Machine Screw Torque Calculator

Calculate tightening torque for machine screws and cap screws with various friction conditions per ASME standards.

Target bolt preload force.
N
Bolt nominal diameter.
mm
Thread pitch. M10x1.5: p=1.5 mm.
mm
Steel dry: 0.15, Lubricated: 0.10, Anti-seize: 0.08.
Under-head friction coefficient.
Effective bearing diameter under bolt head.
mm

Results

Required Torque-N·m
Thread Friction Torque-N·m
Collar Friction Torque-N·m
Nut Factor K-
References: Shigley's Ch. 8 — Fasteners; ASME/ANSI B1.1