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Terms and Definitions of Steel Balls ( Ⅲ )

Jun 29, 2017

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6. Ball lot: a number of steel balls which assume that manufacturing conditions are same and can be regarded as a whole.

7. Mean diameter of ball lot: in the ball lot, the arithmetic mean of mean diameter between the largest steel ball and the smallest steel ball.

8. Variation of ball lot diameter: in the ball lot, the difference of mean diameter between the largest steel ball and the smallest steel ball.

9. Ball grade: the specific combination include size, shape, surface roughness and sorting tolerance of steel balls.

10. Ball gauge: the difference between mean diameter of ball lot and nominal ball diameter, which is a quantity in the set.

Note: Each ball gauge is integer multiple of ball gauge spacing determined by the ball grade.

11. Deviation of a ball lot from ball gauge: mean diameter of ball lot minus the sum of nominal ball diameter and the ball and ball gauge.

12. Ball subgauge: a quantity in the set that is closest to the actual deviation of a ball lot from ball gauge.

13. Deviation of a ball lot from ball dimension: the difference between mean diameter of ball lot and nominal ball diameter.

14. Hardness: A measure of the compressive capacity determined by a specific test method.

Note: For steel balls, the test method is generally Rockwell hardness method.