Bolt Torque Calculator

How to Apply Torque

• 1.Use a calibrated torque wrench
• 2.Insert bolts hand-tight
• 3.Tighten in crisscross pattern (never in sequence)
• 4.Apply torque in multiple passes (2-3 passes typical)
• 5.Re-check torque after 1-2 hours of operation

Lubrication Impact

Lubrication dramatically affects torque value because it reduces friction between bolt and threads:

• Dry: Highest torque value (maximum friction)
• Machine Oil: ~27% reduction from dry (moderate friction)
• Molybdenum (MoS₂): ~40% reduction from dry (excellent lubricant)

Critical Warning

Over-torquing is a common cause of flange leakage and stress corrosion cracking.Under-torquing allows bolts to loosen under vibration and thermal cycling. Always use the correct torque value for your specific conditions.