Deep groove ball bearings mainly take radial load as well as take moderate axial load. With less coefficient of friction, high limiting speed, large size range and variety of structure. Deep groove ball bearings are the most widely used roller bearings. Bearings with inner diameter from 15 to 45mm are usually suitable for motors, motorcycles, vehicles, tractors and electric tools while open bearings with P6-P5 grade precision specially for the drive partts such as transmissions, crankshafts, steering axles, clutches and rear-front axles off vehicles, motorcycles and tractors. Different bearing series, sealing method, clearance and grease can be selected according to special situations and requirements.