Speed reducers are mechanical devices generally used for two purposes. The primary use is to multiply the amount of torque.

Worm gear reducers are also a popular type of speed reducer because they offer the greatest speed reduction in the smallest package. With a high ratio of speed reduction and high torque output multiplier, it's unsurprising that many power transmission systems make use of a worm gear reducer.

A Shaft Mounted Speed Reducer provides a very convenient method of reducing speed, since it is mounted directly on the driven shaft instead of requiring foundations of its own. It eliminates (1) the use of one, and sometimes two, flexible couplings and (2) external belt take-up arrangements.