N21 → 04UCBN2 replacement

Replacement referenceDirectional lookup

Existing / searched modelLeroy Somer NXTN21Open source-model record →

Published target modelFalk / Rexnord04UCBN2Open target specs →

What the source establishesDimensional interchange

Falk/Rexnord Form 950-501 publishes 04UCBN2 in its base-mounted helical dimensional comparison for size 04. The guide states that several competitive helical designs are drop-in replacements but instructs users to verify motor speed, gear ratio, output RPM, mounting position and current catalog ratings. Availability of this historical configuration should also be confirmed.

Evidence meaning

The manufacturer publishes the two models in a dimensional-interchange table or equivalent dimensional comparison.

Leroy Somer NXT N21 and Falk / Rexnord 04UCBN2 are tied by the published source at Verify motor speed and installed ratio · Ultramite size 04.

Evidence boundary

Dimensional alignment does not by itself prove identical torque, thermal rating, service factor, ratio, accessories, or application suitability.

Published target specifications3 model-level fields

Falk / Rexnord04UCBN2Ultramite UC

Full model record →

Representative output torque at closest 25:1 / 1750 rpm: 1420 lb-inSource ↗
Interchange basis: Falk Ultramite 950-501 dimensional comparisonSource ↗
Ultramite size: 04Source ↗

Other models in the same published row13

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.

Leroy Somer NXT N21 replacement