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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 |
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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 |
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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 |
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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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