Bolt Torque Calculator
Precision torque calculations for engineers and mechanics
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Torque Calculation Parameters
Torque Results
Recommended Torque
—
Nm
Tensile Stress Area
—
mm²
Clamp Force
—
kN
Recommendations
Enter your bolt parameters and click “Calculate Torque” to get recommendations for proper tightening procedures.
About Bolt Torque Calculation
Proper bolt torque is critical for joint integrity and safety. Under-torquing can lead to joint loosening, while over-torquing can damage threads or break the bolt. This calculator uses industry-standard formulas to determine appropriate torque values based on bolt size, grade, and application conditions.
How to Use This Calculator
- Select your bolt size (diameter)
- Enter thread pitch (metric) or TPI (imperial)
- Select the bolt grade/class
- Choose lubrication condition
- Select joint material
- Choose desired torque units
- Select appropriate safety factor
- Click “Calculate Torque”
Important Notes
- Always consult manufacturer specifications when available
- Critical applications should be verified by a qualified engineer
- Lubrication significantly affects torque values
- Use calibrated torque wrenches for accurate tightening
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