The size of bearing clearance directly related to the use of noise, vibration, normal temperature, service life and the assembly of machinery motion effect.Therefore, it is very important that we choose the suitable assembly bearing clearance. We divided from small to big according to radial clearance range into C2、CO、C3、C4 and C5. Specific reference see the chart:

 Bore

 

 C2

 

 C0  C3  C4  C5
 Over  Inchuding
 mm  Inch  mm  Inch  min.  max.  min.  max.  min.  max .  min.  max.  min.  max.
2.5 0.0984 10 0.3937 0 7 2 13 8 23 14 29 20 37
10 0.3937 18 0.7087 0 9 3 18 11 25 18 33 25 45
18 0.7887 24 0.9449 0 10 5 20 13 28 20 36 28 48
24 0.9449 30 1.1811 1 11 5 20 13 28 23 41 30 53
30 1.1811 40 1.5748 1 11 6 20 15 33 28 46 40 64
40 1.5748 50 1.9685 1 11 6 23 18 36 30 51 45 73
50 1.9685 65 2.5591 1 15 8 28 23 43 38 61 55 90

 

  Also can consult the table below choose bearing clearance

 

 

 The usage situation  Use examples  Choose clearance
Strict control noise, vibration Installation precsion, high petition Instrument and equipmentRoll neck calender Low noise and small motor C2, CO
General toad,speed,working temperature is not high. Transmission machinery, reducer and other
general machinery
CO
High temperature,high speed,high requirements for service life Automobile generator and engine C3
Using high temperature environment,should not be the occasion of heat Drying machine,paper making machinery,and so on. C3 ' C4
High temperature,high speed,and large impact load Vibrating screen, speed gear C4
Inner and outer ring take the surplus interference, large voltime, high  temperature, heat dissipation Vibration type pressure road,machine car rear wheel C5

 

In actual use, we adjust the selection of bearing clearance according to the corresponding situation.The ideal work clearance should be close to zero clearance, so bearing load distribution is in the best condition, having the longest life.