din 251
*all measurements in millimeters (mm)*
| d | s | k max. | d1 max. |
| m5 | 4 | 5 | 11 |
| m6 | 5 | 6 | 13.5 |
| m8 | 6 | 8 | 17 |
| m10 | 8 | 10 | 19.5 |
| m12 | 10 | 12 | 22.5 |
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