Appendix
9.2.4 Tightening torques
Tighten bolts diagonally using a torque wrench. The fol-
lowing figures apply to new bolts and nuts.
Thread gage Tightening torque [Nm]
M8 25
M10 35
M12 50
M16 80
Tab. 18 Steel/cast pairing
Thread gage Tightening torque [Nm]
M10 45
Tab. 19 Socket head cap screw 914.1 - steel/steel pairing
Screw down hand-tight for plastic/plastic pairings, e.g.
impeller screw 90 6 .
EN – 02 BA-2005.07 NPC series 41
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