2009 Yamaha F40 Outboard Service Manual, Page 34Get this manual
Special tightening torqueGeneral tightening torque
General tightening torque
This chart specifies the tightening torques for standard fasteners with standard ISO thread pitchTightening torque specifications for special components or assemblies are provided in the applicable sections of this manualTo avoid warpage, tighten the multifastener assemblies in crisscross fashion and progressive stages until the specified torque is reachedUnless otherwise specified, torque specifications require clean, dry threadsComponents should be at room temperatureWidth across flat (A) mm 10 mm 12 mm 14 mm 17 mm Screw size (B) M5 M6 M8 M10 M12 General torque specifications Nm kgfm ftlb 0.5 3.7 0.8 5.9 18 1.8 13.3 36 3.6 26.6 43 4.3 31.7