On Mon, 05 Nov 2007 08:08:16 -0800, matt
wrote:

On Nov 3, 10:26 pm, "desperado" wrote:
I have never seen taps, dies or even rethreading taps and dies to cut garden
hose thread, which I believe is 3/4 11 1/2 size.
Anybody have any sources?--
don paolino

This looks to me like a forest-and-trees scenario, based on the
replies
and discussion. There are two different types of this thread; one type
is
the thread on the end of your hose bibb coming out of the side of your
house. This thread is clearly a more-or-less standard V-thread form,
and
this is the male thread onto which you screw your hose. The second
type is the male thread on the end of a length of hose, which is
typically
a roll-formed thread, unless you have paid for a "high-end" hose like
those used in plant nurseries (3/4" id, rubber, "industrial" rating).
The
fitting on the OTHER end of the hose, the female end, is usually a
standard V-thread form, although I have seen some hoses that had
a roll-formed insert for the thread (bad, bad idea).

The major point is that you can take these fittings and join them at
the fittings interchangeably, so the functional fit can be specified
as
whatever the V-thread form specs actually are. There are indeed hose
thread specs in Machinery's Handbook, under ANSI Standard Hose
Coupling Screw Threads. I'm sure that there are taps and dies made
to produce the V-thread forms, although they probably aren't at your
local Ace Hardware.

Richard Kinch says they're probably near the catalog section for
perpetual motion parts. Unfortunately, that section seems to be
missing from my catalog.

As a secondary point, I highly recommend paying more for a high
quality hose that doesn't have those silly roll-formed threads.

I've bought machine-cut brass couplings at Wal-Mart and at the local
good hardware store. They also have octagon wrench flats behind them.
There's enough brass there to easily silver-braze to something else if
desired. One example is Orbit SunMate Pro model 58113 for 5/8" hose.

Example:
http://tinyurl.com/2ywfwn

These are cut threads, not rolled. They're a lot cheaper at Wally's
when they have 'em.