The hardness of tool steel is usually measured on the Rockwell C-scale. This is the most accurate measurement method for the range of hardness in which tool steel is typically used. The Rockwell C-scale is most accurate for hardnesses of RC 45-70. Softer material may be routinely measured on the Brinell hardness scale. The Brinell hardness scale is accurately used for hardnesses in the range of 225 - 400 BHN. Occasionally the hardness must be converted from Brinell to Rockwell C-scale. The chart below makes easy reference for the proper conversion.
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