The wrench size for metric set screws (grub screws) can be found as dimension (s) in technical drawings and is given in mm (millimetres).
Wrench Sizes |
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Tread Sizes |
Drive Hexagon Socket |
Drive Innernal Serration (TX) |
M2,5 | 1,3 mm | |
M3 | 1,5 mm | T6 |
M4 | 2,0 mm | T8 |
M5 | 2,5 mm | T10 |
M6 | 3 mm | T15 |
M8 | 4 mm | T25 |
M10 | 5 mm | T30 |
M12 | 6 mm | T40 |
M14 | 8 mm | T50 |
M20 | 10 mm | T55 |
M24 | 12 mm | T60 |
* All information without guarantee.