Utilize our Metric Bolt Torque Calculator to determine the precise torque required for your fasteners. Accurately calculate the ideal tightening force based on the bolt's diameter, K-factor, and target preload. Essential for ensuring joint integrity and preventing failures in engineering and construction applications.
Formula:
The fundamental formula for calculating metric bolt torque is:
T = K × D × P
Where:
- T = Torque (Newton-meters, N·m)
- K = Nut Factor (or k-factor, dimensionless coefficient representing friction in the thread and under the bolt head/nut)
- D = Nominal Bolt Diameter (meters, m)
- P = Target Bolt Preload or Clamping Force (Newtons, N)
Our calculator simplifies this by taking inputs in common units (mm, kN) and converting them for the calculation.