A linear stepper motor with an actuating rod in a housing with a stator, a rotor and a replaceable bearing shield fixed on the stator is provided. The rotor includes a threaded shaft. The bearing shield defines two guide cut-outs. The actuating rod includes a spindle nut portion engaged with the threaded shaft, a replaceable coupling shank for a customer-specific actuating element, and two opposing parallel fork legs which link the spindle nut portion and the coupling shank and which are guided in a rotation-locked manner through the two guide cut-outs.