The zero-backlash spur gearheads are a special variant of the spur gearheads. These are constructed as dual pass spur gearheads with gears and housing made of metal. The backlash is reduced to a minimum by means of preloading, which is adjusted by turning the passes against one another and their preloading on the motor pinion. This makes them ideal for positioning tasks with high accuracy and low torque.
Zero-backlash gearheads are only available with motors mounted ex works.