BRINNELL HARDNESS B039
A method of measuring the hardness of metal parts and hard seal faces.
In this test a hardened steel ball is forced into the material at a given pressure. The width of the depression then becomes the measure of the material’s hardness.
Above a number of 350 the standard machining operations of turning, boring, drilling, and tapping become uneconomical.
You can compare a Brinnell reading to the following file readings:
100 – Metal removed easily by the file.200 – Slightly more pressure needed to remove metal.
300 – Metal shows resistance to the file.
400 – Takes more pressure on the file.
500 – File removes almost no metal.
600 – Metal cannot be filed.