Can someone please tell me the difference between a "2b" and "gh3" fit of the thread on a tapped thru hole? i know it has something to do with a roll form thread and this is a very specific protocal?
Bascially, the gh3 defines how much over basic size the threads should be. In "2b", the "2" describes the closeness of fit between the two parts; the "b" specifies the female part and is also used to describe the combination of the two.
See http://www.newmantools.com/taps/taptech.htm for a fairly good explanation.
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