Guys I'm getting ready to place an order and I need to order some hardware I'v got a couple bolts/blind nuts that got stripped and I'm trying to figure out what size they are.
Is there an easy way to figure it out so I know if its 4-40 2-56 etc....
Thanks!

one is about 3/32" and 1/2" long
the other is 3/16" and 3/8" long

so would the first be 2-56
and the second 4-40

The 3/32 is 4-40 The 40 is the # of threads per in. and you oder them by length so you want 4-40s by 1/2 in long.
the other ones sound like 10-24 which are 3/16 in. dia. so order them at whatever length you need. Hope this helps.

well there are two of the 3/16" screws that hold the main gear on and they seem a little small to me esp since they keep loosening up from use (even with loctite) and actually stripped a thread on one of the screws during a hard landing.
So if I wanted to upgrade the bolts/blind nuts what would be a good / bigger size to go with?

Next size up would be 1/4- 20 or ask for 1/4 course. that'll hold the suckers.