Torque calculation

ASTM 193 Grade B7 and ASTM 193 Grade B16 Stud Bolts




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  • Bolting torque to develop 50% Bolt Yield Stress at Nut Factor, K=0.16
  • Listed values apply to Never-Seize paste and Fel-Pro lubricant, K=0.16.
  • Listed values apply only to ASTM A193 Grade B7 and A193 Grade B16 Stud Bolts.
  • The torque values are approved for spiral wound graphite and PTFE filled gaskets.
  • The Final Torque Value accounts for 10% bolt relaxation.
  • Listed values do not apply to stud bolts and nuts with PTFE or other coatings.

CAUTION: Care should be used when applying a formula for torque/tension relationships. Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure and/or personal injury.
All data provided is advisory only and its use by anyone is voluntary. The data provided should only be used as a guide. Actual material strengths and fastener conditions may vary.

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