1) Standard worms and worm gears, single thread right hand: For high to medium transmissions. For simple applications, e.g. manual operation or occasional motorised operation. Continuous operation is possible at medium torques. Sorted by number of threads and module. The gear wheels can be combined with worms having the same module and the same number of threads to make different transmissions. This results in the different centre distances.

2) Standard worms and worm gears, double thread right hand: Like above, but for medium to low transmissions.

3) Precision worm gear sets: Ideal for continuous operation at high speeds and torques. Mostly ready-to install without needing reworking. Hence they are also economical for simple applications. Sorted by centre distance. The gear wheels can only be used with worms having the same centre distance and the same transmission.