There are advantages in being able to grind a tool, then cut a one off thread on a bit of tapered carbon steel, gash it, harden it, hone it and use it :-)
Mark Rand RTFM
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17 years ago
7/32-40 tap?
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17 years ago
included angle = 47.5 degrees
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17 years ago
Yikes! Now I know why my neighbor (gun buff) had me make one for him..... Ken.
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17 years ago
Guilty M'lud
Mark Rand RTFM
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17 years ago
Well I think Steve is right. The tap I received is marked:
7/32-40 NS GH3 HS PolandI couldn't find it on tap drill chart so I calculated it this way:
7/32 - 1/40 which tends to be pretty close. That worked out for me as a #10 drill.Anyway, my Williams rear sight aperture fits fine in a hole I tapped so I am happy.
I wished I had noticed they have the matching die
7/32-40 1-368-05-40 7.59 since shipping cost as much as the tap. Still, 16 bucks delivered beat Brownells price less shipping by 8 bucks.Wes S
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17 years ago
Just as a side note, most of the Model Engineer thread pitches have a UNS equivalent. The rest are covered in UNF, and UNC.
Steve R.