Torque Pattern
Cross-pattern tightening sequence with ASME PCC-1 torque values
4" Class 150 requires 8 bolts
Target Torque
60ft-lbs
5/8" B7 studs • Lubricated (K=0.15)
Cross-Pattern Tightening Sequence
Bolt Order
15263748
ASME PCC-1 Multi-Pass Sequence
Pass 118 ft-lbsSnug + 30% target
Pass 236 ft-lbs60% target
Pass 360 ft-lbs100% target
Pass 460 ft-lbsCircular pass (verify)
Based on ASME PCC-1 Guidelines for Pressure Boundary Bolted Flange Joint Assembly