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What is the hardness of gauging portion in plain plug gauges?

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What is the hardness of gauging portion in plain plug gauges?

(a) 450 HV

(b) 550 HV

(c) 650 HV

(d) 750 HV

This question was addressed to me in exam.

The origin of the question is Plain Gauges in division Limits, Fits and Gauges of Engineering Metrology

1 Answer

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Correct choice is (d) 750 HV

Best explanation: Gauging surfaces of plain plug gauges are suitably stabilized, lapped and ground. These surfaces are normally hardened to not less than 750 HV. For sizes up to 63 mm, double ended type of plug gauges are used, and for above 63 mm single ended are used.

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