I am new to CAD and reading prints and from time to time see a " h " being used between the dim. line , what does that letter represent ? (height or hollow or is it a DATUM letter ) Thanks - BJ
Need help with a dimension symbol " h ".
Oct 09, 2004
1 Replies
: "Robert Johnson" wrote : I am new to CAD and reading prints and from time to time see a " h " : being used between the dim. line , what does that letter represent ? : (height or hollow or is it a DATUM letter ) Thanks - BJ
Are you seeing something like 25 h7? If so, the h designates a class of fit between hole and shaft documented in ANSI B4.2. This is part of an ANSI/ISO standard for metric fits.
David Janes
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