What this motor is and where it sits in the line
The Siemens 1FK7042-5AF21-1DG0 is a synchronous servo motor from the 1FK7 compact family, used as the rotating actuator on a SIMODRIVE or SINAMICS servo axis — typically driving feed axes, auxiliary spindles, or small-format handling axes where the high dynamic response of a permanent-magnet synchronous design matters more than the raw torque of an induction motor.
Lifecycle status and the channel that actually carries it
For a buyer, that changes the math on landed cost: independent surplus and broker channels carry lot-specific stock with no factory allocation, so unit price moves with quantity and condition rather than a published ladder, and each shipment needs its own paperwork trail — CoC, original Siemens nameplate vs. PO, and the storage history of the lot — before it can be imported against a BOM line.