An all-aluminum timing belt pulley for GT2 belt (2 mm pitch) 6 mm wide (up to 6.35 mm wide).
This pulley has 20 teeth and an 8 mm bore. A small number of NEMA 23 motors have shafts of this diameter. The pulley can also be used to belt-drive M8 treaded rod or T8 trapezoidal leadscrew.
It has two M4 grub screws (at 90? to each other), which require a 1.5 mm hex key (Allen key). The pulley is 17 mm long overall, has a 16 mm diameter hub, and a flange at the opposite end. Unlike rubbish aluminum pulleys often found on, which have a flat flange than can chafe the belt, this is a well-made pulley, with an embossed flange, slightly rounded on the side facing the belt, and the hub is also chamfered.