In the sketch M8 6H means what?

The drawing is a part of a machine. Stuck with realizing its dimensioning M8 6H

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4 Answers

m8 means metric thread 8mm of ISO standard and 6H refers to tolerance of threaded hole (know more about it in ISO 2768)

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M8 means metric thread of 8mm outer diameter. but i dont have idea about the 6H

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Metric fastener size designation nomenclature. As fully explained in ISO 965-1,

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