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◎ Vibration and Noise According to its accuracy Grade of the vibration value of the Noise of Bearing(Vibration), it is to be divided in Z1,Z2,Z3,Z4 four groups. It can also be in accordance with Speed Grade of Vibration Value (μm/s) V1,V2,V3,V4 Groups to measure its vibration. If users have no requirements on vibration, the Normal Grade Bearing usually to be in Vibration Value of Z1 Group. Bearing Vibration speed Grade can not be over the following   JB/T 7047-1999 Bore Diameter (mm) Diameter Series(0) Diameter Series(2) Diameter Series(3) Z1 Z2 Z3 Z1 Z2 Z3 Z4 Z1 Z2 Z3 Z4 4 34 32 28 35 32 30 -- 36 33 31 -- 5 36 34 30 37 34 32 -- 37 35 33 -- 6 36 34 30 37 34 32 -- 37 35 33 -- 7 38 35 31 38 36 34 -- -- -- -- -- 8 38 35 31 38 36 34 -- -- -- -- -- 9 40 36 32 40 37 35 -- -- -- -- -- 10 42 38 33 42 39 35 30 44 40 37 32 12 43 39 34 43 39 35 30 45 40 37 32 15 44 40 35 44 41 36 31 46 42 38 33 17 44 40 35 45 41 36 31 47 42 38 33 20 45 41 36 46 42 38 33 48 43 39 34 25 46 42 38 47 43 40 36 49 44 41 37 30 47 43 39 48 44 41 37 50 45 42 38 35 49 45 41 50 46 43 39 52 47 44 40 40 51 46 42 52 47 44 40 54 49 45 41 Single Bearing Vibration Speed Grade Allowed The Limit Value (μm/s) JB/T 10187-2000 Bore Diameter d(mm) V1 V2 V3 V4 Low Medium High Low Medium High Low Medium High Low Medium High 5 74 48 40 58 36 30 35 21 18 32 11 11 6 74 48 40 58 36 30 35 21 18 32 11 11 7 92 66 54 72 48 40 44 28 24 38 12 12 8 92 66 54 72 48 40 44 28 24 38 12 12 9 92 66 54 72 48 40 44 28 24 38 12 12 10 120 80 70 90 60 50 55 35 30 45 14 15 12 120 80 70 90 60 50 55 35 30 45 14 15 15 150 100 85 110 78 60 65 46 35 52 18 18 17 150 100 85 110 78 60 65 46 35 52 25 25 20 180 125 100 130 100 75 80 60 45 60 25 25 25 180 125 100 130 100 75 80 60 45 60 30 32 30 200 150 130 150 120 100 90 75 60 70 35 40 35 200 150 130 150 120 100 90 75 60 70 42 45 40 240 180 160 180 150 130 110 90 80 82 50 50 Next Page>> More Technique Information:   ◎ Materials >> ◎ Clearance >> ◎ Accuracy >> ◎ The Grease Types and Function >> ◎ Vibration and Noise >>

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