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What is the minor diameter tolerance of effective diameter for external threads?

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What is the minor diameter tolerance of effective diameter for external threads?

(a) Effective diameter tolerance+0.03√p & Effective diameter tolerance+0.01√p

(b) Effective diameter tolerance+0.02√p & Effective diameter tolerance+0.01√p

(c) Effective diameter tolerance+0.013√p & Effective diameter tolerance+0.02√p

(d) Effective diameter tolerance+0.01√p & Effective diameter tolerance+0.02√p

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This question is from Tolerance for Screw Thread Gauges and Screw Threads topic in chapter Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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The correct option is (c) Effective diameter tolerance+0.013√p & Effective diameter tolerance+0.02√p

Easy explanation: Minor diameter tolerance for external threads is (effective diameter tolerance + 0.013√p) for close fit and is ( effective diameter tolerance +0.02√p) for external threads in case of medium and free fit.

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