HC-KFS43K — what ships under this code
The HC-KFS43K is a member of the Mitsubishi Electric HC-KFS Series Servo Motor line, rated at 0.4 kW output and 3000 r/min — the low-inertia AC servo slot in the legacy MR-J2S-era family that still shows up on running Japanese machine tool and packaging equipment. Note the absence flags that change which BOM line this fits: the listing carries no electromagnetic brake and no reduction gear, so it is the bare-motor variant — applications needing a fail-safe hold at power-loss need a different -B suffix SKU. Shaft is the K-configuration with keyway, the standard for coupling to a gear or pinion via a keyed interface rather than a friction-fit or tapered mount — the keyway is the anti-rotation feature, so coupling machining must match the K-slot dimensions, not a generic round-bore coupling.
Lifecycle read — EOL hot, sourcing through independent channels
The HC-KFS43K carries an EOL_hot lifecycle flag — meaning the OEM has formally retired the part but market demand still pulls it through independent and surplus channels, with new-old-stock and broker-traceable units the realistic procurement path rather than factory-direct replenishment.
Procurement note for the 0.4 kW line-down case
For a service swap on a running line, the sourcing move is to confirm the existing drive-side electronics (the HC-KFS43K is paired with MR-J2S-class amplifiers in the original BOM) before placing the order — the motor and amplifier form a tuned pair for encoder resolution and commutation, and a mismatched amp on a legacy motor is a common restart-fault source on legacy Mitsubishi cells. On the RFQ, specify quantity, the acceptable condition envelope (new-surplus vs pulled-from-decommissioned-equipment), and any traceability ask — since the part is EOL_hot, condition grading and lot documentation are the variables that move price more than the base configuration does.