What the S-1FK2 HD delivers on a robot or pick-and-place axis
The 1FK2104-4AK10-0SB0 is a Siemens SIMOTICS S-1FK2 HD synchronous servo with an integrated holding brake, sized for high-dynamic axes where the cell needs to hold position when drive enable drops. Stall torque M0 is 1.27 Nm and rated power PN reaches 0.6 kW at nN 6000 rpm on a 380-480 V bus, with a derated 0.4 kW at 3000 rpm on 200-240 V — the higher-voltage point is where this frame gets to use its full speed envelope, which matters when the cycle budget depends on a fast traverse between stations.
Feedback, brake, and the cable side of the handshake
An absolute single-turn 22-bit encoder (AS22DQC) feeds position back through the DRIVE-CLiQ M17 plug — the digital handshake to a SINAMICS S120 drive is closed on a single cable rather than separate resolver + encoder + power leads, which keeps the cell wiring clean and the commissioning project on the same identifier scheme as the rest of the SINAMICS line. The cylindrical shaft is D19 x 40 mm with an IP64 seal around the shaft entry and the power connector sized M17 — IP64 covers splashed coolant and dust but is not a washdown rating, so this frame fits enclosed machine cells rather than open food-and-bev lines. The holding brake is built into the motor housing rather than added externally, which removes a brake-cable run and a second vendor from the BOM, and aligns brake release with drive enable on the SINAMICS side without a separate safety output.
Ordering codes, compliance, and what ships in the box
Siemens groups this motor under Group Code R220 / Product Group 9021 and lists Product class as C — built-to-order, non-returnable, which is normal for configured servo motors and shapes how spares are sourced rather than whether they are available. Lifecycle stage on this code reads current — production is open and the part is configured to order, with one piece per carton at 452.00 x 250.00 x 267.00 mm packaging dimensions.
Sourcing posture for a configured servo motor
Because the part is built-to-order under class C, the realistic sourcing path is a quoted-to-order placement against the configured MPN rather than off-the-shelf shelf stock — pricing and build slot are confirmed at RFQ for the required quantity, and independent distributors can support both new-build BOM lines and spare-motor replenishment for cells already running the same frame.