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National Precision Bearing

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Ball Bearing Radial Internal Clearance

  • C/1 - Internal Clearance is smaller than C/2.
  • C/2 - Internal Clearance is smaller than STANDARD.
  • STANDARD - No clearance marking is indicated on the bearing or packaging.
  • C/3 - Internal Clearance larger than STANDARD.
  • C/4 - Internal Clearance larger than C/3.
  • C/5 - Internal Clearance larger than C/4.
RADIAL INTERNAL CLEARANCE OPTIONS
Bore Diameter
d (Metric)
Radial Internal Clearance (Inch)
C/2StandardC/3C/4C/5
OverIncl.minmaxminmaxminmaxminmaxminmax
2.56.0000.0003.0001.0005.0003.0009.0005.0012.0008.0014
610.0000.0003.0001.0005.0003.0009.0005.0012.0009.0018
1018.0000.00035.0001.0007.0004.0010.0007.0013.0010.0019
1824.0000.0004.0002.0008.0005.0011.0008.0014.0011.0018
2430.00005.00045.0002.0008.0005.0011.0009.0016.0012.0021
3040.00005.00045.0002.0009.0006.0013.0011.0018.0015.0025
4050.00005.00045.0002.0009.0007.0014.0012.0020.0017.0029
5065.00005.0006.0003.0011.0009.0017.0015.0024.0021.0035
6580.00005.0006.0004.0012.0010.0020.0018.0028.0025.0041
80100.00005.0007.0005.0014.0012.0023.0021.0033.0030.0047
Ball Bearing Clearance
Sales Offices

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