Match the inertia first, then read the torque
The Siemens 1FK2104-4AK00-1MB0 is a SIMOTICS S-1FK2 HD servo in the 1FK2 family sized for SINAMICS S120, delivering M0 = 1.27 Nm with PN = 0.6 kW at nN = 6000 rpm on a 380–480 V bus (or PN = 0.4 kW at nN = 3000 rpm on 200–240 V) — the small-frame high-dynamic slot where load-to-motor inertia ratio decides whether the velocity loop stays quiet or sings. Feedback is the AM22DQC absolute encoder at 22-bit singleturn plus 12-bit multiturn over DRIVE-CLiQ — that resolution is what lets the S120 close a tight position loop without the cogging torque showing up at low speed, so sizing the gearbox and coupling before the BOM freezes matters more than picking the next frame up.
Encoder, shaft and what the cabinet actually sees
The shaft is D19 x 40 mm with feather key, and the connectors are M17 on both the DRIVE-CLiQ signal side and the power side — same family, same coupling, so a cabinet cutout only needs the M17 cordset bend radius, not two different glands. IP64 means dust-protected and splash-resistant, not washdown — it suits a machine enclosure or a gantry behind a guard, but a food-grade or outdoor cell wants a higher-rated housing rather than an IP64 motor with a sealed cable. The 22-bit + 12-bit multiturn AM22DQC over DRIVE-CLiQ keeps commissioning to a one-cable plug at the motor — the S120 reads the electronic nameplate on first connect, so the encoder ID and winding data land in the drive topology without manual entry.
Lifecycle and BOM intake
Compliance paperwork on the record is RoHS-conformant since 01-07-06 and REACH Art. 33 duty-to-inform per the current candidate list; export classification reads AL:N / ECCN:N_CNDU, which simplifies cross-border paperwork but still needs the receiving site's import review. Internal classification is Group Code R220 / Product Group 9021 — the codes the Siemens configurator and the order-intake screen look for, so the PO line is cleanest when those match the quote.