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Manufacturer dimensional interchange
Falk / Rexnord 09UCBN2 appears in the same manufacturer-published cross-reference row as Flender/Motox D101 at Verify motor speed and installed ratio · Ultramite size 09.
Falk/Rexnord Form 950-501 publishes 09UCBN2 in its base-mounted helical dimensional comparison for size 09. 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.
The manufacturer publishes the two models in a dimensional-interchange table or equivalent dimensional comparison.
Flender/Motox D101 and Falk / Rexnord 09UCBN2 are tied by the published source at Verify motor speed and installed ratio · Ultramite size 09.
Dimensional alignment does not by itself prove identical torque, thermal rating, service factor, ratio, accessories, or application suitability.