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Technical Date
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Internal clearance is determined so that appropriate clearance will remain after the bearing is mounted to the shaft with an interference fit. Typical clearance groups for the deep groove ball bearings are C2, CN, C3, C4, and C5. CN(Normal)
C2: less than Normal clearance
C3: more than Normal clearance
C4: more than C3
C5: more than C4
CM: clearance for EMQ Bearings
MC: clearance for Miniature Bearings

Deep groove ball bearing radial clearance 

Nominal bearing inner diameter d(mm) Clearance
C2 CN C3 C4 C5
Exceed Below Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
10 0 7 2 13 8 23 14 29 20 37
(Be limited to)
10 18 0 9 3 18 11 25 18 33 25 45
18 24 0 10 20 5 13 25 20 36 25 48
24 30 1 11 5 20 13 28 23 41 30 53
30 40 1 11 6 20 15 33 28 46 40 64
40 50 1 11 6 23 18 36 30 51 45 73
50 65 1 15 8 28 23 43 38 61 55 60
65 80 1 15 10 30 25 51 46 71 65 105
80 100 1 18 12 36 30 58 53 84 75 120

Miniature Bearing’s Internal Radial Clearance

Clearance code MC1 MC2 MC3 MC4 MC5 MC6
Clearance max min max min max min max min max min max min
0 5 3 8 5 10 8 13 13 20 20 28

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