Date: Mon, 17 May 93 16:38:06 pdt
From: Roland Dudley <cobra@cdc.hp.com>
Well, the fitting size at the tank outlet is still a mystery. After
carefully measuring the distance between threads, I concluded that the
pitch was 14 per inch. In spite of not being able to screw a 1-14 nut
onto the male fitting I'd removed from the tank, I decided to try 1-14
bolt in the female half. It screwed in easily but was too loose to be
the correct diameter. Well, at least I know the thread pitch. Was
there a Whitworth size just slightly over 1"? Maybe 33/32 or
thereabouts? One of my Whitworth wrenches was the only one that would
work on the fitting.
According to the Machinery's Handbook, 1" Whitworth fasteners come in
only two pitches, 8 and 10 tpi. However, in the 'British Standard Pipe
Threads for Non-pressure-tight Joints' section, I found the following
listing:
Nominal size 7/8"
TPI 14
Depth of Thread 0.0457"
Major Diameter 1.1890"
Pitch Diameter 1.1433"
Minor Diameter 1.0976"
This sounds like what you have. God knows where you will find such a
beast, though.
James
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