Definition — a 1FK2 HD servo sized for a S210 drive slice
Siemens 1FK2104-4AK10-0SA0 is a SIMOTICS S-1FK2 HD servo motor from the 1FK2 family intended to run on a SINAMICS S210 drive, with a 1.27 Nm static stall torque and a 0.6 kW rated point at 6000 rpm on the 380–480 V bus (and a 0.4 kW point at 3000 rpm on the 200–240 V bus). It carries an integrated holding brake, an absolute single-turn 22-bit encoder (AS22DQC), and an OCC interface terminated through a rotatable M17 plug — meaning the cabling, feedback and brake leads all land on one connector that can be clocked to the cabinet routing instead of the other way around. Cylindrical D19 × 40 mm shaft, IP64 sealing, and the standard 1FK2 frame footprint make it a direct match for the S210 drive's 1FK2 motor-side firmware blocks.
Ratings that drive the fit decision
The headline numbers — M0 = 1.27 Nm, PN = 0.6 kW at nN = 6000 rpm on 380–480 V — pin the sizing: this is the low-inertia HD frame member of the 1FK2 line, suited to high-acceleration axes (packaging, indexing tables, small gantries) rather than constant-torque heavy-rolling service. The dual-voltage rating (0.4 kW at 3000 rpm on 200–240 V) confirms the winding is the same physical unit across regional mains — the BOM line is identical whether the cabinet ships to a 230 V or a 480 V site, which removes a stocking split. IP64 with a holding brake and a single-turn absolute encoder is the working envelope most S210 axes are specified for: dust-tight and splash-resistant, no need for washdown-rated sealing, but a real holding brake for vertical or unbalanced loads. The 22-bit AS22DQC gives 4.19 million counts per turn — resolution is not the bottleneck on this frame; commutation accuracy at zero speed is what the absolute single-turn buys you after an E-stop or power cycle, with no homing run required before the next motion.
Lifecycle and the procurement line
Siemens lists the lifecycle stage as current and the product class as made-to-order — a configured servo built per order rather than a stocked SKU. For a buyer this means the lead-time clock starts when the order code is released to the Siemens channel, not when a shelf is swept; independent distribution sources the same configured build on the same factory line, and the order code itself is the authoritative specification. Group Code R220 / Product Group 9021 are the internal identifiers carried on the Siemens price list and declaration pack — they map cleanly to the 1FK2 / S210 family on the ordering system, so the procurement record stays consistent with what the factory will build and what the panel nameplate will read. Compliance footprint is the standard Siemens industrial servo set: RoHS conformity since 01-07-06 and REACH Art. 33 duty-to-inform disclosure carried through the product family; export-control class is AL:N / ECCN:N_CNDU — no export licence gate for routine commercial shipments, which keeps cross-border stocking and broker-channel supply uncomplicated.