These plastic gears are lighter and quieter than metal gears—pair them with metal worms for lubrication-free operation. Worm gears use screw threads to make large reductions to shaft speed while transmitting motion at a right angle. They transmit motion from worm to gear and cannot be reversed. For gears and worms to mesh correctly, they must have the same pressure angle and module.
Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
Acetal gears are lightweight, and resist corrosion and chemicals. They absorb less moisture than nylon gears, so they’re less prone to dimensional changes. They’re best suited for light duty applications, such as prototyping.
Nylon gears are lightweight and stronger than acetal gears.
Hub
Module Speed
Ratio Number
of Teeth Pressure
Angle Gear Pitch
Dia., mm For Number of
Thread Starts OD,
mm Face
Width, mm Overall
Width, mm For Shaft
Diameter, mm Material Fabrication Color Diameter,
mm Width,
mm For Thread
Direction Each
Round Bore
0.5 10:1 20 20° 10 2 11 5 12 4 Acetal Plastic Molded White 9 7 Right Hand 4037N112 $10.66
0.5 20:1 20 20° 10 1 11 5 12 4 Acetal Plastic Molded White 9 7 Right Hand 4037N111 10.66
0.5 30:1 30 20° 15 1 16 5 12 4 Acetal Plastic Molded White 12 7 Right Hand 4037N113 11.33
0.5 40:1 40 20° 20 1 21 5 12 5 Acetal Plastic Molded White 15 7 Right Hand 4037N115 13.28
0.5 50:1 50 20° 25 1 26 5 12 5 Acetal Plastic Molded White 20 7 Right Hand 4037N116 14.93
0.5 60:1 60 20° 30 1 31 5 12 5 Acetal Plastic Molded White 25 7 Right Hand 4037N117 17.24
0.8 10:1 20 20° 16 2 17.6 9 18 5 Acetal Plastic Molded White 12 9 Right Hand 4037N119 11.99
0.8 50:1 50 20° 40 1 41.6 9 18 8 Acetal Plastic Molded White 25 9 Right Hand 4037N124 22.24
0.8 60:1 60 20° 48 1 49.6 9 18 8 Acetal Plastic Molded White 25 9 Right Hand 4037N125 27.24
1 10:1 20 20° 20 2 23 10 20 6 Nylon Plastic Molded Blue 16 10 Right Hand 4037N129 22.64
1 30:1 30 20° 30 1 33 10 20 6 Nylon Plastic Molded Blue 20 10 Right Hand 4037N131 29.17
1 50:1 50 20° 50 1 53 10 20 8 Nylon Plastic Molded Blue 30 10 Right Hand 4037N133 37.62
1.5 10:1 20 20° 30 2 34.5 12 22 8 Nylon Plastic Molded Blue 22 10 Right Hand 4037N127 26.86