Internal Clearances determine the optimal speed and load for each bearing

Bore Diameter (mm) C2 Clearance min - max (µm) C0 Clearance min - max (µm) C3 Clearance min - max (µm) C4 Clearance min - max (µm) C6 Clearance min - max (µm)
2.5 to 6    0 - 7  2 - 13  8 - 23 - -
 6 to 10 0 - 7  2 - 13  8 - 23 14 - 29 20 - 37
10 to 18 0 - 9  3 - 18 11 - 25 18 - 33 25 - 45
18 to 24  0 - 10  5 - 20 13 - 28 20 - 36 28 - 48
24 to 30  1 - 11  5 - 20 13 - 28 23 - 41 30 - 53
30 to 40  1 - 11  6 - 20 15 - 33 28 - 46 40 - 64
40 to 50  1 - 11  6 - 23 18 - 36 30 - 51 45 - 73
50 to 65  1 - 15  8 - 28 23 - 43 38 - 61 55 - 90
65 to 80  1 - 15 10 - 30 25 - 51 46 - 71  65 - 105
 80 to 100  1 - 18 12 - 36 30 - 58 53 - 84  75 - 120
100 to 120  2 - 20 15 - 41 36 - 66 61 - 97  90 - 140
120 to 140  2 - 23 18 - 48 41 - 81 71 - 114 105 - 160
140 to 160  2 - 23 18 - 53 46 - 91  81 - 130 -
160 to 180  2 - 25 20 - 61  53 - 102  91 - 147 -
180 to 200  2 - 30 25 - 71  63 - 117  107 - 163 -
200 to 225 2 - 35 25 - 85 75 - 140 125 - 195 -
225 to 250 2 - 40 30 - 95 85 - 160 145 - 225 -
250 to 280 2 - 45 35 - 105 90 - 170 155 - 245 -
280 to 315 2 - 55 40 - 115 100 - 190 175 - 270 -
315 to 355 3 - 60 45 - 125 110 - 210 195 - 300 -
355 to 400 3 - 70 55 - 145 130 - 240 225 - 340 -
400 to 450 3 - 80 60 - 170 150 - 270 250 - 380 -
450 to 500 3 - 90 70 - 190 170 - 300 280 - 420 -