Where the 1FK2 HD servo bolts in
The 1FK2104-4AK01-1SA0 is a SIMOTICS S-1FK2 HD servo motor from the 1FK2 servomotor family, built to pair with the SINAMICS S210 drive line on compact motion axes where the drive and motor share a one-cable solution. The HD (High Dynamic) framing places it in the higher-accel end of the 1FK2 range, sized for short-stroke packaging, indexing tables, and small-format converting machinery rather than long-constant-load conveyor duty. Stall torque is 1.27 Nm with a rated point of 0.6 kW at nN=6000 rpm on a 380–480 V bus, and 0.4 kW at nN=3000 rpm on a 200–240 V bus — the same frame running on the lower-voltage SINAMICS S210 input chassis. The dual rating is the headline number to match when a retrofit swaps the upstream transformer or the panel migrates from 230 V to 400 V class. Feedback is an absolute encoder single-turn 22-bit, designated AS22DQC, with the OCC (One Cable Connection) interface routed through a rotatable M17 plug at the housing. OCC collapses the encoder and power conductors into one cable — the cabinet-side wiring drops to a single drag-chain-friendly cord and the connector orientation can be rotated to follow the cable exit direction during panel layout. Mechanical side: a D19 x 40 mm shaft with feather key, IP65 sealing on the housing. IP65 here means the motor body tolerates typical machine-room splash and casual washdown, but it does not cover hosed-down food-and-bev duty — for that, look at the IP67/IP67G siblings in the same 1FK2 family. The 40 mm shaft length and feather key are the standard coupling fit for this frame size.
Configuration, packaging, and compliance paperwork
Product class is C — manufactured to order, not returnable for credit. The order quantity unit is 1 piece, packed 1 piece per shipper at 452.00 x 250.00 x 267.00 mm. Plan cabinet receiving and unpacking around the single-piece pack; this is not a shelf-sip SKU. For import paperwork, the Group Code on this line is R220, Product Group 9021 — those are the Siemens-internal codes that show up on the packing slip and the commercial invoice.
Lifecycle and the BOM decision
Build-to-order means lead time is confirmed at the RFQ stage against the requested quantity; we do not publish a stock count or a same-day ship posture on this code. If the machine builder needs to compress the panel schedule, the lever is the order quantity and the configured options on the variant, not a desperation buy of the same MPN.