Material surface property as determined from a test such as Rockwell, Brinell, Vickers, etc.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards
Resistance of a material to indentation, measured by pressing a hardmetal ball or diamond indenter into a smooth surface under standard conditions.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards