12
Appendix
12.1
Tightening torques
Tightening torques
The following tightening torques (Nm) are valid for screws and nuts where
no other specifications are given.
The specified values apply to lightly oiled black (e.g. phosphated) and
coated (e.g. mech. galv., zinc flake plating, screw locking elements)
screws and nuts.
Strength class
Thread
8.8
10.9
12.9
M1.6
0.17 Nm
0.24 Nm
0.28 Nm
M2
0.35 Nm
0.48 Nm
0.56 Nm
M2.5
0.68 Nm
0.93 Nm
1.10 Nm
M3
1.2 Nm
1.6 Nm
2.0 Nm
M4
2.8 Nm
3.8 Nm
4.4 Nm
M5
5.6 Nm
7.5 Nm
9.0 Nm
M6
9.5 Nm
12.5 Nm
15.0 Nm
M8
23.0 Nm
31.0 Nm
36.0 Nm
M10
45.0 Nm
60.0 Nm
70.0 Nm
M12
78.0 Nm
104.0 Nm
125.0 Nm
M14
125.0 Nm
165.0 Nm
195.0 Nm
M16
195.0 Nm
250.0 Nm
305.0 Nm
M20
370.0 Nm
500.0 Nm
600.0 Nm
M24
640.0 Nm
860.0 Nm
1030.0 Nm
M30
1330.0 Nm
1700.0 Nm
2000.0 Nm
Strength class
Thread
8.8
ISO7991
Allen screw
10.9
ISO7380, ISO07381
Fillister head
screw
M3
0.8 Nm
0.8 Nm
M4
1.9 Nm
1.9 Nm
M5
3.8 Nm
3.8 Nm
Strength class
Thread
10.9
DIN7984
Pan head screws
M4
2.8 Nm
Tighten M5 domed cap nuts with a torque of 4.2 Nm.
KR IONTEC
MA KR IONTEC V4 | Issued: 11.05.2021
www.kuka.com
| 335/344
Appendix
Summary of Contents for IONTEC KR 20 R3100
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