What the part is and where it sits on a Siemens motion axis
The Siemens 1FK7033-4CK71-1TG0 is a 1FK7 high-dynamic synchronous servo motor in the compact low-inertia class — the rotor is sized for high-acceleration cyclic duty rather than continuous heavy torque, which is why it lands on pick-and-place axes, small indexing tables and packaging-form-and-cut stations where the cycle time is dominated by acceleration and deceleration. On the panel side the motor interfaces to a Siemens SINAMICS drive (typically S110 or S120) over the DRIVE-CLiQ feedback path that the 1FK7 encoder carries internally — encoder and resolver variants in the order-code tail determine which drive controller family auto-commission the motor without manual parameter entry.
Lifecycle read — what eol_hot actually means for the BOM line
The order code carries an EOL hot-stage designation, meaning last-time-buy notices have been issued and the remaining production window is constrained — a spare-parts replenishment order placed today may not be repeatable from the factory twelve months out, so the BOM decision is whether to cover the full service-life requirement now or accept the independent-channel risk later. With no official L-record successor published alongside the EOL hot-stage marker on this order code, the documented second-source path is not on the record from Siemens — any cross-reference has to be qualified parametrically against the replacement 1FK7 frame or the 1FK8 successor family, not assumed pin-compatible. For an installation already running SINAMICS firmware the field-replacement path that does NOT require a firmware or wiring change is to source against the same 1FK7033-4CK71-1TG0 code through independent distribution — quotes are returned with lot traceability and conformity documentation so the spare can be accepted against the same engineering baseline.
Physical handling — 3.18 kg in the cabinet and on the shaft
Because the encoder and resolver signals are sensitive to cable routing, the feedback cable alongside the power cable needs a screened run with the screen bonded at the drive-end gland — skipping the screen termination is the single most common commissioning fault on this class of axis and shows up as following-error faults under dynamic moves.
Compliance paperwork the buyer should expect with the shipment
For a 1FK7-class servo motor the conformity dossier normally accompanies the shipment as a Siemens declaration of conformity covering the Low Voltage Directive and the relevant EMC standard for the drive system as installed — a CE-marked motor in this class is also typically backed by a manufacturer's RoHS and REACH statement covering the materials in the housing, encoder PCB and stator insulation system. Independent-channel sourcing does not weaken that documentation chain — the declaration of conformity and the material-compliance statements travel with the serial-numbered unit, and the buyer's supplier-quality sign-off should accept them against the same audit evidence that an OEM-direct shipment would carry, provided the lot traceability is intact.