Tightening Torque - Parker NK Series Technical Manual

4.2.2. Tightening torque

The table below gives the average tightening torques required regarding the fixing
screw diameter. These values are valid for both motor's feet and flange bolting.
Screw diameter
M2 x 0.35
M2.5 x 0.4
M3 x 0.5
M3.5 x 0.6
M4 x 0.7
M5 x 0.8
M6 x1
M7 x 1
M8 x 1.25
Warning: After 15 days, check all tightening torques on all screw and
nuts.
Tightening torque
0.35 N.m
0.6 N.m
1.1 N.m
1.7 N.m
2.5 N.m
5 N.m
8.5 N.m
14 N.m
20 N.m
81 - PVD 3664_GB_NK-November 2016.Docx
Screw diameter
M9 x 1.25
M10 x 1.5
M11 x 1.5
M12 x 1.75
M14 x 2
M16 x 2
M18 x 2.5
M20 x 2.5
M22 x 2.5
M24 x 3
Tightening torque
31 N.m
40 N.m
56 N.m
70 N.m
111 N.m
167 N.m
228 N.m
329 N.m
437 N.m
564 N.m