Head/Wrench Size (mm)
| Flange Bolt Diameter (mm) | DIN* 6921 (1983) | JIS* B1189 (Type 2 2005) |
| 5 | 8 | – |
| 6 | 10 | 10 |
| 8 | 13 | 12 |
| 10 | 15 | 14 |
| 12 | 16 | – |
| 14 | 18 | – |
| 16 | 21 | – |
| 20 | 27 | – |
*JIS – Japanese Industrial Standard
Metric Flange Bolt Head Wrench
*JIS – Japanese Industrial Standard