// multi-utility computation suite · offline · instant · precise
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tool.fastener-torque-tension Calculator
Calculates fastener clamping force (preload) from applied torque, thread pitch, and friction coefficient for a given bolt material. Torque is only a proxy for clamping force — friction variation can cause ±30% scatter, which is why critical joints use direct tension measurement.
Inputs
Bolt Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Grade
Reference formula or conversion factor shown for context.
Friction Coeff
Reference formula or conversion factor shown for context.
Results
tightening torque (N·m)
Rotational force (N·m) = force × perpendicular lever arm. High torque at low RPM is ideal for hauling; high RPM suits high-speed applications.
bolt preload (N)
Sample size or count used in the calculation.
proof stress (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
target preload (80% proof)
Reference formula or conversion factor shown for context.
T = K × D × F (K=nut factor≈μ)
A dimensionless multiplier applied in the calculation.