Torque for NPS 3 Class 300 flange

Suggested torque: 279 ft-lbs

WARNING: For reference only.

Actual torque value should be reached experimentally. Suggested torque here is relevant only for the input parameters listed below.

Input parameters:

  • K Factor: 0.17
  • Target Yield: 75%
  • Bolt: ASTM A193 B7

See bottom of page for calculation details.

Compute torque in seconds.

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NPS 3 Class 300 flanges use 8 bolts. View the 8 bolt torque pattern ↗

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Calculation details

Calculated using the Nut Factor Calculation of Target Torque as defined in ASME PCC-1, Appendix K. Metric: T = KDF/1000 U.S. Customary: T = KDF/12 where: D = nominal diameter of the bolt, mm (in.) F = target bolt load, N (lb) K = nut factor (k-factor) T = Target Torque, N-m (ft-lb)