The Rockwell hardness test method, as defined in ASTM E-18, is the most commonly used hardness test method. You should obtain a copy of this standard, read and understand the standard completely before attempting a Rockwell test. Preliminary test loads (preloads) range from 3 kgf (used in the “Superficial” Rockwell scale) to 10 kgf (used in the “Regular” Rockwell scale). Total test forces range from 15kgf to 150 kgf (superficial and regular) to 500 to 3000 kgf (macrohardness).

Test Method Illustration

A = Depth reached by indenter after application of preload (minor load) 

B = Position of indenter during Total load, Minor plus Major loads 

C = Final position reached by indenter after elastic recovery of sample material 

D = Distance measurement taken representing difference between preload and major load position. This distance is used to calculate the Rockwell Hardness Number.

NG RockGen – Analogue Series Rockwell Hardness tester has the following three ranges. First, HRA: 20-88, second, HRB:20-100, and finally HRC:20-70. If you want more information about NG-RockGen – Analogue Series Rockwell Hardness Tester or If you want to obtain a personal quote, click here.