1. Product Overview The W209PPB5 is heavy-duty agricultural square bore ball bearing with spherical outer ring and multi-layer composite mud-proof seals. Designed for 1-3/8 inch square drive shafts, it fits perfectly on disc harrows, round balers and combine harvesters. Spherical outer surface provides self-aligning function to compensate minor assembly misalignment. Non-relubricated sealed construction serves as reliable interchange replacement for farm tillage equipment. 👉