[simpits-tech] Tap question

[Bubba]

Marc Quintin wrote:
> I'm taping  1/4''-20, if I look at the tap chart it tells me to use
> a number 7 drill bit, is that 7/32 ? I did it with a 7/32 but the
> tread don't seem very deep . I also noticed that for a 5/16''-18
> tap, it's bit size F, what is size F ?

Nope, a 7 is a 7. In addition to fractional drills there are numbers and 
letters, too, for exact sizes. There's usually a nearest fraction drill size 
listed on the chart. 13/64", #7, or .201" is what you need for 75% depth 
threads.
-- 
Steve
mysticz28 at swbell.net
He who seeks will find, and he who knocks will be let in.