What this motor is, and where it lands on a SINAMICS S120 rack
The 1FK2104-5AK10-1SB0 is a SIMOTICS S-1FK2 HD servo motor from the 1FK2 servomotors family for SINAMICS S120 — a compact synchronous servo with an integrated holding brake and an absolute single-turn 22-bit encoder (AS22DQC), wired back to the drive via the DRIVE-CLiQ plug M17. It delivers M0 = 2.4 Nm continuous stall torque and PN = 1.07 kW at nN = 6000 rpm on a 380–480 V supply, dropping to PN = 0.75 kW at nN = 3000 rpm on 200–240 V — the same frame running on two different bus regimes rather than two different motors. Because this motor ships with a DRIVE-CLiQ interface, it is selected for the SINAMICS S120 line where the drive auto-identifies the motor and pre-loads the electronic nameplate on first power-up — the commissioning engineer does not have to key in encoder resolution or pole count manually.
Mechanical package and on-machine fit
The shaft is D19 × 40 mm with a feather key, IP64 sealing on the body, and the holding brake integrated in the housing — the standard mounting for a feed axis or small positioning spindle where the brake must hold position with the drive de-energised. Power connector size M17 and DRIVE-CLiQ plug M17 are both rotatable on the motor housing; routing the cables through the cable duct has to leave clearance for the minimum bend radius Siemens specifies for the pre-assembled cables — not a generic M17 spec.
Compliance and classification
Siemens has held RoHS conformity for this part since 01-07-06, and the product falls under the standard REACH Art. 33 duty-to-inform regime — the candidate-list update is published through the Reach Information portal rather than a per-shipment document. Export-control markings read AL: N / ECCN: N_CNDU, so the part is not licence-controlled for standard commercial export channels — paperwork at the shipping dock stays at the commercial-invoice level.
Sourcing posture for the BOM line
Lifecycle stage is current and production status is Active on the manufacturer record — this is not a last-time-buy position and the 1FK2 family continues to ship into SINAMICS S120 builds. The product class is built-to-order: each unit is produced against a sales order, cannot be returned for credit, and is not held as reusable stock — lead time and quantity pricing are confirmed at RFQ rather than read off a shelf. Packaging is single-piece at 452 × 250 × 267 mm on a Quantity Unit of 1 Piece, Group Code R220, Product Group 9021 — order intake and incoming inspection should expect one motor per shipper, not multi-packs.