... :2008 5.Delivery in time Manufacture of most professional self-aligning ball bearing also supply taper roller bearing,spherical roller bearing,cylindrical roller bearing,thrust bearing ... ) Shield / Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5) Vibration and Noisy level: Z1, Z2, Z3, ZV1, ZV2.ZV3 ... friendly relations of cooperation Own factroy produce Self-aligning ball bearing for low nosie motor