What the 1FK2104-4AK01-0SB0 actually is on a panel
Siemens lists the 1FK2104-4AK01-0SB0 as a SIMOTICS S-1FK2 HD servo motor sized for the SINAMICS S120 drive platform, with a held torque of 1.27 Nm, a rated output of 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 two rating points match the two utility-voltage bands a SINAMICS S120 line typically feeds the converter, so the motor covers both 400 V class and 230 V class cabinets without a re-spec. The drive interface uses a DRIVE-CLiQ plug at M17 on the feedback side and a power connector at M17 on the power side, so the wiring side of the drop looks like a standard Siemens S120 loop rather than a third-party cable set.
Mechanical and feedback package
A D19x40 mm cylindrical shaft, IP65 sealing on the motor body, and a single-turn 22-bit absolute encoder (AS22DQC) shipped as one assembly — feedback resolution that suits high-throughput indexing axes where the controller reads absolute position from the motor every cycle rather than relying on homing runs. IP65 here is the motor-housing seal at the body and shaft entry; the connector rating depends on the mating M17 cordset, so the wet-side duty envelope (coolant splash, oil mist, food-and-bev washdown) is set by the installed cordset, not the motor alone.
Compliance envelope
RoHS compliance is declared since 01-07-06 and the listing carries the current REACH Article 33 information statement for the candidate-list substance check. Export-control classification reads AL:N / ECCN:N_CNDU, which keeps the part out of the dual-use national-security gate on most cross-border orders. Product class C flags the unit as built-to-order — no return-for-credit path, which is the planning letter to set up a non-cancellable line for the buyer.
Logistics and packaging footprint
Order quantity is 1 piece with a pack-out volume of 452.00 x 250.00 x 267.00 mm — single-unit ship dimensions that tell the receiving bench the motor arrives in its own Siemens shipper, not a generic bulk pack. The product class C return note is worth flagging at the desk: this is built to order, so any cancellation or short-ship has to land inside the manufacturer's order window.
Sourcing posture
Product class C and the built-to-order flag set the operational tone: orders commit against a slot rather than walking off a shelf.