deep groove ball bearing size:6000,6100,6200 6300,6400series material:bearing steel,GCR15 hardness:59-63HRC 16001 2rs low noise deep groove ball bearing detail description:1) Types: 60 ... iron. 4) Shield / Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5) Vibration and Noisy level: Z1, Z2, Z3 ... every customer to establish friendly relations of cooperation. 16001 2rs low noise deep groove ball bearing