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looking for explanation of GH5 tapping spec

looking for explanation of GH5 tapping spec

looking for explanation of GH5 tapping spec


We have an application that requires easy threading of a 4"
1/2 13 bolt into a 4" long coupling nut.

My problem is that every time I read the GH specs I find on the web, I can't tell which way the extra .0005" goes and/or whether it's a tap or die that is being discussed.

We're looking for a tap that makes a slightly bigger diameter thread hole that loosens up the tolerances on the bolt/nut mating. Can someone say which GH tap to go with  ?

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