What this motor is and where it bolts in
The 1FK2104-4AK01-0SA0 is a member of the SIMOTICS S-1FK2 HD servo motor family, built to pair with a SINAMICS S210 drive — the encoder resolution, OCC interface, and M17 rotatable connector all line up with that converter line, so substituting a non-S210 drive means losing the one-cable feedback path the motor is wired for. On the shaft side it carries a cylindrical D19 x 40 mm stub and the body is rated to IP65, which is enough for plant-floor cabinet sides and machine interiors where occasional washdown splash or coolant mist reaches the motor envelope — the rating is about resisting directed water jets, not full immersion.
Ratings and what they mean on the bench
Standstill torque M0 is 1.27 Nm and the rated point is PN = 0.6 kW at nN = 6000 rpm when fed from a 380-480 V bus, or PN = 0.4 kW at nN = 3000 rpm from a 200-240 V bus — the same winding runs both voltage classes, the lower supply simply shifts the field-weakening corner and trims continuous power. Position feedback is an AS22DQC absolute encoder, 22-bit single-turn, which gives 4 million counts per revolution over the OCC (One Cable Connection) link to the S210 — no separate resolver cable to route, no extra connector to land at the drive, but it also means the drive side has to be configured for the OCC protocol before commissioning will accept the encoder.
Ordering class and compliance trail
Siemens classifies this motor as class C — built to order, no reuse or return-for-credit — so a BOM line that gets cancelled mid-build leaves the buyer holding the part, and a wrong encoder variant or shaft detail on the order can't be swapped under RMA. RoHS compliance has been in place since 01-07-06 and the part carries a REACH Art. 33 disclosure obligation, meaning any substance-of-very-high-concern update from Siemens has to flow through to the buyer; export classification is AL:N with ECCN:N_CNDU, so no licence is required for shipment to typical industrial destinations. Catalog metadata places it under Group Code R220 and Product Group 9021 — useful as a cross-check against the Siemens configurator or an existing BOM import, less useful as a selection parameter.
Sourcing posture for a line-down spare
Lifecycle stage is reported as current and active, so this is not a withdrawal-list servo — a planned retrofit or capacity addition can be specified against current production without a last-time-buy clock. Production quantities quote against the BOM from independent distribution through an RFQ; current pricing and lead time confirm at quote time. Each unit ships in the Siemens single-piece pack at 452 x 250 x 267 mm, so receiving needs dock space for the shipper rather than small-parcel handling.