4.08 kg servo motor in the SINAMICS S120 line, EOL
The 1FK7040-5AK71-1EB0 is a Siemens SIMOTICS S servo motor sized for the SINAMICS S120 drive platform — a compact rotating-shaft motor that pairs with a SINAMICS S120 power module and the matched encoder / cable set for closed-loop positioning or speed control.
Why eol_hot changes the spare-cabinet calculation
An eol_hot servo motor is exactly the part that should already be sitting on a shelf in the maintenance cabinet if it backs a critical axis — once the last-time-buy window closes and no spare is held, a failed drive on a machine tool or packaging line can sit idle for weeks while a replacement is hunted broker-to-broker. Independent distribution is where these motors are now sourced from: new-surplus stock pulled out of factory-sealed trays, factory-pull units from decommissioned cells, and lot-traceable spares from integrators who held spares for in-house service contracts. There is no official pin-compatible successor carried on this part's record — when the motor turns, the BOM line either re-quotes against available stock or the machine axis needs a redesign around a current-production SIMOTICS S frame with a different shaft, connector, and encoder.
What a buyer needs to pin down before specifying
The 1FK7 frame numbering encodes the shaft height, magnet stack length, and brake / encoder options inside the order code suffix — a 1FK7040 is a defined mechanical envelope, and the trailing -1EB0 suffix locks in the winding, feedback, and connector variant; confirming the full string on the nameplate of the motor being replaced is the only way to guarantee the replacement drops onto the existing SINAMICS S120 drive commissioning without re-parameterising the drive.
Sourcing posture for a discontinued Siemens servo
Buyers who need a like-for-like replacement on a live machine today — rather than a forward-looking spare for next quarter — should spell out the SINAMICS S120 drive firmware version and the encoder type currently commissioned, so the quoted unit is guaranteed to plug into the existing drive configuration without a commissioning visit.