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How many tolerance grades are there for ISO metric screw threads?

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How many tolerance grades are there for ISO metric screw threads?

(a) 4

(b) 5

(c) 6

(d) 7

This question was posed to me during a job interview.

The doubt is 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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Best answer
Correct option is (d) 7

The best I can explain: On ISO metric threads, tolerances are defined by tolerance position and tolerance grades. There are 7 tolerance grades and these are 3, 4, 5, 6, 7, 8, and 9. 3, 4 and 5 are for precision threads and 6 for medium quality and for less precision methods are 7, 8 and 9.

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