Headline motion envelope and what it sizes for
The Siemens 1FK2104-4AK11-0SB0 is a SIMOTICS S-1FK2 HD servo motor from the 1FK2 servomotors for SINAMICS S120 family, carrying 1.27 Nm of stall torque and rated 0.6 kW at 6000 rpm on a 380-480 V bus — a 0.4 kW / 3000 rpm rating is also published for 200-240 V operation. Lifecycle stage is recorded as current on the part file, so this is not a discontinued code — it remains an active SINAMICS S120 axis on Siemens' catalog.
Encoder, brake, and the loop it sits in
Feedback is an absolute encoder single-turn 22-bit (AS22DQC), which gives 4 million counts per rev — enough resolution that a tightly tuned SINAMICS S120 drive holds the micron on a well-staged axis. An integrated holding brake is part of the build, intended for vertical-axis and standstill-locking duty rather than cyclic dynamic braking. The shaft is a cylindrical D19x40 mm, and the housing carries IP65 protection. Both connectors are size M17 — the DRIVE-CLiQ signal plug and the power plug — keeping the cable bundle consistent with other 1FK2 axes on the same cabinet.
Compliance posture and shipment handling
The product class is C: manufactured/produced to order, not reusable and not returnable against credit — order quantities are firm. Carton size is 452 x 250 x 267 mm for one piece.
Sourcing posture for an active 1FK2 axis
Group code R220 and product group 9021 are the Siemens internal identifiers stamped on the nameplate for this servo motor, used to reconcile the PO line against the shipping unit.