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Manufacturer dimensional interchange
Falk / Rexnord 08UCBN2 appears in the same manufacturer-published cross-reference row as Flender/Motox D81 at Verify motor speed and installed ratio · Ultramite size 08.
Falk/Rexnord Form 950-501 publishes 08UCBN2 in its base-mounted helical dimensional comparison for size 08. 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 D81 and Falk / Rexnord 08UCBN2 are tied by the published source at Verify motor speed and installed ratio · Ultramite size 08.
Dimensional alignment does not by itself prove identical torque, thermal rating, service factor, ratio, accessories, or application suitability.