Requirements for balls used in ball bearings and for general industrial applications

The following standards must be observed

Below you find the latest requirements for balls made of thorough-hardened ball bearing steel according to American standards. We have brought the specifications up-to-date; however, all documents and tables are in English. You may easily download the PDF files by clicking on them or read them online.

1. Overview:

• American Standards in English

2. Appendix:

• I. Error of Measurement of the Spherical Shape
  
• II.1 Recommended Method Pertaining to Micro Hardness, Testing of Small Balls
  
• II.2 Recommended Method for Measuring the Fullness of the Container for Carburized and Hardened Carbon Steel Balls
• II.2.1 Minutes of Measurements (Paper)
• II.2.2 Graphic Display of Sample mm
• II.2.3 Graphic Display of Sample inch
  
• II.3 Corrections for Measuring the Hardness as Taken from Spherical Surfaces
  
• III. Density, Weight, and Number of Conventional Material for Balls

3. Tables:

• A—Reference Table with Specifications for Conventional Material
• B – Requirements for the Fullness of Containers for Carbon Steel Balls
• C – Tolerances Pertaining to the Quality of Balls
• D – Tolerances Pertaining to the Quality of a Large Number of Balls
• E1, E2, E3 – Preferred Ball Size
• F - Accepted Quality Level
• G - Resonance Rise
• L1, L2 - Number of Balls
• M1, M2 - Weight of Balls