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Metric Tab Lock Washers
Bend the tab on these metric lock washers to prevent the fastener and washer from turning and loosening due to vibration. All meet DIN dimensional standards.
DIN 93 washers prevent loosening in high-vibration applications, such as mounting a motor. They create a mechanical lock on both the mounting surface and fastener when you bend the tab against the side of the mounting surface and the round part against the flats of a hex nut or bolt head.
DIN 432 washers have a partial cone shape that gives them spring-like flexibility, so they distribute force and grip tighter than split and tooth lock washers. However, they do not resist vibration as well as DIN 93 washers. These washers prevent loosening from wear or changes in temperature when you bend the tab against the flats of a hex nut or bolt head. They do not need to be used near the edge of the mounting surface.
Steel washers resist wear better than 316 stainless steel but aren’t as corrosion resistant.
18-8 stainless steel washers resist corrosion from chemicals and may be mildly magnetic.
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 | Pkg. Qty. | Pkg. | |
DIN 93—18-8 Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M4 | 4.3 | 14 | __ | 0.38 | 5 | Rockwell B70 | 100 | 000000000 | 000000 |
| M5 | 5.3 | 17 | __ | 0.5 | 6 | Rockwell B70 | 50 | 000000000 | 00000 |
| M6 | 6.4 | 19 | __ | 0.5 | 7 | Rockwell B70 | 50 | 000000000 | 00000 |
| M8 | 8.4 | 22 | __ | 0.75 | 8 | Rockwell B70 | 25 | 000000000 | 00000 |
| M10 | 10.5 | 26 | __ | 0.75 | 10 | Rockwell B70 | 25 | 000000000 | 00000 |
| M12 | 13 | 30 | __ | 1 | 12 | Rockwell B70 | 10 | 000000000 | 0000 |
DIN 432—Steel | |||||||||
| M4 | 4.3 | 14 | 2 | 0.4 | 2.5 | Rockwell B50 | 10 | 000000000 | 00000 |
| M5 | 5.3 | 17 | 2.5 | 0.75 | 3.5 | Rockwell B50 | 10 | 000000000 | 00000 |
| M6 | 6.4 | 19 | 3 | 0.75 | 3.5 | Rockwell B50 | 5 | 000000000 | 0000 |
| M8 | 8.4 | 22 | 4 | 1 | 3.5 | Rockwell B50 | 5 | 000000000 | 0000 |
| M10 | 10.5 | 26 | 4 | 1 | 4.5 | Rockwell B50 | 5 | 000000000 | 0000 |
| M12 | 13 | 30 | 4.5 | 1.2 | 4.5 | Rockwell B50 | 5 | 000000000 | 00000 |
| M14 | 15 | 33 | 4.5 | 1.2 | 4.5 | Rockwell B50 | 1 | 000000000 | 0000 |
| M16 | 17 | 36 | 4.5 | 1.2 | 5.5 | Rockwell B50 | 1 | 000000000 | 0000 |
| M20 | 21 | 42 | 4.5 | 1.6 | 6.5 | Rockwell B50 | 1 | 000000000 | 0000 |
| M24 | 25 | 50 | 6.5 | 1.6 | 7.5 | Rockwell B50 | 1 | 000000000 | 0000 |
| M30 | 31 | 63 | 9.5 | 1.6 | 8.5 | Rockwell B50 | 1 | 000000000 | 0000 |
DIN 432—316 Stainless Steel | |||||||||
| M4 | 4.3 | 14 | 2 | 0.4 | 2.5 | Not Rated | 50 | 000000000 | 00000 |
| M5 | 5.3 | 17 | 2.5 | 0.75 | 3.5 | Not Rated | 25 | 000000000 | 00000 |
| M6 | 6.4 | 19 | 3 | 0.75 | 3.5 | Not Rated | 25 | 000000000 | 00000 |
| M8 | 8.4 | 22 | 4 | 1 | 3.5 | Not Rated | 10 | 000000000 | 00000 |
| M10 | 10.5 | 26 | 4 | 1 | 4.5 | Not Rated | 10 | 000000000 | 00000 |
| M12 | 13 | 30 | 4.5 | 1.2 | 4.5 | Not Rated | 10 | 000000000 | 00000 |
| M14 | 15 | 33 | 4.5 | 1.2 | 4.5 | Not Rated | 5 | 000000000 | 00000 |
| M16 | 17 | 36 | 4.5 | 1.2 | 5.5 | Not Rated | 5 | 000000000 | 00000 |
| M20 | 21 | 42 | 4.5 | 1.6 | 6.5 | Not Rated | 1 | 000000000 | 0000 |
| M22 | 23 | 50 | 6.5 | 1.6 | 7.5 | Not Rated | 1 | 000000000 | 0000 |
| M24 | 25 | 50 | 6.5 | 1.6 | 7.5 | Not Rated | 1 | 000000000 | 0000 |
| M27 | 28 | 58 | 9.5 | 1.6 | 8.5 | Not Rated | 1 | 000000000 | 00000 |
| M30 | 31 | 63 | 9.5 | 1.6 | 8.5 | Not Rated | 1 | 000000000 | 0000 |
Tab Lock Washers
Bend one tab against the side of the mounting surface and the other tab against the flats on a bolt or nut to prevent both the fastener and washer from turning and loosening in high-vibration applications, such as a motor mount.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
Zinc-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 | Overall Lg. | Thick. | Each | |
18-8 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| No. 10 | 0.204" | 0.625" | 1 1/4" | 0.036" | 0000000 | 00000 |
| 1/4" | 0.281" | 0.75" | 1 3/8" | 0.036" | 0000000 | 0000 |
| 5/16" | 0.343" | 0.75" | 1 3/16" | 0.036" | 0000000 | 0000 |
| 3/8" | 0.406" | 0.875" | 1 9/16" | 0.062" | 0000000 | 0000 |
| 7/16" | 0.500" | 1.125" | 1 13/16" | 0.062" | 0000000 | 0000 |
| 1/2" | 0.531" | 1.125" | 1 9/16" | 0.062" | 0000000 | 0000 |
| 9/16" | 0.595" | 1.125" | 1 7/8" | 0.062" | 0000000 | 0000 |
| 5/8" | 0.656" | 1.25" | 2" | 0.062" | 0000000 | 00000 |
| 3/4" | 0.781" | 1.5" | 2 3/8" | 0.062" | 0000000 | 00000 |
| 7/8" | 0.910" | 1.75" | 2 5/8" | 0.062" | 0000000 | 00000 |
| 1" | 1.031" | 2" | 3" | 0.094" | 0000000 | 00000 |
| 1 1/4" | 1.281" | 2.5" | 3 1/4" | 0.125" | 0000000 | 00000 |
| 1 1/2" | 1.531" | 3" | 4" | 0.125" | 0000000 | 00000 |
Zinc-Plated Steel | ||||||
| No. 10 | 0.204" | 0.625" | 1 1/4" | 0.036" | 0000000 | 0000 |
| 1/4" | 0.281" | 0.75" | 1 3/8" | 0.036" | 0000000 | 0000 |
| 5/16" | 0.343" | 0.75" | 1 3/16" | 0.036" | 0000000 | 0000 |
| 3/8" | 0.406" | 0.875" | 1 9/16" | 0.063" | 0000000 | 0000 |
| 7/16" | 0.500" | 1.125" | 1 13/16" | 0.062" | 0000000 | 0000 |
| 1/2" | 0.531" | 1.125" | 1 9/16" | 0.063" | 0000000 | 0000 |
| 9/16" | 0.595" | 1.125" | 1 7/8" | 0.062" | 0000000 | 0000 |
| 5/8" | 0.656" | 1.25" | 2" | 0.062" | 0000000 | 0000 |
| 3/4" | 0.781" | 1.5" | 2 3/8" | 0.063" | 0000000 | 0000 |
| 7/8" | 0.910" | 1.75" | 2 5/8" | 0.062" | 0000000 | 0000 |
| 1" | 1.031" | 2" | 3" | 0.094" | 0000000 | 0000 |
| 1 1/4" | 1.281" | 2.5" | 3 1/4" | 0.125" | 0000000 | 0000 |
| 1 1/2" | 1.531" | 3" | 4" | 0.125" | 0000000 | 0000 |