Code Description C2 Radial clearance lower than CN CN Normal radial clearance C3 Radial clearance higher than CN C4 Radial clearance higher than C3

Rear wheel bearingsnoise

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Rear wheel bearingssymptoms

Bore size (mm) Radial bearing clearance (microns) d C2 CN C3 C4 More than Up to Min. Max. Min. Max. Min. Max. Min. Max. - 24 24 30 0 0 25 25 20 20 45 45 35 35 60 60 50 50 75 75 30 40 50 40 50 65 5 5 10 30 35 40 25 30 40 50 60 70 45 50 60 70 80 90 60 70 80 85 100 110 65 80 100 80 100 120 10 15 15 45 50 55 40 50 50 75 85 90 65 75 85 100 110 125 90 105 125 125 140 165 120 140 160 140 160 180 15 20 25 60 70 75 60 70 75 105 120 125 100 115 120 145 165 170 145 165 170 190 215 220 180 200 225 200 225 250 35 45 45 90 105 110 90 105 110 145 165 175 140 160 170 195 220 235 195 220 235 250 280 300 250 280 315 280 315 355 55 55 65 125 130 145 125 130 145 195 205 225 190 200 225 260 275 305 260 275 305 330 350 385 355 400 450 400 450 500 100 110 110 190 210 220 190 210 220 280 310 330 280 310 330 370 410 440 370 410 440 460 510 550

So what do these tolerances mean in terms of physical movement? Depending on the the bearings size, the actual clearance values can be read from the following table (values in microns).

Radial clearance is the movement of the inner ring in relation to the outer ring. This movement can be effected by shaft and housing fitting tolernaces and working temperature. Selecting the correct radial clearance will depend up your fitting requirements and temperatures. Many roller and ball bearing types can be purchased with the following clearance specifications. These specifications are virtually universal across all bearing manufacturers although some manufacturers such as NSK go further and provide subgroup tolernace bands that fit between the four basic clearance types.