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SK12(3)F → F842BF/F843BF replacement

Manufacturer functional interchange

NORD DRIVESYSTEMS SK12(3)F replacement

Boston Gear F842BF/F843BF appears in the same manufacturer-published cross-reference row as NORD DRIVESYSTEMS SK12(3)F at Match installed ratio/application · Boston 800 size 840 · Output flange mounted NEMA C-face.

Published targetF842BF/F843BFBoston GearMatch installed ratio/application

Evidence publisherBoston GearEvidence typeFunctional interchangeReviewedSep 21, 2026Open source ↗

Replacement referenceDirectional lookup

Existing / searched modelNORD DRIVESYSTEMSSK12(3)FOpen source-model record →

Published target modelBoston GearF842BF/F843BF

What the source establishesFunctional interchange

Boston Gear publishes F842BF/F843BF for 800 Series size 840 in the output flange mounted nema c-face column of its in-line helical interchange guide. Boston states the 800 Series is designed to be functionally interchangeable with listed drives while requiring verification of ratings and dimensions.

Evidence meaning

The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.

NORD DRIVESYSTEMS SK12(3)F and Boston Gear F842BF/F843BF are tied by the published source at Match installed ratio/application · Boston 800 size 840 · Output flange mounted NEMA C-face.

Evidence boundary

The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.

Other models in the same published row7

David BrownM042(3)FANSame Match installed ratio/application published row →Dodge QuantisHB382(3)CNSame Match installed ratio/application published row →Falk04UCFN2(3)-ASame Match installed ratio/application published row →FlenderEF30/ZF30/DF30 (M, G or A)Same Match installed ratio/application published row →SEW-EURODRIVERF40LPSame Match installed ratio/application published row →STOBERC102/3F-MRSame Match installed ratio/application published row →SumitomoHF(C or M) 3100/05Same Match installed ratio/application published row →

Replacement verification checklistBefore purchase

RatioConfirm nominal and actual ratio against required output speed.

Shaft / boreMeasure the driven shaft and verify bushing or bore configuration.

InputCheck high-speed shaft, motor frame, sheave and input interface.

MountingCompare center height, footprint, torque-arm geometry and housing clearances.

AccessoriesDo not assume existing backstops, motor mounts, belt guards or screw-conveyor hardware transfer.

DutyRecheck torque, service factor, shock, starts per hour, temperature and lubrication.

Full published row Field checklist Source document ↗