ball and roller bearings - NTN Bearing Corporation of America

Standard tolerance values for radial internal clearance of single row
deep groove ball bearings with cylindrical bore.
SINGLE ROW DEEP GROOVE BALL BEARINGS (CYLINDRICAL BORE)
CLEARANCE
TABLES
Nominal Bore C2 –– C3 C4
d Less than Greater than Greater than
mm Normal Clearance Normal Clearance Normal Clearance C3 Clearance
Over Incl. Low High Low High Low High Low High
— 2.5 — 6 4 11 10 20 — —
2.5 10.0 — 7 2 13 8 23 — —
10.0 18.0 — 9 3 18 11 25 18 33
18.0 24.0 — 10 5 20 13 28 20 36
24.0 30.0 — 11 5 20 13 28 23 41
30.0 40.0 — 11 6 20 15 33 28 46
40.0 50.0 — 11 6 23 18 36 30 51
50.0 65.0 — 15 8 28 23 43 38 61
65.0 80.0 — 15 10 30 25 51 46 71
80.0 100.0 — 18 12 36 30 58 53 84
100.0 120.0 — 20 15 41 36 66 61 97
120.0 140.0 — 23 18 48 41 81 71 114
140.0 160.0 — 23 18 53 46 91 81 130
160.0 180.0 — 25 20 61 53 102 91 147
180.0 200.0 — 30 25 71 63 117 107 163
Table 18-A (Clearance Limits in 0.0001 inch)
SINGLE ROW DEEP GROOVE BALL BEARINGS (CYLINDRICAL BORE)
Nominal Bore C2 –– C3 C4
d Less than Normal Clearance Greater than Normal Greater than
inch Clearance Normal Clearance Clearance C3 Clearance
Over Incl. Low High Low High Low High Low High
— .0984 — 2.4 1.6 4.3 3.9 7.9 — —
.0984 .3937 — 2.8 .8 5.1 3.1 9.1 — —
.3937 .7087 — 3.5 1.2 7.1 4.3 9.8 7.1 13.0
.7087 .9449 — 3.9 2.0 7.9 5.1 11.0 7.9 14.2
.9449 1.1811 — 4.3 2.0 7.9 5.1 11.0 9.1 16.1
1.1811 1.5748 — 4.3 2.4 7.9 5.9 13.0 11.0 18.1
1.5748 1.9685 — 4.3 2.4 9.1 7.1 14.2 11.8 20.1
1.9685 2.5591 — 5.9 3.1 11.0 9.1 16.9 15.0 24.0
2.5591 3.1496 — 5.9 3.9 11.8 9.8 20.1 18.1 28.0
3.1496 3.9370 — 7.1 4.7 14.2 11.8 22.8 20.9 33.1
3.9370 4.7244 — 7.9 5.9 16.1 14.2 26.0 24.0 38.2
4.7244 5.5118 — 9.1 7.1 18.9 16.1 31.9 28.0 44.9
5.5118 6.2993 — 9.1 7.1 20.9 18.1 35.8 31.9 51.2
6.2992 7.0866 — 9.8 7.9 24.0 20.9 40.2 35.8 57.9
7.0866 7.8740 — 11.8 9.8 28.0 24.8 46.1 42.1 64.2
Nominal Bore Measuring Clearance
Over
d
mm
Incl.
Load
(kg) C2 Normal C3 C4
10 18 2.5 3~4 4 4 4
18 50 5 4~5 5 6 6
Table 18 (Clearance Limits in 0.001 mm)
RADIAL CLEARANCE COMPENSATION VALUES
Table 19 (Clearance Limits in 0.001 mm)
Table 19-A (Clearance Limits in 0.0001 inch)
Nominal Bore Measuring Clearance
Over
d
inch
Incl.
Load
(lbs) C2 Normal C3 C4
.3937 .7087 5.5 1.2~1.6 1.6 1.6 1.6
.7087 1.9685 11 1.6~2.0 2.0 2.4 2.4
REMARKS:
When measuring radial internal clearance, a slight amount of elastic deformation of the bearing occurs. The resulting measured clearance is slightly larger than
the true clearance, and must be accounted for. These compensation values are given in tables 19 and 19-A.
265