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Date: Sun, 14 Oct 2007 16:39:45 -0700 (PDT)
From: Scott <squiggles@yahoo.com>
Subject: Tap Size for Heater Outlet
To: flyrotary@lancaironline.net
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Message-ID: <378961.68253.qm@web52705.mail.re2.yahoo.com>

Point taken on the NPT sizes( http://en.wikipedia.org/wiki/National_pipe_th=
read#Pipe_thread_sizes )...I had a steel an-6 laying around and its threads=
 engage the ID of the tube pretty well per http://en.wikipedia.org/wiki/AN_=
thread that would mean something in the 9/16" ID.  Which would correspond t=
o the drill size for 3/8 npt( http://ww2.mne.ksu.edu/classes/ME300/Referenc=
e/npt%20tapdrill.htm ).  However, 3/8npt seems perilously  close to the OD =
of 11/16( measured using the poor mans calipers, a crescent wrench ).=0A=0A=
Thus, if everything is same on our blocks perhaps something of the order of=
 a 5/8x18 or x20 would be more appropriate?=0A=0AThoughts?=0A=0A-Scott=0A(H=
oping clear weather holds for another 14 days...)=0A=0A=0A=0A=0A=0A=0A     =
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