Hi all,

I have a Hammond 1551R box into which fits a small PCB.
The recommended shape of the PCB is given in the datasheet:
(http://www.hammondmfg.com/pdf/1551R.pdf)
I have received the PCB and it fits perfectly, but the Hammond box only=20
came with the 2 screw for the lid and none for the PCB mount holes. The=20
sizes specified are 2.5mm for the PCB hole diameter, but the screws are=20
given as 32 x 3/16" self tapping.
So the question is - what does this translate to in metric sizes? I get=20
the 3/16" is probably the length, but what does 32 stand for? Is it for=20
a 1/32" thread?
I have trawled through pages and pages of all the many different=20
"standards" - Whitworth, BAS, UTS, etc but I can't fit 32 into anything=20
that seems to fit properly.
The UTS (Hammond are US so I assumed this would be the most likely) is=20
specified as X-Y where X is the diameter and Y is the thread turns per=20
inch. 1/32 would give a diameter of 0.8mm and 3/16 means nothing in=20
terms of turns per inch. Even if you swap them round it doesn't make sense.
Whilst linking to the above datasheet I noticed it's actually different=20
from the one I have, and gives #2 x 3/16" instead of the aforementioned=20
32 x 3/16". This makes more sense as #2 equates to 2.18mm diameter=20
shank, but I'm still unsure as to the thread (not that it matters too=20
much as it's self tapping, but I'd like to know anyway)
I'm going to order some number 2 screws, but can anyone help me to=20
confirm exactly what the numbers mean for future reference?

--=20
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