I found when running these two gear motors with no load the gear head got very. After removing the gear plate I found the large gear is plastic. If loaded I do not think this gear would last very long!
Right-angle gearmotor lightweight and stout
We purchased 3 gearmotors for a university/industry research project. The gearmotor is lightweight yet powerful. We sawed off the eye opposite the shaft and mounted the motor flat against a plate. The output shaft is an oddball size (12.5mm) and the through-hole on the shaft is a bit larger than we could use to pin our pulley, so we drilled our own. Overall good value.