MTU 12V4000G34F Operating Instructions Manual page 244

Tightening torques for union nuts as per DIN 3859-2
1 Union nut
2 Screw fixture
3 O-ring
4 Linear ball bearing
Union nut: On installing the ball-type union, after tightening the union nut firmly by hand (noticeable increase
in force), it should be tightened another 1/4 turn (90°) past this point.
Tightening torques for spigot unions with O-ring to ISO 6149-2
M8 x 1
M10 x 1
M12 x 1.5
M14 x 1.5
M16 x 1.5
M18 x 1.5
M20 x 1.5
M22 x 1.5
244 | Appendix A | MS15060/01E 2018-12
Thread
1)
Torque (Nm) +10%
10
20
35
45
55
70
80
100