Bolt Torque Calculator

Calculation-only bolt preload and tightening torque verification with mating-part checks and a governing Pass/Fail verdict.

Input Parameters

Metric Size Preset

Bolt Diameter d (mm)

Thread Pitch p (mm)

Bolt Yield Strength Fy (MPa)

Nut Factor K

Bolt Safety Factor

Mating Part Type

Mating Yield Strength (MPa)

Engagement Length Le (mm)

Plate Thickness t (mm)

Hole Diameter dh (mm)

Washer/Head Diameter dw (mm)

Mating Safety Factor

Applied External Load (kN)

PENDING

Tensile Stress Area-

Allowable Bolt Preload-

Recommended Torque-

Thread Strip Capacity-

Plate Bearing Capacity-

Pull-Through Capacity-

Governing Check-

Governing Capacity-

Utilization Ratio-

For preliminary engineering calculation support only. Final design verification and professional sign-off are required.