Hardness, Brinell Hardness, HBW, HRB, HRC, Rockwell 22 RC ...
A designation of hardness, usually of steel, performed by pressing a 10 mm spherical tungsten carbide ball against a clean prepared surface using a 3000 Kilogram force, producing an impression, measured and given a special numerical value. This numerical value relates to steel tensile strength. ... (Sometimes RC) An abbreviation for Rockwell ...