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Typical clearance groups for UGT deep groove ball bearings are C2, CN, C3, C4, and C5. Internal clearance is determined so that appropriate clearance will remain after the bearing is mounted to the shaft with an interference fit, but with no fit (no interference) between the outer Ring and housing and the temperature difference between inner and outer ring is 10 or less.

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INTERNAL CLEARANCE

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UGT Bearings

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C2:   less than Normal clearance
C3:   more than Normal clearance
C4:   more than C3
C5:   more than C4
CM : clearance for EMQ Bearing
MC:  clearance for Miniature bearing

Data of standard radial clearances for under no load
Bore C2 Normal C3 C4 C5
Over Including
mm lnch mm lnch min. max. min. max. min. max. min. max. min. max.
2.5 0.0984 10 0.394 0 7 2 13 8 23 14 29 20 37
10 0.3937 18 0.709 0 9 3 18 11 25 18 33 25 45
18 0.7887 24 0.945 0 10 5 20 13 28 20 36 28 48
24 0.9449 30 1.181 1 11 5 20 13 28 23 41 30 53
30 1.1811 40 1.575 1 11 6 20 15 33 28 46 40 64
40 1.5748 50 1.969 1 11 6 23 18 36 30 51 45 73
50 1.9685 65 2.559 1 15 8 28 23 43 38 61 55 90

The radial clearances of bearings with electric motor quality
Bore CM
Over Including Min. Max.
mm lnch mm lnch um um
10 0.9397 18 0.7087 4 11
18 0.7087 24 0.9449 5 12
24 0.9449 30 1.1811 5 12
30 1.1811 40 1.5748 9 17
40 1.5748 50 1.9685 9 17
50 1.9685 65 2.5591 12 22

Data of the mini-deep groove ball bearing under no load
Clearance code MC1 MC2 MC3 MC4 MC5 MC6
Clearance min. max. min. max. min. max. min. max. min. max. min. max.
0 5 3 8 5 10 8 13 14 21 21 29

Tolerance in um.

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