>>1 - When a thread size is expressed at, say, 10-32, what do the "10" and 
>>the "32" stand for?

>>2 - The AN system starts at AN3, which is 10-32. What would be the next 
>>smaller size in the standard Imperial system?

>10 refers to the size, probably 10 gauge and 32 refers to threads per inch.
>Question 2 probably 12-32 which would be a machine screw not AN.

I don't know what the numbering system for screws was based on, but as stated, 
#10 is equivalent to 3/16".  The next smaller size is #8 at @ 0.16".  #12 is 
larger, I "think" equivalent to 1/4"

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