Torque Calculator
Enter the following Information:
Input
Value
Units
Nominal Diameter
Pitch
K Factor
Proof Load Stress (yield):
Length of Engagement
Torque Recommendations for Metric and Fractional System: Click Here
Nut Factor (K Factor)
When working with fasteners of different frictional characteristics, the Nut, or K, Factor is used in place of a calculated coefficient of friction. The Nut Factor is an experimentally determined, dimensionless coefficient that approximates the friction of various materials and platings when applied to threaded joints. Nut Factors are generalized averages that may vary greatly given all of the variables in any bolted joint, but are useful in approximating theoretical torque values.
(L) - length of thread engagement is the length of which the female threads contact the male threads
(D) - bolt nominal diameter (inches, millimeters)
Proof Load Stress (0.2% yield)
Torque Calculation Work Sheet
English Units
Input
NOM
- .5
TPI
- 1
K Factor
- 1
Proof Load Stress or Yield Requirement
- 1
Length of Engagement
- 1
Result
- Inches = 0 Ft-lb
Results
Proof Load Calculation
- Proof Load Stress: PSI
- Stress Area: 2
- Proof Load: Pounds
Clamp Load Calculation
- Proof Load: Pounds
- Percent of Proof: %
- Clamp Load: Pounds
Standard Torque Calculation
- Clamp Load: Pounds
- Bolt Diameter: Inches
- K Factor 1
- Torque: Ft-lb
Spiralock Torque Calculation
- Torque: Ft-lb
- +10 % for SL: Ft-lb
- Torque: Ft-lb (Dry)
Length of Engagement Correction
- Torque: Ft-lb
- Percent Engagement: %
- Corrected Torque: Ft-lb
These torque values are recommended starting values. Trial assembly should be tested for actual results.