General information

The material and the keyed connection of the machine shaft (for design X..A) should be dimensioned by the customer according to the loads (e.g. impacts) that will occur.

Depending on the gear unit size, the material of the shaft must have the following minimum yield point for transferring the nominal torque:

• R_e = 320 N/mm² for the sizes X..A100 – X..A290

• R_e = 360 N/mm² for the sizes X..A300 – X..A320

The material of the key must be selected according to the loads that will occur.

The minimum key length specified in the dimension sheet (see following page or in the overall documentation of the gear unit) must be adhered to. If a longer key is inserted, it must be arranged symmetrically to the hollow shaft.

With a through-going machine shaft or axial forces, SEW-EURODRIVE recommends that the machine shaft be designed with a contact shoulder. To prevent loosening of the retaining screw of the machine shaft with reversing load direction, secure it with a suitable thread locking device. If necessary, two eccentric retaining screws can be used.