Planetary Gearheads We offer a number of compact and low noise PG series planetary gearheads which can provide up to 3.5NM torque. Output shaft, gear material, bearing and gear ratio can be customized. PG22X PG24X PG28X PG32X PG36X PG22X PG22X series planetary gearbox. PG24X PG24X series planetary gearbox. PG28X PG28X series planetary gearbox. PG32X PG32X series planetary gearbox. PG36X PG36X series planetary gearbox.