Worm & Pinion Gears

Worm and pinion gears, also referred to as worm wheel gears, are types of gear compositions used in a wide range of industrial and domestic applications that require very large reduction ratios to be achieved with higher torque. The worm gear resembles a threaded shaft that utilises teeth to drive the gear, allowing for machinery and components to operate. Each time the shaft or worm spins one revolution, the gear turns forward by only one tooth. Therefore, if the gear has 50 teeth, this creates a gear ratio of 50:1. To summarise, the pinion gear and worm work together in a gear arrangement often referred to as a worm drive.

How do worm and pinion gears work?

When rotational power is applied to the worm, say, using an electric motor, it rotates against the gear and transfers torque to the pinion gear similar to a spur gear. The system is designed so that the worm can easily turn the pinion 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 which is known as self-locking.

What are worm and pinion gears used for?

Worm and pinion 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 Material Gear Direction Number of Starts Overall Length Overall Diameter Pitch Diameter Pressure Angle Hub Diameter Face Width Number of Teeth
RS Stock No. 521-6890
BrandRS PRO
SGD26.11
Each
units
1 Steel RH 1 32mm 18mm 16mm 20° - - -
RS Stock No. 521-6834
BrandRS PRO
SGD45.22
Each
units
0.8 Bronze - - - - 16.03mm - 12mm 18mm 20
RS Stock No. 521-6935
BrandRS PRO
SGD47.92
Each
units
1 Bronze - - - - 20mm - 16mm 14.5mm 20
RS Stock No. 521-6963
BrandRS PRO
SGD101.21
Each
units
1 Bronze - - - - 40mm - 26mm 16.5mm 40
RS Stock No. 521-6884
BrandRS PRO
SGD113.26
Each
units
0.8 Bronze - - - - 40.06mm - 25mm 18mm 50
RS Stock No. 521-6840
BrandRS PRO
SGD61.55
Each
units
0.8 Bronze - - - - 24.16mm - 18mm 18mm 30
RS Stock No. 521-6907
BrandRS PRO
SGD30.78
Each
units
1 Bronze, Steel RH 2 32mm 18mm 16mm 20° - - -
RS Stock No. 521-6812
BrandRS PRO
SGD30.11
Each
units
0.8 Bronze, Steel RH 2 30mm 15.6mm 14mm 20° - - -
RS Stock No. 521-6828
BrandRS PRO
SGD45.22
Each
units
0.8 Bronze - - - - 16.11mm - 12mm 18mm 20
RS Stock No. 521-6957
BrandRS PRO
SGD71.71
Each
units
1 Bronze - - - - 30mm - 20mm 16.5mm 30
RS Stock No. 521-6979
BrandRS PRO
SGD138.62
Each
units
1 Bronze - - - - 50mm - 30mm 20mm 50
RS Stock No. 521-6878
BrandRS PRO
SGD83.76
Each
units
0.8 Bronze - - - - 32.05mm - 20mm 18mm 40
RS Stock No. 521-6913
BrandRS PRO
SGD47.92
Each
units
1 Bronze - - - - 20.16mm - 16mm 20mm 20
RS Stock No. 521-6856
BrandRS PRO
SGD61.55
Each
units
0.8 Bronze - - - - 24.04mm - 18mm 18mm 30
RS Stock No. 521-8559
BrandRS PRO
SGD29.32
Each
units
0.8 Steel RH 1 30mm 15.6mm 14mm 20° - - -
RS Stock No. 521-6941
BrandRS PRO
SGD72.65
Each
units
1 Bronze - - - - 30.24mm - 20mm 20mm 30