Worm Wheel Gears

A worm wheel gear (which is similar in appearance to a normal gear or spur gear) meshes with a worm gear (a gear in the form of a screw) in a gear arrangement referred to as a worm drive. This setup allows you to either greatly reduce speed or greatly increase torque.

How do worm wheel gears work?

When rotational power is applied to the worm, say, using a motor, it rotates against the wheel and transfers torque to the worm wheel gear. The system is designed so that the worm can easily turn the worm wheel gear, but the gear cannot transmit motion back to the worm. When the gear tries to turn the worm, friction between the two elements prevents the worm from turning.

What are worm wheel gears used for?

Worm wheel gears can be found in domestic devices as well as in heavy machinery. They are useful for machines such as conveyor systems, tuning instruments, lifts and elevators, gates and in torsen differentials used in high-performance vehicles and trucks.


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Description Price Module Number of Teeth Pitch Diameter Hub Diameter Face Width Material
RS stock no. 521-6979
BrandRS PRO
R 760.68
Each
units
1 50 50mm 30mm 20mm Bronze
RS stock no. 521-6884
BrandRS PRO
R 617.87
Each
units
0.8 50 40.06mm 25mm 18mm Bronze
RS stock no. 521-6834
BrandRS PRO
R 244.96
Each
units
0.8 20 16.03mm 12mm 18mm Bronze
RS stock no. 521-6913
BrandRS PRO
R 260.68
Each
units
1 20 20.16mm 16mm 20mm Bronze
RS stock no. 521-6828
BrandRS PRO
R 244.96
Each
units
0.8 20 16.11mm 12mm 18mm Bronze
RS stock no. 521-6957
BrandRS PRO
R 391.30
Each
units
1 30 30mm 20mm 16.5mm Bronze
RS stock no. 521-6935
BrandRS PRO
R 260.68
Each
units
1 20 20mm 16mm 14.5mm Bronze
RS stock no. 521-6840
BrandRS PRO
R 334.46
Each
units
0.8 30 24.16mm 18mm 18mm Bronze
RS stock no. 521-6963
BrandRS PRO
R 554.26
Each
units
1 40 40mm 26mm 16.5mm Bronze
RS stock no. 521-6941
BrandRS PRO
R 391.68
Each
units
1 30 30.24mm 20mm 20mm Bronze
RS stock no. 521-6856
BrandRS PRO
R 334.46
Each
units
0.8 30 24.04mm 18mm 18mm Bronze
RS stock no. 521-6878
BrandRS PRO
R 455.48
Each
units
0.8 40 32.05mm 20mm 18mm Bronze