The instrument has a completely redesigned chassis made from aerospace aluminum which houses a high quality displacement gauge. The upper end (the shank) is the gripping area for insertion into a milling machine drill press, or lathe. The lower end is the load cell. It extends up into the body of the hardness tester and houses a center less ground precision spring which preloads the diamond tipped indenter.
The impression made by the indenter in the metal being tested is a very small hemisphere and is equivalent in size to a superficial examination. The movement of the indenter into the hardness tester causes the gauge pointer to read the corresponding Rockwell C Scale hardness.
Minimum sample thickness is 0.025" for most materials. If the indenter does not make a dimple on the opposite side, the material is thick enough for accurate testing. The Model 415C is designed for use in machine shops, laboratories; and by inspection and quality control personnel, heat treaters, tool and die makers, mechanics, welders, metallurgists, etc.
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