Nubs are hubs intended to connect motion components to spinning shafts, like sprockets gears, pulleys and wheels. This Nub features a round boss on both sides with a 5 mm hex bore in the middle. This bore allows for pairing of REV 5mm hex components with other motion parts that interface with Nubs. The four mounting holes on these nubs are sized at 0.128" diameter, with the intention of accepting a #6-32 threaded screw. They are not tapped, but can be tapped by most machine screws once they are driven in the first time. Specifications: