Tightening torques: Recommendations for gear unit mounting with foot-mounted design

The following table shows the thread sizes and tightening torques for mounting the individual gear unit sizes.

Mount the gear unit according to the order-specific mounting position and mounting surface using all the bores provided for the foot screw fittings.

The values given in the table for the recommended tightening torques for foot screw fittings are based on the following friction coefficients.

Friction coefficient μGK for thread
and head contact surface

Strength class of the screws

0.14 – 0.24

8.8

0.09 – 0.14

10.9

Do not lubricate the screw connections during installation.

If you use screw connections with another friction coefficient, adapt the tightening torques accordingly.

Size

Screw/nut

Tightening torque Nm
Strength class 8.8
Strength class 10.9

X100 – 110

M20

460

X120 – 130

M24

795

X140 – 150

M30

1590

X160 – 170

M36

2760

X180 – 190

M36

2770

X200 – 230

M42

4410

X240 – 280

M48

6650

X290 – 320

M56

10600

Use one of the following recommended tools to tighten the screw connections:

  • Torque wrench
  • Motorized torque wrench with dynamic torque measurement
  • Torque-controlled, gradual hydraulic tools