Bolt Torque & Preload Calculator
Calculate tightening torque and resulting clamp force for metric and imperial bolts.
T = K × F × d (Nm)
K = Nut factor: 0.20 plain, 0.15 zinc+oil, 0.10 PTFE
F_target = 0.75 × σ_y × A_s (reusable)
K = Nut factor: 0.20 plain, 0.15 zinc+oil, 0.10 PTFE
F_target = 0.75 × σ_y × A_s (reusable)