Rockwell Testers

The Rockwell hardness test is based on an inverse relationship to the measurement of the additional depth to which an indenter is forced by a heavy total or major load beyond the depth resulting from a previously applied preliminary or minor load. Rockwell hardness values are expressed as a combination of a hardness number and a scale symbol representing the indenter and the minor and major loads. The hardness number is expressed by the symbol HR and the scale designation.


  • Steel
  • Copper
  • Cast irons
  • Thin materials
  • Cemented carbides
  • Deep case hardened materials
  • Shallow case hardened materials