Bearing Precision & Radial Clearance   | TOLERANCE | VIBRATION | LUBRICANTS | MATERIALS |   Bearing precision Grades Standards Precision Grade China standard GB G E D C B international standard lSO Normal Class Class 6 Class 5 Class 4 Class 2 American standard ANSl ABEC 1 ABEC 3 ABEC 5 ABEC 7 ABEC 9 Germany Standard DlN P0 P6 P5 P4 P2 Japan Standard Jls Class0 Class 6 Class 5 Class 4 Class 2 Deep Groove Bearing Radial Clearance Nominal Bore Over 2.5 6 10 18 24 30 40 50 65 80 100 120 140 160 d=mm to 6 10 18 24 30 40 50 65 80 100 120 140 160 180 Group min 0 0 0 0 1 1 1 1 1 1 2 2 2 2 C2 max 7 7 9 10 11 11 11 15 15 18 20 23 23 25 Normal Group min 2 2 3 5 5 6 6 8 10 12 15 18 18 20 CN max 13 13 18 20 20 20 23 28 30 36 41 48 53 61 Group min 8 8 11 13 13 15 18 23 25 30 36 41 46 53 C3 max 23 23 25 28 28 33 36 43 51 58 66 81 91 102 Group min   14 18 20 23 28 30 38 46 53 61 71 81 91 C4 max   29 33 36 41 46 51 61 71 84 97 114 130 147 Chemical composition of bearing steel Gcr15 Element(wt%) C 0.95-1.05 Cr 1.40-1.65 Si 0.15-0.35 Mn 0.25-0.45 P≤ 0.027 S ≤ 0.02 Element(wt%) Ni ＜0.23 Cu ≤0.25 Mo ≤0.1 Sn ＜0.03 As ＜0.04 Ti ＜0.005 Element(wt%) Sb ＜0.002 Pb ＜0.002 O ＜0.001 Al ＜0.05 Ca ＜0.01   Corresponding essignation equivalent GCr15 CHINA lSO USA GERMANY JAPAN SWEDEN GCr15 683/xvII 52100(ASTM 100Cr6(DlN SUJ2(JlS) SKF3 Stainless steel Steel Number AlSl-440C Chemical  composition% C Si Mn P S Cr Mo 0.95-1.2 ＜1.0 ＜1.0 ＜0.04 ＜0.03 16-18 ＜0.75

2002 Superoll. © All Rights Reserved.