[MrForbes]

Mostly 5/32" and 1/8", of course it depends on the materials being riveted, and where it is on the robot. Much of the stuff we do with rivets is connecting gusset plates to tubes, generally 1/16" thick. Thicker materials get bigger rivets. We seldom find a need for 3/16" rivets, and have never used 1/4" rivets. We also use a lot of #10 and 1/4" screws and bolts, mostly where stuff needs to be disassembled.