In article , Tom Kay wrote:
Hi Knowledgeable Folks;

I am doing a design and need to know what difference there is between a
10-32 thread and a 3/16-32 thread. The seem very close on OD, they use the
same pilot drill, 5/32" and they obviously have the same thread pitch.

So, any info on this? If there is a difference, could you be specific
please, especially about which is bigger?

The 10-30 is marginally larger (0.0025" IIRC). However for a
new design, I would suggest that the more important feature is that
10-32 is a current standard, while 3/16-32 is an obsolete standard, so
it will be more difficult to source screws at present, and become more
so as time goes on. (This is in the US, of course. In Canada, you
might want to look for the nearest Metric size, unless your target
market is the US.) Perhaps a M5, which would have a diameter of
0.1969", instead of the 0.190" for 10-32, or 0.1875" for 3/16-32.

Best of luck,
DoN.
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