The vibration and noise of bearings are classified in four classes Z1,Z2,Z3,andZ4.It is measured by the instrument of S0910-1.For special requirement,it is measured by BVT-1 and classified as V1,V2,and V3. The data are shown in below tables,different vibration & noise requirement should be mentioned in order. TOLERANCE DATE FOR VIBRATION OF SINGLE BEARING                  Tolerance μm/s d         V          V1          V2          V3 Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand Low Brand Medium Brand High Brand mm 5 110 72 60 90 60 50 58 36 30 35 21 18 6 110 72 60 90 60 50 58 36 30 35 21 18 7 130 96 80 110 80 65 72 48 40 44 28 24 8 130 96 80 110 80 65 72 48 40 44 28 24 9 130 96 80 110 80 65 72 48 40 44 28 24 10 160 120 100 140 100 85 90 60 50 55 35 30 12 160 120 100 140 100 85 90 60 50 55 35 30 15 210 150 120 180 130 100 110 78 60 65 46 35 17 210 150 120 180 130 100 110 78 60 65 46 35 20 260 190 150 220 160 125 130 100 75 80 60 45 22 260 190 150 220 160 125 130 100 75 80 60 45 25 260 190 150 220 160 125 130 100 75 80 60 45 28 260 190 150 220 160 125 130 100 75 80 60 45 30 300 240 190 250 200 160 150 120 100 90 75 60 32 300 240 190 250 200 160 150 120 100 90 75 60 35 300 240 190 250 200 160 150 120 100 90 75 60 40 360 300 260 300 250 220 180 150 130 110 90 80 MAXIMUM VIBRATION ACCCELERATION OF SINGLE BEARING            Tolerance in dB d Diameter Series(O)      Diameter Series(O) 　 mm Z Z1 Z2 Z3 Z Z1 Z2 ZZ3 Z4 Z Z1 Z2 Z3 Z4 3 35 34 32 28 36 35 32 30 - 37 36 33 31 - 4 35 34 32 28 36 35 32 30 - 37 36 33 31 - 5 37 36 34 30 38 37 34 32 - 39 37 35 33 - 6 37 36 34 30 38 37 34 32 - 39 37 35 33 - 7 39 38 35 31 40 38 36 34 - - - - - - 8 39 38 35 31 40 38 36 34 - - - - - - 9 41 40 36 32 42 40 37 35 - - - - - - 10 43 42 38 33 44 42 39 35 30 46 44 40 37 32 12 44 43 39 34 45 43 39 35 30 47 55 40 37 32 15 45 44 40 35 46 44 41 36 31 48 46 42 38 33 17 46 44 40 35 47 45 41 36 31 49 47 42 38 33 20 47 45 41 36 48 46 42 38 33 50 48 43 39 34 25 48 46