{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"HC-KFS43K","brand":"Mitsubishi Electric","brandSlug":"mitsubishi","productSlug":"HC-KFS43K","canonicalUrl":"https://aoctrl.com/mitsubishi/HC-KFS43K","factsUrl":"https://aoctrl.com/api/mcp/products/HC-KFS43K","rawCanonicalId":null},"summary":{"shortDescription":"Mitsubishi Electric HC-KFS Series Servo Motor, HC-KFS43K, 0.4 kW rated output, 3000 r/min, keyway shaft, no electromagnetic brake, no reduction gear.","salesMarkdown":"## 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.","metaTitle":"Mitsubishi HC-KFS43K Servo Motor, 0.4 kW, 3000 r/min","metaDescription":"Mitsubishi HC-KFS43K HC-KFS series servo motor, 0.4 kW rated output at 3000 r/min, keyway shaft, listed as EOL — quoted to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Servo Motors with Brake"],"specifications":{"title":"HC-KFS43K","Weight":"1.45 Kg","Shaft type":"K = With keyway (With key) , 23 to 73","Product No.":"HC-KFS43K","Rated speed":"3 = 3000[r/min]","description":"Mitsubishi Servo Motor","Product type":"HC-KFS Series Servo Motor","Reduction gear":"None = Without","Shipping weight":"3 Kg","lifecycle_stage":"eol_hot","Rated output [kW]":"4 = 0.4","Estimated Lead Time":"Usually ships in 1 - 10 working days.","Electromagnetic brake":"None = Without"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$392.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c0afd59b737ed4daa93a5a9a95953d10.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Who supplies HC-KFS43K and how is it quoted for volume purchases?","answer":"Independent distribution handles this code under a quoted-to-order model — the RFQ carries the quantity, condition envelope (new-surplus vs pulled), and any traceability ask, and the lead-time window of 1 to 10 working days is confirmed against actual channel availability at quote time. Volume breaks move with lot size and condition grade, not a fixed ladder."},{"question":"What is HC-KFS43K's listed shaft type?","answer":"The shaft is the K-configuration with keyway — a straight shaft with a milled key slot, the standard for keyed coupling to a gear or pinion. Coupling selection must match the K-slot dimensions, not a generic round-bore or tapered-bore coupling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/mitsubishi/HC-KFS43K","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/mitsubishi/HC-KFS43K when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}