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Manufacturer functional interchange
Toledo Gear TQ21H appears in the same manufacturer-published cross-reference row as WorldWide Electric HDRF206-H at Match installed ratio · 2.06 in center distance.
Toledo Gear publishes TQ21H at 2.06 in center distance for c-face or shaft input / hollow bore output and lists the competitor models in the same TG-90 interchange row. Toledo describes TG-90 reducers as designed to be functionally interchangeable while requiring current rating and dimensional verification.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
WorldWide Electric HDRF206-H and Toledo Gear TQ21H are tied by the published source at Match installed ratio · 2.06 in center distance.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.