// multi-utility computation suite · offline · instant · precise
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eng.bolt-torque Calculator
Calculates the tightening torque needed to achieve a target bolt preload from bolt diameter, thread pitch, and friction coefficient. The torque-tension relationship (T = KdF) depends on friction — K factors range from 0.1 (lubricated) to 0.2 (dry) affecting achieved clamping force by 50%.
Inputs
D
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Class
Reference formula or conversion factor shown for context.
N
A multiplier applied in the calculation.
Preload Pct
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
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.
preload force (kN)
Sample size or count used in the calculation.
proof strength (MPa)
Sample size or count used in the calculation.
stress area (mm²)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
preload % of proof
Reference formula or conversion factor shown for context.
T = K × D × F_i
Reference formula or conversion factor shown for context.