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Bolt Torque Calculator
Recommended torque values for ASTM A193 B7 studs on ASME B16.5 raised face weld neck flange connections. Starting reference values. Final torque should follow gasket manufacturer and project bolt-up procedure.
Recommended Torque
420 ft-lb
B7 stud, 1" diameter, lubricated threads
Values reference target preload around 50 percent of yield for B7 studs on spiral-wound graphite gaskets. For RTJ gaskets, fire-safe service, or non-standard gasket materials, refer to the gasket manufacturer data sheet. Torque to 30 percent, 60 percent, then 100 percent in a cross pattern.
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