MTU 20V4000M93 series Operating Instructions Manual page 33

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
Thread
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 1)
M22 x 1.5
Torque (Nm) +10%
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10
20
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70
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