The Rockwell scale gauges a material’s hardness by how resistant it is to being indented. The Rockwell test measures the difference between the depths of an indenter’s penetration of a material under a large load and a preload (minor load). A single letter is used to designate various scales that use various loads or indenters. A result is a dimensionless number represented by the letters HRA, HRB, HRC, etc., where the final letter denotes the relevant Rockwell scale.

When evaluating metals, the linear correlation between indentation hardness and tensile strength exists.

A minor load and a significant load must be applied to ascertain a material’s Rockwell hardness. The minor load establishes the zero position. While the heavy weight is applied and removed, the light load is kept constant. A dial with a harder material has a lower reading when measuring the depth of penetration in relation to the zero datum. In other words, there is an inverse relationship between hardness and penetration depth. By only displaying hardness values, Rockwell hardness avoids the time-consuming calculations required by other hardness evaluation systems.

NextGen’s Ultrasonic Contact Impedance Hardness Tester – UH200 economical line measuring range is HRC(10-80) HB (200-550) HV (200-999).

Click here to obtain a personalized quote!