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Explicit manufacturer interchange
Sterling Electric 175/2175BQ appears in the same manufacturer-published cross-reference row as Leeson Ironman BMQ818 at Match installed ratio · 1.75 in center distance.
Sterling Electric explicitly marks the listed competitor models "Yes" for interchange with 175/2175BQ at 1.75 in center distance in its 2000RA Style BQ Interchange Guide. Rows marked No are intentionally excluded.
The manufacturer explicitly marks the compared model as an interchange in its published table.
Leeson Ironman BMQ818 and Sterling Electric 175/2175BQ are tied by the published source at Match installed ratio · 1.75 in center distance.
Still verify the exact configured ratio, input/output interfaces, duty, accessories, and installation conditions.