Fronius String Control 250/30 DCD DF - Manual (Page 64)

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Tightening tor-
ques for metric
screw joints
The screw joint is made on the inside of the Fronius String Control 250/30 DCD DF.
The tightening torque for the strain-relief device applies to connected cables.
Size Lock nut/screw joint Screw joint/strain-relief device
M20 6.0 Nm 4.0 Nm
M25 8.0 Nm 5.0 Nm
M32 10.0 Nm 6.5 Nm
M40 13.0 Nm 8.5 Nm