000 | 00000 |
316 Stainless Steel | ||||||||
| M2 | 2.2 | 5.0 | 0.4 | 0.60 | Rockwell C42 | 25 | 000000000 | 0000 |
| M3 | 3.2 | 7.0 | 0.6 | 0.90 | Rockwell C42 | 25 | 000000000 | 0000 |
| M4 | 4.3 | 9.0 | 1.0 | 1.30 | Rockwell C42 | 10 | 000000000 | 0000 |
| M5 | 5.3 | 11.0 | 1.2 | 1.60 | Rockwell C42 | 10 | 000000000 | 0000 |
| M6 | 6.4 | 14.0 | 1.5 | 2.00 | Rockwell C42 | 10 | 000000000 | 0000 |
| M8 | 8.4 | 18.0 | 2.0 | 2.60 | Rockwell C42 | 5 | 000000000 | 00000 |
| M10 | 10.5 | 23.0 | 2.5 | 3.20 | Rockwell C42 | 1 | 000000000 | 0000 |
| M12 | 13.0 | 29.0 | 3.0 | 4.00 | Rockwell C42 | 1 | 000000000 | 0000 |
| M14 | 15.0 | 35.0 | 3.5 | 4.70 | Rockwell C42 | 1 | 000000000 | 0000 |
| M16 | 17.0 | 39.0 | 4.0 | 5.30 | Rockwell C42 | 1 | 000000000 | 00000 |
| M18 | 19.0 | 42.0 | 4.5 | 5.80 | Not Rated | 1 | 000000000 | 00000 |
| M20 | 21.0 | 45.0 | 5.0 | 6.40 | Not Rated | 1 | 000000000 | 00000 |
| M22 | 23.0 | 49.0 | 5.5 | 7.05 | Not Rated | 1 | 000000000 | 00000 |
| M24 | 25.0 | 56.0 | 6.0 | 7.75 | Not Rated | 1 | 000000000 | 00000 |
Metric Tab Lock Washers
Bend the tab of these metric lock washers against the flats of a hex nut or bolt head to prevent the fastener and washer from turning and loosening due to vibration, wear, or changes in temperature. Their partial cone shape gives these washers spring-like flexibility, so they distribute force and grip tighter than split and tooth lock washers. All meet DIN 432, an international standard for tab washer dimensions.
316 stainless steel washers are more corrosion resistant than steel, and nearly as strong. You can expose them to salt water, chlorine solutions, and chemicals without any rusting.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Overall Ht., mm | Thick., mm | Tab Wd., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| M4 | 4.3 | 14 | 2 | 0.4 | 2.5 | Not Rated | DIN 432 | 50 | 000000000 | 000000 |
| M5 | 5.3 | 17 | 2.5 | 0.75 | 3.5 | Not Rated | DIN 432 | 25 | 000000000 | 00000 |
| M6 | 6.4 | 19 | 3 | 0.75 | 3.5 | Not Rated | DIN 432 | 25 | 000000000 | 00000 |
| M8 | 8.4 | 22 | 4 | 1 | 3.5 | Not Rated | DIN 432 | 10 | 000000000 | 00000 |
| M10 | 10.5 | 26 | 4 | 1 | 4.5 | Not Rated | DIN 432 | 10 | 000000000 | 00000 |
| M12 | 13 | 30 | 4.5 | 1.2 | 4.5 | Not Rated | DIN 432 | 10 | 000000000 | 00000 |
| M14 | 15 | 33 | 4.5 | 1.2 | 4.5 | Not Rated | DIN 432 | 5 | 000000000 | 00000 |
| M16 | 17 | 36 | 4.5 | 1.2 | 5.5 | Not Rated | DIN 432 | 5 | 000000000 | 00000 |
| M18 | 19 | 40 | 4.5 | 1.2 | 6.5 | Not Rated | DIN 432 | 1 | 000000000 | 0000 |
| M20 | 21 | 42 | 4.5 | 1.6 | 6.5 | Not Rated | DIN 432 | 1 | 000000000 | 0000 |
| M22 | 23 | 50 | 6.5 | 1.6 | 7.5 | Not Rated | DIN 432 | 1 | 000000000 | 0000 |
| M24 | 25 | 50 | 6.5 | 1.6 | 7.5 | Not Rated | DIN 432 | 1 | 000000000 | 0000 |
| M27 | 28 | 58 | 9.5 | 1.6 | 8.5 | Not Rated | DIN 432 | 1 | 000000000 | 00000 |
| M30 | 31 | 63 | 9.5 | 1.6 | 8.5 | Not Rated | DIN 432 | 1 | 000000000 | 0000 |
| M33 | 34 | 68 | 9.5 | 1.6 | 9.5 | Not Rated | DIN 432 | 1 | 000000000 | 00000 |
| M36 | 37 | 75 | 9.5 | 2 | 11 | Not Rated | DIN 432 | 1 | 000000000 | 00000 |