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I have a technical drawing, but I can't understand the "h2". The "h2" points to a hole, and I don't understand it. Can you please give me an answer? Thanks!

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  • $\begingroup$ A picture showing reference to h2 would help $\endgroup$
    – Fred
    Mar 2, 2020 at 12:32

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H2 refers to the tolerance of the hole - whether it’s an upper or lower case letter shows if it’s a hole or shaft tolerance. In this case, as you mention it’s on a hole, I would expect it to be “H6”, which means for an 6.00mm hole, it would be acceptable if manufactured in the range 6.00-6.03mm in diameter.

enter image description here

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  • $\begingroup$ The red annotations on the image are not my own - it’s a screenshot from this video that I found on google images youtu.be/c8TKftViusQ $\endgroup$ Mar 2, 2020 at 7:54

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