Calculate the required tightening torque for bolts based on size, grade, and friction.
Bolt Specification
in
lbs
Torque Requirements
Enter specs to calculate required torque
About this calculator
Overview
Bolt torque is the rotational force applied to a fastener to create tension (clamp load). Achieving the correct torque is essential to ensure a joint remains tight without stripping the threads or snapping the bolt.
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Pro Tips
Always clean threads and remove rust before tightening for consistent results.
Lubricating a dry bolt can double the clamp load for the same torque - be extremely careful!
Tighten bolts in a 'star pattern' for flanges or wheels to distribute pressure evenly.
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Fun Facts
"About 90% of the torque applied to a bolt is used to overcome friction, while only 10% actually produces clamp load."
"Most mechanics use a 'click-type' torque wrench, but digital ones can provide much higher accuracy."
"Reusable bolts can lose their clamping efficiency over time as the threads stretch slightly."
Formula: T = K × D × P
T: Torque
K: Friction Factor
D: Diameter
P: Clamp Load (Tension)
