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Master Charts
Comprehensive reference tables for metric and imperial fastener specifications.
Metric Bolt Specifications
All dimensions in mm| Size | Pitch | Hex Head | Phillips | Pilot Hole | Clearance | Torque (Nm) |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 6.0 | 2.5 | 3.2 | 1.1 |
| M4 | 0.7 | 7.0 | 8.0 | 3.3 | 4.3 | 2.5 |
| M5 | 0.8 | 8.0 | 10.0 | 4.2 | 5.3 | 5.0 |
| M6 | 1.0 | 10.0 | 12.0 | 5.0 | 6.4 | 8.5 |
| M8 | 1.25 | 13.0 | 16.0 | 6.8 | 8.4 | 21 |
| M10 | 1.5 | 16.0 | 20.0 | 8.5 | 10.5 | 40 |
| M12 | 1.75 | 18.0 | 24.0 | 10.2 | 13.0 | 70 |
| M14 | 2.0 | 21.0 | - | 12.0 | 15.0 | 110 |
| M16 | 2.0 | 24.0 | - | 14.0 | 17.0 | 170 |
| M20 | 2.5 | 30.0 | - | 17.5 | 21.0 | 340 |
M3Pitch: 0.5mm
Hex Head5.5mm
Phillips6.0mm
Pilot Hole2.5mm
Clearance3.2mm
Torque1.1 Nm
M4Pitch: 0.7mm
Hex Head7.0mm
Phillips8.0mm
Pilot Hole3.3mm
Clearance4.3mm
Torque2.5 Nm
M5Pitch: 0.8mm
Hex Head8.0mm
Phillips10.0mm
Pilot Hole4.2mm
Clearance5.3mm
Torque5.0 Nm
M6Pitch: 1.0mm
Hex Head10.0mm
Phillips12.0mm
Pilot Hole5.0mm
Clearance6.4mm
Torque8.5 Nm
M8Pitch: 1.25mm
Hex Head13.0mm
Phillips16.0mm
Pilot Hole6.8mm
Clearance8.4mm
Torque21 Nm
M10Pitch: 1.5mm
Hex Head16.0mm
Phillips20.0mm
Pilot Hole8.5mm
Clearance10.5mm
Torque40 Nm
M12Pitch: 1.75mm
Hex Head18.0mm
Phillips24.0mm
Pilot Hole10.2mm
Clearance13.0mm
Torque70 Nm
M14Pitch: 2.0mm
Hex Head21.0mm
Phillips-
Pilot Hole12.0mm
Clearance15.0mm
Torque110 Nm
M16Pitch: 2.0mm
Hex Head24.0mm
Phillips-
Pilot Hole14.0mm
Clearance17.0mm
Torque170 Nm
M20Pitch: 2.5mm
Hex Head30.0mm
Phillips-
Pilot Hole17.5mm
Clearance21.0mm
Torque340 Nm
Reference Notes
Torque Values
Values shown are for dry threads, Grade 8.8 (Metric) or Grade 5 (Imperial). Reduce torque by 25-30% for lubricated threads.
Pilot Holes
Pilot hole sizes are for threading into steel. For softer materials like aluminum or plastic, use smaller pilot holes.