After performing this experiment, the learner will be able to:

• Understand the principle of the Rockwell hardness test.
• Determine the Rockwell hardness number (HR) of a metallic specimen using the appropriate Rockwell scale.
• Study the effect of major and minor loads on indentation depth.
• Become familiar with the construction and working of the Rockwell hardness testing machine.
• Interpret hardness values for comparing engineering materials and selecting suitable materials for practical applications.