The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
Correct answer: C. 0.002
- A. 0.001
- B. 0.01
- C. 0.002
- D. 0.02
Explanation
One Rockwell hardness number represents a permanent indentation-depth change of 0.002 mm. The smaller depth increment reflects the high sensitivity of the Rockwell scale.
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