Lifecycle and what the hot flag means for spares
The 1FK7042-5AF21-1PB0: For an installed 1FK7 line, the eol_hot read does not change the motor's mechanical fit or shaft dimensions, but it does change the procurement math: the lead-time clock is shorter than it looks, and the cabinet needs at least one critical spare on the shelf before the next bearing failure rather than after (cite E*:,).
What the part is and where it sits in the line
1FK7042-5AF21-1PB0 is a 1FK7 compact synchronous servo motor from the Siemens servo motor line, used as the rotating axis on SINAMICS-driven machinery where a small-frame, high-dynamic permanent-magnet synchronous motor is called for (cite E*:,). The motor is listed under the Servo Motors category, filed at the path Servo Motors within the broader Motors & Motor Controls catalog, which is the typical placement for an axis-motor slot inside a machine control panel rather than a stand-alone line-drive (cite E*:,).
Sourcing posture for an eol_hot servo motor
Buyers specifying this motor onto a new line should plan for a formal cross-reference check before committing the BOM slot, because an eol_hot part does not offer the long-tail support a greenfield machine tool builder usually wants (cite E*:).