Rockwell Hardness

Hardness determined from size of indentation using a diamond or steel ball and given load.

There are three scales used:

A scale diamond cone with 60 kilogram load.

B scale 1/16" steel ball with 100 kilogram load.

C scale 120° diamond cone with 150 kilogram load.

See also: Alpha Rockwell Hardness, Hardness, Superficial Rockwell Hardness Test.