What the 1FK7042-5AF71-1 actually is
The 1FK7042-5AF71-1...: The 1FK7042-5AF71-1 is a SIMOTICS S synchronous servo motor from the Siemens 1FK7 Compact family — a short-stack rotor delivering 3.0 Nm of rated torque at 3000 rpm (0.82 kW) with natural convection cooling, so no fan cable or blower duct has to be engineered into the machine envelope. It mounts in an IM B5 flange footprint (with IM V1 and IM V3 alternate orientations on the same frame), and the power/signal connector plug rotates through 270°, which is the practical detail that decides whether the cable dress clears the adjacent axis or the guarding without a right-angle adapter.
Lifecycle read — what eol_hot means on this line
For a commissioning engineer this changes the BOM math: the motor will still drop onto a SINAMICS drive and tune through the same parameter set as any other 1FK7 Compact, but replacement spares for the installed base have to be sourced from independent channels rather than re-ordered on a normal Siemens lead time.
Mechanical envelope and panel-side integration
The Compact shaft height class keeps the motor short end-to-end relative to its torque, which is what lets a multi-axis gantry or a small indexing table stack the drives close together without the motor bodies colliding on the frame. Naturally cooled (no shaft-mounted fan) means the thermal boundary is the motor surface and the mounting flange — the flange contact to the machine bed or gearbox housing is part of the thermal path, not just the mechanical one, so a painted spacer or a thermal interface pad under the flange moves the continuous-torque number.