Torque Calculation
- 15 Oct 2024
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Torque Calculation
- Updated on 15 Oct 2024
- 1 Minute to read
- Contributors
- Print
- DarkLight
- PDF
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For imperial:
For Metric:
Torque calculations:
Symbol | Name | UoM | Source |
|---|---|---|---|
T | Torque | ft-lbs | Calculated. |
Sb | Target Bolt Stress | psi | LOOKUP (based on Flange SIZE and CLASS RATING). If inputs missing then 70% of the Bolt Yield Stress is suggested. See Target Bolt Stress Lookup. |
A | Bolt tensile stress area | in2 | Calculated. |
D | Bolt nominal diameter (stud size) | in | LOOKUP (based on Flange SIZE and CLASS RATING). See Stud Size Lookup. |
K | Nut factor | dimensionless | User entered value. (Typically a value of 0.17 is used for uncoated studs properly lubricated with nickel-based anti-seize, and 0.12 for Teflon-coated studs is used.) |
Example:
Calculating the torque required for a bolt using both imperial and metric formulas.
Imperial Calculation if:
Target Bolt Stress (Sb): 73,505 psi
Bolt Tensile Stress Area (A): 0.969 in²
Stud Size (D): 1.25 in
Nut Factor (K): 0.12
Metric calculation if:
Target Bolt Stress (Sb): 560.8 MPa
Bolt Tensile Stress Area (A): 6.25 cm²
Stud Size (D): 31.75 mm
Nut Factor (K): 0.12
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