Inputs Saved
Common range: 70–80 % of proof load for reusable joints, up to 90 % for one-time (yield) tightening.
Formula. T = K · F · d, where T = torque, K = nut factor (lubrication-dependent), F = bolt preload (axial clamp force), d = nominal bolt diameter. Proof load = Sp · At.
Results
Tightening Torque
—
T = K · F · d
Target Preload (F)
— kN
Proof Load
— kN
Tensile Stress Area (At)
— mm²
Tensile Strength
— MPa
For preliminary use. Real installations should account for joint stiffness, embedment, gasket creep, scatter from K-factor (±25 % typical), thread engagement, and applicable code (e.g. ASME PCC-1, VDI 2230). Critical joints should be verified by torque-and-angle or direct preload measurement.