Hardness Conversion Chart

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Ball Hardness Corrections for Curvatures

Tables

This table is used for converting Rockwell 'C' readings taken on ball surfaces to equivalent value applicable to flat surfaces. Hardness readings of balls are affected by the curvature and hardness level of the ball. Because of these factors, corrections are necessarily added to the as-read hardness. For ball sizes and hardness values other than those shown, values shall be interpolated.

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