din 7978
*all measurements in millimeters (mm)*
| d | a approx | r approx | d1 | d2 | t1 | t2 max | t3 |
| 6 | 0.8 | 6 | m4 | 4.3 | 6 | 10 | 1 |
| 8 | 1 | 8 | m5 | 5.3 | 8 | 12 | 1.2 |
| 10 | 1.2 | 10 | m6 | 6.4 | 10 | 16 | 1.2 |
| 12 | 1.6 | 12 | m8 | 8.4 | 12 | 20 | 1.2 |
| 16 | 2 | 16 | m10 | 10.5 | 16 | 25 | 1.5 |
| 20 | 2.5 | 20 | m12 | 13 | 18 | 27 | 1.5 |
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