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What is the value of hardness for plug and ring gauges used for self-holding tapers?

What is the value of hardness for plug and ring gauges used for self-holding tapers? Correct Answer 750 to 860 HV

Good quality steel is used for making these gauges and these are suitably heat treated to give hardness of 750 to 860 HV and for stabilization. Gauges surfaces should be free from rust, crack and burrs.

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