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M042(3)FRN → 842BF/843BF replacement

Manufacturer functional interchange

David Brown M042(3)FRN replacement

Boston Gear 842BF/843BF appears in the same manufacturer-published cross-reference row as David Brown M042(3)FRN at Match installed ratio/application · Boston 800 size 840 · Output flange mounted.

Published target842BF/843BFBoston GearMatch installed ratio/application

Evidence publisherBoston GearEvidence typeFunctional interchangeReviewedSep 21, 2026Open source ↗

Replacement referenceDirectional lookup

Existing / searched modelDavid BrownM042(3)FRNOpen source-model record →

Published target modelBoston Gear842BF/843BF

What the source establishesFunctional interchange

Boston Gear publishes 842BF/843BF for 800 Series size 840 in the output flange mounted 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.

David Brown M042(3)FRN and Boston Gear 842BF/843BF are tied by the published source at Match installed ratio/application · Boston 800 size 840 · Output flange mounted.

Evidence boundary

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

Other models in the same published row6

Falk04UCFN2(3)-NSame Match installed ratio/application published row →FlenderEF30/ZF30/DF30Same Match installed ratio/application published row →NORD DRIVESYSTEMSSK12(3)F-WSame Match installed ratio/application published row →SEW-EURODRIVERF40Same Match installed ratio/application published row →STOBERC102/3F-AWSame Match installed ratio/application published row →SumitomoHF3100/05Same 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 ↗