Distance between indentations
The distance between two adjacent indentations must be at least 3 times the diameter of the indentation.
The distance between the center on an indentation and the edge of the specimen must be at least 2.5 times the
diameter of the indentation.
Changing the Indenter
If you need to change the indenter, replace the steel ball in a steel ball indenter, or change the indenter itself.
You must run at least 3 tests to make sure the new parts are securely seated before recording a hardness
reading.
Environment
1. Take care to protect the testing machine from shock or vibration during tests.
2. Make sure the following are kept clean; dirt and debris prevents proper seating and can affect the
hardness readings.
• Indenter
• Plunger rod
• Mating faces of the anvil and the elevating screw