NTN miniature ball bearings data

Dimensional and rotational accuracy

The accuracy of NTN miniature and extra small ball bearings complies with JIS standards. Accuracy standards are listed in the Bearings Tolerances. Flange accuracies are listed as follows.

Accuracy class Outer diameter dimensional tolerance Outer ring surface runout for rear surface
SD1
Max.
Back face axial runout
Sea1
Max.
Width dimension tolerance
ΔC1S or ΔC2S
Upper Lower
Width unevenness
VC1S or VC2S
Max.
ISO standard Class 0 see table below - - Identical to same bearing's inner ring VBS Identical to same bearing's inner ring VBS
Class 6 - -
Class 5 8 11 5
Class 4 4 7 2.5
Class 2 1.5 3(1)
4
1.5

(1) Nominal outer diameter, 18 mm or less.

Flange nominal
outer diameter
D1 or D2
mm
Outer diameter
dimensional tolerance
ΔD1S or ΔD2S
um
over incl. Upper Lower
- 10 +220 -36
10 18 +270 -43
18 30 +330 -52
30 50 +390 -62

Radial internal clearance

Radial internal clearance values should be applied as listed in the table regarding the Bearing Internal Clearance and Preload.

However, for NTN miniature and extra small bearings, the radial clearance values for high precision bearings given as below are applied in many cases.

MIL Standard Tight Standard Loose Extra Loose
Code C2S CNS CNM CNL C3S C3M C3L
Internal
clearance
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
0 5 3 8 5 10 8 13 10 15 13 20 20 28

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