Screw for FS90R servo wheels

What size screw is it that goes in the center hole of the FS90R servo wheels?

Not the two 4-40 holes for the universal hubs, but the center hole that’s designed just for the FS90R.


There are two different types of screws included with the FEETECH FS90R. One is a self tapping M2 screw that is about 8mm in length, and the other is an M2 screw that is about 5mm in length. I measured their diameters to be about to be about 2.0mm for the long screw and 2.25mm for the shorter screw.