Pulley, Timing, Motor, HiTorque Mini Mill
Weight: 0.07 lb
This is a timing belt pulley for type 5M belts.
It has 20 cogs. The bore is 14 mm in diameter and has a 5 mm keyway. The total length of the pulley and hub is 31 mm.
In your instruction manual, this part appears on the parts list as: