International Association of Penturners - View Single Post - 2018 Kitless Pen Tap and Die Group Buy
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Old 05-16-2018, 04:07 PM   #47 (permalink)
duncsuss's Avatar
Join Date: Jun 2012
Location: Wilmington, MA
Posts: 1,298
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Originally Posted by eharri446 View Post
If anyone can shed any additional light on the actual size, I would appreciate it.
I can't speak from authority, but I can say that some JoWo #6 housings are very tight when I screw them into sections made with my M7.4 x .5 tap. To the point where I'm thinking about getting one of the M7.5 x .5 taps to get that little bit extra slack in there.

I believe the 0.1mm diameter difference gets divided in two, resulting in 10% less active thread each side (0.1mm / 2 = 0.05mm, 0.05 / 0.5 = 10%). I can live with that if it means I can get the housing out of the section without mangling parts.
Duncan Suss
website: FruitOfTheLathe | facebook: FruitOfTheLathe

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