BS ISO 3290-2 specifies requirements for finished silicon nitride balls for rolling bearings.
Contents of BS ISO 3290-2
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Requirements
5.1 Ball size
5.2 Quality of geometry and surface
5.3 Sorting accuracy and ball gauges
6 Material
7 Dimensions and tolerances
Annex A (normative) Method for assessment of deviation from spherical form
Annex B (normative) Illustration of ball gauges and sorting principles
Annex C (informative) Examples of defect types and methods of inspection
Bibliography