[artdutra04]

5/32" rivets; #8-32, #10-32, and 1/4-20 screws.

The 5/32" rivets are most common individual hardware, followed by #8-32 and #10-32 screws for general purpose mechanisms. 1/4-20 screws are pretty much exclusively used for tube axles (dead axle shaft+standoff combo) or high-loading parts.

I try to avoid #10-24 and #6-32 like the plague as these are the most commonly broken tap sizes due to their ratio of pitch to shank diameter (look at a #6-32 tap wrong and it breaks), and #10-32 is WAY more common for COTS stuff.