We recommend using the M4 steel mounting screw to mount IG42 motors. We use these in our IG42 DB Robot Platform when mounting through two 1/8" thick plates.
This is the chain and sprocket kit for the IG42-DB4 robot platform. It includes 10 tooth and 15 tooth sprockets, 5 feet of chain, and 4 connecting links.
This is a 1.75" x 1.75" x .125" thick aluminum plate designed to mount our IG42 motors.