[AMPS] 7289 screw threads

[John Fielding]

A little while back I asked for some clarification on the screw thread used to attach the
air cooler to these tubes.  It appeared to be 3/8" x 16 Whitworth.

I have now obtained the Eimac data sheet and it gives the thread as 15/32 -16UNS - 28.  I
don't have any American engineering books and wondered if someone could explain what this
means?  I suppose the 15/32 could be the inch fraction, making it just under 1/2", but
the tubes I have measured are smaller than this.

I also have the Eimac data sheet for the Y-579 and this gives the thread as 3/8-16UNS-28
which seems to tie in with what I measured.  I wonder why Eimac uses 2 different threads
for air coolers which look identical, or is the 15/32 a typo on the data sheet?

Sorry to be a nuisance but American data is sure hard to find in this country.

John	ZS5JF

from The Rainbow Nation.

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