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Manufacturer functional interchange
Superior Gearbox BMQ063 appears in the same manufacturer-published cross-reference row as Baldor 258 at Match installed ratio/application · VarioDrive size 063.
Superior Gearbox publishes BMQ063 (VarioDrive size 063, 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.
Baldor 258 and Superior Gearbox BMQ063 are tied by the published source at Match installed ratio/application · VarioDrive size 063.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.