1. Product Overview The 5203.KYY2 double‑row angular contact ball bearing is a heavy‑duty special bearing for agricultural planting equipment. Adopting KYY2 multi‑lip reinforced sealing structure, it effectively blocks soil, dust and moisture under harsh farm‑field operating conditions. Double‑row ball structure supports heavy combined radial and bidirectional axial loads, adapts to frequent impact and vibration from field work. It is widely used for seed drills, seeder gauge