KNOWLEDGE

Bearing Knowledge

Bearing Knowledge

Bearing knowledge include bearing inner diamater calculation, bearing precision and internal clearance.

Bearing Inner Diameter:

ID(mm)ID Code(mm)For Example
1006201 Bearing, 01 stands for bearing ID is 12mm
121
152
173
20~480Bearing ID= ID Code*56205 Bearing , 05 standars for bearing ID is 25mm

Bearing Knowledge- Bearing Precision:

Bearing precision, in other words dimensional accuracy and rotation accuracy, has corresponding international standards and national standards.
National standards for different countries are consistent with international standard.

CountryStandardPrecision
ChinaGB/T307.1P0P6P5P4P2
USAANSI/AFBMA Std.20ABEC-1ABEC-3ABEC-5ABEC-7ABEC-9
JapanJIS B 151406542
GermanyDIN 620P0P6P5P4P2
InternationalISO 492Class 0Class 6Class5Class4Class2

Internal Clearance:

Internal bearing clearance refers to the amount of radial or axial displacement when either the inner ring or the outer ring is fixed, and the unfixed one is moved. Depending on the direction of movement, it can be divided into radial clearance and axial clearance.
Generally we control the radial clearance for deep groove ball bearings , while we control axial clearance for double row angular contact ball bearings.

For deep groove ball bearings, radial clearance is as below,

Bearing ID(mm)C2C0C3C4C5
minmaxminmaxminmaxminmaxminmax
2.5100721382314292037
101809318112518332545
1824010520132820362848
2430111520132823413053
3040111620153328464064
4050111623183630514573
5065115828234338615590
658011510302551467165105
8010011812363058538475120

For double row angular contact ball bearings, axial clearance is as below,

Bearing ID (mm)C2C0C3
  >   minmax   minmax   minmax
101115211228
10181126231331
18242147251624
24302158271837
30402168292140
405021811332344
506532213362648
658032415403054
8010032618463563

If you have any questions or suggestion about the bearing knowledge that we shared, just leave a comment and we will give you reply within 12 hours !