M10 Bolt Preload
M10 bolt preload depends on torque and nut factor. The nominal diameter is 10 mm, but friction determines how much clamp force the torque actually produces and how that preload compares with proof load.
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M10 preload formula
F = T / (K * 0.010)
30 N*m dry example
With K = 0.20, 30 N*m on M10 gives F = 15,000 N, or 15 kN.
Proof-load context
For M10x1.5 with 600 MPa proof strength, 15 kN is about 43% of estimated proof load; 75% proof load takes about 52 N*m at K = 0.20.
30 N*m lubricated example
With K = 0.15, the same 30 N*m gives F = 20,000 N, or 20 kN.
Related pages
- Bolt preload torque calculator - calculate clamp force, proof-load utilization and preload scatter.
- Bolt preload formula - equation and nut-factor definitions.
- Bolt preload explained - joint mechanics, proof load targets and preload scatter.
- Bolt torque spec chart - starting torque values by size and grade.