Measurement methods
The general principles for verifying the dimensions and runout of rolling ball bearings are specified
in JIS B 1515-2.
The overview of the method of measuring the actual dimensions and runout is shown below.
Dimensions related
- 1. Actual bore diameter (ds) Fig. 8-1
- 2. Actual outer diameter (Ds) Fig. 8-2
- 3. Actual inner ring width (Bs) Fig. 8-3
- 4. Actual outer ring width (Cs) Fig. 8-4
Measure at different angles in the radial plane.
Bore diameter (ds)
Fig. 8-1
Measure at different angles in the radial plane.
Outer diameter (Ds)
Fig. 8-2
Turn the inner ring once and measure.
Inner ring width (Bs)
Fig. 8-3
Turn the outer ring once and measure.
Outer ring width (Cs)
Fig. 8-4
Runout related
- 1. Perpendicularity of inner ring side surface with respect to the inner diameter axis (
- 2. Perpendicularity of outer ring outer diameter surface with respect to the side surface (
- 3. Radial runout of inner ring (Kia) Fig. 8-7
- 4. Radial runout of outer ring (Kea) Fig. 8-8
- 5. Axial runout of inner ring (Sia) Fig. 8-9
- 6. Axial runout of outer ring (Sea) Fig. 8-10
Remark: [ ] is the expression in previous JIS.
Read the indicator while rotating the inner ring once.
Perpendicularity of the inner ring side (Sd)
Fig. 8-5
Read the indicator while rotating the outer ring once.
Perpendicularity of the outer ring outer diameter surface (SD)
Fig. 8-6
Apply a load to the inner ring and read the indicator while rotating once.
Radial runout of inner ring (Kia)
Fig. 8-7
Apply a load to the outer ring and read the indicator while rotating once.
Radial runout of outer ring (Kea)
Fig. 8-8
Apply a load to the inner ring and read the indicator while rotating once.
Axial runout of inner ring (Sia)
Fig. 8-9
Apply a load to the outer ring and read the indicator while rotating once.
Axial runout of outer ring (Sea)
Fig. 8-10
Related page
Engineering Information for Miniature & small ball bearings
Selecting the Right Part
Technical Data
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