din 7
*all measurements in millimeters (mm)*
| d | r | c |
| m2 | 2 | 0.3 |
| m3 | 3 | 0.45 |
| m4 | 4 | 0.6 |
| m5 | 5 | 0.75 |
| m6 | 6 | 0.9 |
| m8 | 8 | 1.2 |
| m10 | 10 | 1.5 |
| m12 | 12 | 1.8 |
| m16 | 16 | 2.5 |
| m20 | 20 | 3 |
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