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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

(OP)
Hi,

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  ?

Thanks,

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