1FK7 compact synchronous motor, flagged end-of-life
The 1FK7042-2AK71-1EG1 is a Siemens 1FK7 compact synchronous servo motor — the smaller-frame brushless servomotor that typically pairs with a SINAMICS S110/S120 drive on positioning axes where the shaft inertia and the rated torque of a compact 1FK7 fit the mechanical load. No official successor is carried in the record, so a board-or-mechanical-spin replacement would have to be confirmed against the current 1FK7 datasheet before committing a redesign.
Sourcing posture for a discontinued servo
Buyers chasing a like-for-like replacement should treat this as a stock-out replacement decision: either secure the 1FK7042-2AK71-1EG1 through surplus while compatible drives remain in service, or commit to a current-production 1FK7 variant after checking the shaft, brake and encoder code against the existing axis.