Clearance

Internal clearance can also be expressed as radial play or axial play and is the amount of space between the inner and outer ring raceways and the balls.

"Radial clearance is the clearance measured perpendicular to the bearing axis or more specifically: average outer ring raceway diameter minus average inner ring raceway diameter minus (2 x ball diameter).


Axial clearance is the clearance measured along the bearing axis is known as axial play. "


Radial clearance (or internal radial play) is an important consideration when choosing a bearing. The radial clearance in the bearing before it is fitted can be called the "initial" radial clearnace. "Residual" or "operational" radial clearance is what is left when the bearing has been fitted.There should normally be a slight residual radial clearance in the bearing to minimize ball skidding and reduce axial clearance (end play). Correct selection of the initial radial clearance can avoid faster bearing wear and reduce unwanted play.

Deep groove ball bearing clearance (um)(for ceramic and SS bearing)

Bore diameter
d (mm)
C2 C0 C3 C4 C5
over to Min Max Min Max Min Max Min Max Min Max
2.5 6 1 8 5 15 10 20 15 25 21 33
6 10 2 9 6 17 12 25 19 33 27 42
10 14 2 10 6 19 13 26 21 35 30 48
14 18 3 12 8 21 15 28 23 37 32 50
18 24 4 14 10 23 17 30 25 39 34 52
24 30 5 16 11 24 19 35 29 46 40 58
30 40 6 18 13 29 23 40 34 53 46 66
40 50 6 19 14 31 25 44 37 57 50 71
50 65 7 21 16 36 30 50 45 69 62 88
65 80 8 24 18 40 35 60 54 83 76 108
80 100 9 27 22 48 42 70 64 96 89 124
100 120 10 31 25 56 50 83 75 114 105 145
120 140 10 38 30 68 60 100 90 135 125 175
140 160 15 44 35 80 70 120 110 161 150 210

Self-aligning ball bearing clearance (um)(for ceramic and SS bearing)

Bore diameter
d (mm)
C2 C0 C3 C4 C5
over to Min Max Min Max Min Max Min Max Min Max
2.5 6 0 7 2 13 8 23 14 29 20 37
6 10 0 7 2 13 8 23 18 33 25 45
10 18 0 9 3 18 11 25
18 24 0 10 5 20 13 28 20 31 28 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 90
65 80 1 15 10 30 25 51 46 71 65 105
80 100 1 18 12 36 30 58 53 84 75 120
100 120 2 20 15 41 36 66 61 97 90 140
120 140 2 23 18 48 41 81 71 114 105 160