Re: [TowerTalk] pipe tap drill size

[DGB <ns9i2016@Bayland.net>]

#7 drill (.201)- is best.  13/64 (.203) is 2nd best or 7/32 (.218) can 
be used but treads will be weaker (less thread).

de ns9i

r miles wrote:
> I am putting two gusset plates to hold truss supports on my homebrew 30m 
> Moxon. I'm using 1/4'' X 20 bolts. It's  been 40 yr.s since I worked in a 
> machine shop. Don't have the proper hole size chart  for taps anymore.  I 
> assume the hole size to be threaded 1/4 x 20 is less than 3/16''. Anyone have 
> a chart showing the proper size.TNX
> K9IL
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