CR018 - 2MM x 4 FK motor can screws.
IMO, the ultimate Retro motor screw.
Long enough to work on any common commercial motor bracket, but not too long to need washers.
More importantly, a nice deep socket, for ease of use with a ball end wrench, when changing motors, with the gear/axle assembly, in place.
Black oxide coating.
Uses a 1.5MM wrench.