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Which of the following hardness is given by Solid steel tool maker’s flats?

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Which of the following hardness is given by Solid steel tool maker’s flats?

(a) 93HRC

(b) 83HRC

(c) 73HRC

(d) 63HRC

I have been asked this question during an interview.

My query is from Tool Maker’s Flats and High Precision Surface Plates in portion Linear Measurements of Engineering Metrology

1 Answer

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The correct option is (a) 93HRC

To explain I would say: Solid steel tool maker’s flats after proper heat treatment gives a hardness of 93HRC or 850HV as high hardness is a desirable property for precision flats.

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