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Grade is a measure of the roundness or spherical deviation of the ball.
For example a ball with grade:
  • 1000 has a spherical deviation of .001 and a lot diameter variation of +/- 0.001
  • 5 has a spherical deviation of .000005 and a lot diameter variation of +/- 0.000005
The lower the grade number the more round the ball is.  This means that grade 5 balls are a lot more round and the balls in a lot will be closer to the same diameter in size than those that are grade 1000.  Grade 5 balls will also be smoother balls than those that are grade 1000.

The grade that is needed is determined by the application. Higher-precision applications will use a better-grade (lower number) ball.

Order code - Grade highlighted

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