Bolt Torque Calculator

Calculate the required tightening torque for bolts based on size, grade, and friction.

Bolt Specification

Standard

Nominal Diameter

Clamp Load (P)

lbs

Friction Coefficient (K)

Custom K-Factor

Torque Requirements

Enter specs to calculate required torque

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.

💡

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.

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)

Used with this

Similar tools that might be useful

AC Room Size Calculator

Find the perfect AC unit size based on room dimensions and environmental factors.

AC Tonnage Calculator

Calculate air conditioning capacity in tons and BTU for your home with precision.

Air Changes per Hour (ACH)

Measure ventilation effectiveness by calculating room air replacement rates.