Boston Gear 231D-14 is a 200 Series Optimount parallel-shaft helical gear reducer with a 14:1 reduction ratio and a hollow output shaft. It uses a solid input shaft and is offered without a base, configured for basic mounting. The input shaft diameter is 0.9375 in, and the hollow output shaft diameter is 1.3750 in, enabling straightforward shaft‑coupled connections. This 231 reducer is part of Boston Gear's Optimount family, known for compact, parallel‑shaft, hollow‑output designs within the 200 Series lineup. Distributor listings and the Boston Gear catalog confirm the 231D-14 as a hollow‑output, 14:1 ratio reducer without base in the 200 Series lineup.
