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According to IS: 4218 (Part II)-1976, How many types of pitches are present?

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According to IS: 4218 (Part II)-1976, How many types of pitches are present?

(a) 2

(b) 1

(c) 4

(d) 3

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This intriguing question originated from Diameter and Pitch Combinations topic in division Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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The correct choice is (a) 2

The best I can explain: According to this  IS: 4218 (Part II)-1976, there are two types of pitches i.e. coarse series and fine series. For any diameter in study, coarse pitch is the largest of the pitches associated with that diameter (it has nothing to do with quality), the rest of the pitches being always finer than the coarse pitch are called fine pitches.

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