Hose/Line HVAC

Tightening Torque for Refrigerant Pipes
Outside thread diameter
5/8 in 17 ± 3 NM (12 ± 2 ft lb)
3/4 in 24 ± 4 NM (17 ± 3 ft lb)
7/8 in 33 ± 4 NM (24 ± 3 ft lb)