Fastener and Screw / Bolt Design Formula Design Data
Strength of Materials

See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.

This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Minimum three (3) inputs are required then select "Find" button to get unknown

This Calculator Requires a JAVA enabled browser to function properly.

Instructions:

1) Enter known number values (two inputs minimum) within center located input boxes.

2) Select associated lower button to calculate unknown value.

Note: This calculator initially assumes dry and perfect threads made from steel and/or zinc plated. Calculated values are approximate. Calculated values do not compensate for materials stiffness.

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• Stud Preload Calculator
• Bolt Preload Tension Equation and Calculator
• Torque vs Tension Bolts Table Chart SAE J429 Bolts
• Threaded Hole Fastener Pullout Stress
• Screw Stress Area 100 ksi & Greater
• Bolt Stress Area less Than 100 ksi

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