View recommended bolt torque specifications for KLAMFLEX couplings, including M12 and M16 bolts up to PN16. GRP pipe torque ratings require supplier consultation.
View recommended bolt torque specifications for KLAMFLEX couplings, including M12 and M16 bolts up to PN16. GRP pipe torque ratings require supplier consultation.
Recommended torque values based on coupling size and pipe type
Coupling Size
Bolt Size
Recommended Torque
Pressure Rating
Up to 324mm OD
M12
65–80 Nm
PN16
Over 324mm OD
M16
80–120 Nm
PN16
GRP Pipe Connections
Torque ratings for GRP pipe connections are to be decided on after consultation with the specific GRP pipe supplier, as each supplier develops pipe with its own specific glass filament configuration.