1. Product Overview The 6305‑2RS1/C3 single row deep groove ball bearing is equipped with double-sided 2RS1 contact NBR rubber seals and C3 increased radial clearance. The expanded internal clearance offsets thermal expansion during continuous high-speed and high-temperature operation to avoid bearing seizure. Double contact rubber seals effectively block dust, water mist and impurities while locking internal grease, widely applied to high-speed medium-sized motors, water