1. Product Overview The W210PP4 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, widely installed on disc harrows, rotary tillers and balers. Spherical outer surface delivers self-aligning capability to offset minor assembly misalignment. Sealed maintenance-free structure, interchangeable with many mainstream agricultural OEM replacement parts. 👉 Get a quote