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Manufacturer functional interchange
Superior Gearbox BMQ040 appears in the same manufacturer-published cross-reference row as Sterling 2000RA 2133BQ at Match installed ratio/application · VarioDrive size 040.
Superior Gearbox publishes BMQ040 (VarioDrive size 040, motor input flange) as a competitor cross-reference target. Superior describes VarioDrive as functionally interchangeable with listed drives while requiring independent verification of ratings, dimensions, fit and application suitability.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
Sterling 2000RA 2133BQ and Superior Gearbox BMQ040 are tied by the published source at Match installed ratio/application · VarioDrive size 040.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.