Fasteners, shafts & power transmission

Mechanical Engineering calculators

Calculators for bolted joints, shaft power, gearing and machine elements — the everyday mechanical design checks, in metric and imperial units.

• Bolt Torque & Preload Calculator
  Target preload to tightening torque — short-form nut factor or the full friction decomposition, with the scatter band that torque control actually delivers.
• Shaft Power, Torque & Speed Calculator
  P = T·ω solved either way — plus efficiency, service factor, torsional stress, twist and minimum shaft diameter.