nsk self aligning ball bearing 1.Size:12,22,13,23,14series,etc. 2.reference price:US$0.55-100.00 3.mini order:10sets nsk self aligning ball bearing1.Types:60series,12series,22series,,13series,23series,etc.2.Material:Gcr15-China,(AISI)52100-USA,(DIN)100CR6-Germany3.Sealing cover:Z,ZZ,RS,2RS,RZ,ZNR,etc.4.Vibration and Noisy level:Z1,Z2,Z3,ZV1.ZV2.ZV3,5.Precision level:ABEC-1,ABEC-3,ABEC-56.Main ...