... bearings(30000 series and non-standard series) 3)cylindrical roller bearing(NU,NJ,NUP series) 4)spherical roller bearings(21000, ... 50000 series) 8)spherical plain bearing (GE and GEG series)3.Brand:NSK,NTN,NACHI,KOYO4.material:bearing steel Gr15 AISL52100,DIN100CR65.accuracy ... class : P0,P6,P5,P4,P2 NSK/NTN/NACHI/KOYO 6302z ...