12T Track Drive Sprocket
A 12-tooth, 12 mm-pitch drive sprocket (Ø51.2 mm over the teeth, 10 mm disc) for the 'N20 Twin-Track Mini Tank Chassis' kit. It fits directly onto an N20 gearmotor's 3 mm D-shaft with a 3.2 mm blind bore in a 16 mm hub that is 12.5 mm long. An M3 grub screw and a captured M3 hex nut lock it to the shaft, so no separate hub or plate stack is needed. The teeth have a 45° underside chamfer so they print without supports, and they mesh with the kit's print-in-place track links.
robotics kit sprocket n20