What this order code actually is
The 1FK7042-2AK71-1CH1-Z+Q31 is a Siemens compact synchronous servo in the 1FK7 family — a low-inertia brushless servo sized for high-dynamic positioning on packaging, small-format converting, and similar short-cycle motion axes.
Lifecycle read — the headline for this listing
Lifecycle stage is recorded as eol_hot, which means the manufacturer has formally retired the part and any remaining supply routes through independent distribution rather than the normal Siemens factory channel. For a buyer this shifts the procurement posture from a quoted production-line delivery to a lot-and-trace buy — each unit has to be qualified on incoming inspection against the nameplate, and lead time is dictated by what the independent channel can locate, not by a factory schedule.
Field-side realities of an EOL servo swap
A commissioning engineer pulling this code out of the surplus channel needs to verify the encoder variant and the option suffix (-Z+Q31) against the original BOM before mounting — the 1FK7 family shares the same frame across resolver, absolute, and multi-turn encoder configurations, and a swapped encoder protocol will throw a drive-side F-code at first commissioning.