1. Product Overview The 6304‑2RSH/C3 single row deep groove ball bearing is fitted with double-sided low-friction 2RSH contact rubber seals and C3 enlarged radial clearance. The expanded internal clearance offsets thermal expansion during long-time high-speed and high-temperature operation to avoid bearing seizure. Double contact rubber seals effectively block dust, water mist and fine impurities while locking internal grease, widely applied in high-speed small motors, power