din 529
*all measurements in millimeters (mm)*
| d | b | a approx. | c approx. |
| m8 | 20 | 24 | 12 |
| m10 | 25 | 30 | 15 |
| m12 | 30 | 36 | 18 |
| m16 | 40 | 48 | 24 |
| m20 | 50 | 60 | 30 |
| m24 | 60 | 75 | 36 |
| m30 | 75 | 95 | 45 |
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