The 28BYJ-48-16 16:1 Stepper Gearmotor is designed for control of HVAC vanes and similar low-demand equipment, these stepper-motor gearboxes have lots of hacking potential. This is the lower torque / higher speed 16:1.
This 28BYJ-48 is a 5V unipolar geared stepper motor. It features a 5 mm "Double-D" shaft, mounting lugs, and a nice 5-conductor 0.1 inch pitch connector. The gearing isn’t the beefiest or most precise, but it’s adequate for reasonable loads.
1x 28BYJ-48-16 16:1 Stepper Gearmotor
Size
Diameter: 28 mm
Height (excluding shaft): 20 mm
Double-D Shaft Diameter: 5 mm | Double-D shaft length: 9 mm
Cable length: 23 cm / 9 inch
Gearing: 16:1 (16.032:1)
Torque at 5V: FULL Step mode: 147 gmf.cm (2.04 in.oz) at 260 mA draw | HALF Step mode: 197 gmf.cm (2.73 in.oz) at 204 mA draw