BHN Bullet Abbreviation

Brinell Hardness Number

A saltwater solution for quenching or cooling when heat treating steel.  Or A common standard method of measuring the hardness of materials. The smooth surface of the metal is subjected to indentation by a hardened steel ball under pressure. The diameter of the indentation, in the material surface, is then measured by a microscope and the hardness value is read from a chart or determined by a prescribed formula.