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Bolt Torque Calculator
Tightening torque estimate for a bolt from diameter, friction nut factor and target preload.
wrench Free Online Tool
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Torque
Compare Your Options And Get Clear Answers
Tightening torque estimate for a bolt from diameter, friction nut factor and target preload.
Bolt Torque Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: T = K x d x F.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Bolt Quick Guide
Typical values for reference.
| d mm | Preload kN | K | Torque N m |
|---|---|---|---|
| 6 | 8 | 0.2 | 9.6 N m |
| 10 | 25 | 0.2 | 50.0 N m |
| 12 | 37 | 0.2 | 88.8 N m |
| 16 | 70 | 0.2 | 224.0 N m |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Bolt Torque Calculator FAQ
Answers to common questions about this calculator.
A friction coefficient lumping thread and bearing friction.
No, use the manufacturer specification.
T = K x d x F.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.