Bolt Torque Calculator

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Calculates the required torque for tightening a bolt, based on bolt diameter, thread pitch, and desired clamping force.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Bolt Diameter (mm), Thread Pitch (mm), Target Clamping Force (kN), and Friction Coefficient in the units shown.

Step 2

Read Required Torque (Nm) and Tensile Stress (MPa) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Bolt Diameter (mm): 10; Thread Pitch (mm): 1.5 mm; Target Clamping Force (kN): 50; Friction Coefficient: 0.15

Required Torque (Nm): 9.887326163 Nm; Tensile Stress (MPa): 636.6203101 MPa

Bolt Diameter (mm): 12; Thread Pitch (mm): 1.75 mm; Target Clamping Force (kN): 75; Friction Coefficient: 0.15

Required Torque (Nm): 17.67782079 Nm; Tensile Stress (MPa): 663.1461564 MPa

Bolt Diameter (mm): 8; Thread Pitch (mm): 1.25 mm; Target Clamping Force (kN): 30; Friction Coefficient: 0.15

Required Torque (Nm): 4.793663081 Nm; Tensile Stress (MPa): 596.8315407 MPa

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