1. Product Overview The 6220-2Z/C3 is single row deep groove ball bearing fitted with double non-contact metal dust shields and C3 enlarged radial clearance. Double-sided ZZ metal shields block floating dust and seal internal grease inside the bearing, ideal for dry, dusty industrial operating environments. C3 extra internal clearance reserves expansion space to eliminate thermal expansion jamming under continuous high-speed and high-temperature running conditions. It