What this motor is and where it slots in
The Siemens 1FK2104-4AK00-1SB0 is a SIMOTICS S-1FK2 HD synchronous servo in the 1FK2 family sized for the SINAMICS S120 drive platform, with a stall torque of 1.27 Nm and two rated power points: 0.6 kW at 6000 rpm on a 380-480 V bus, and 0.4 kW at 3000 rpm on a 200-240 V bus. The shaft is D19x40 mm with a feather key, the feedback is a single-turn 22-bit absolute encoder (AS22DQC), and both the DRIVE-CLiQ plug and the power connector are size M17 — meaning the resolver/Drive-CLiQ cable and power lead are the standard S120 motor-side family, not a one-off harness. IP64 sealing keeps the body and optics safe from splash and dust ingress from typical cabinet-adjacent mounting inside enclosures; it is not a washdown-rated enclosure face.
Sourcing posture for the BOM line
The product class is built-to-order: each piece is produced to order, non-returnable against credit, and the quantity unit is 1 Piece — meaning there is no factory-finished shelf stock to draw down, and a BOM line tied to this motor should be quoted with a production lead time, not pulled from same-day inventory. Packaging is a single-piece shipper at 452 x 250 x 267 mm, so receiving dock space and the inbound inspection bay need to plan for one motor per carton at this frame size.
Compliance and documentation the buyer needs on file
RoHS compliance has been declared since 2006-07-01 and REACH Art. 33 candidate-list information is published by Siemens — both of which sit in the standard regulatory file for European shipments without further buyer-side testing. Catalog identifiers Group Code R220 and Product Group 9021 are what show on the Siemens PO/ERP line and should be carried into the procurement system so reorder traffic lands on the same SKU rather than a near-neighbour variant in the same 1FK2 family.
Integrator-side notes before commissioning
The dual voltage rating (380-480 V → 0.6 kW at 6000 rpm; 200-240 V → 0.4 kW at 3000 rpm) means the SINAMICS S120 line filter, DC bus link voltage, and the nameplate line on the drive topology must match the bus the motor is actually being fed from — derating roughly a third when stepping down from the 400 V class to the 230 V class. Because the encoder is DRIVE-CLiQ (M17) rather than a resolver or third-party EnDat/SSI, topology auto-configuration in Starter / TIA Portal handles the encoder handshake — but the M17 cable still has to be on the BOM for the cabinet build, since DRIVE-CLiQ is not a generic cable.