About Gears
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Metal Gears and Gear Racks—20° Pressure Angle
The current industry standard, these 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears. Compared to plastic gears and racks, they’re better for high-load, high-speed, and heavy duty applications. Also known as spur gears.
Combine gears with different numbers of teeth to change speed and torque in your assembly. Combine a gear and rack to convert rotary motion into linear motion. To minimize your footprint, mount one or more standard gears inside of an internal gear.
For components to mesh correctly, they must have the same pressure angle and pitch/module.
Brass gears and racks are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.
For technical drawings and 3-D models, click on a part number.
Metal Worms and Worm Gears
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 pitch/module. These worms are compatible with plastic worm gears.
Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
Bronze gears have low friction and dissipate heat better than cast iron gears to provide a long service life for both the gear and the worm. They’re also more corrosion resistant than cast iron gears.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||||||
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Module | Speed Ratio | Number of Teeth | Pressure Angle | Gear Pitch Dia., mm | For Number of Thread Starts | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Dia., mm | Wd., mm | Material | For Thread Direction | Teeth Heat Treatment | Teeth Fabrication | Each | |
Round Bore—Bronze | |||||||||||||||||
0.5 | 15:1 | 30 | 20° | 15 | 2 | 16 | 5 | 12 | 4 | 12 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
0.5 | 30:1 | 30 | 20° | 15 | 1 | 16 | 5 | 12 | 4 | 12 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
0.8 | 20:1 | 20 | 20° | 16 | 1 | 17.6 | 9 | 18 | 5 | 12 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
0.8 | 10:1 | 20 | 20° | 16 | 2 | 17.6 | 9 | 18 | 5 | 12 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
Plastic Gears and Gear Racks—20° Pressure Angle
The current industry standard, these 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears. Made of plastic, they run quieter than metal gears and have good corrosion and chemical resistance. They’re also known as spur gears.
Combine gears with different numbers of teeth to change speed and torque in your assembly. Combine a gear and rack to convert rotary motion into linear motion.
For components to mesh correctly, they must have the same pressure angle and pitch/module.
Acetal gears are best suited for use in light duty machines or for prototyping.
Nylon gears can be operated without lubrication, so they’re commonly used in food-processing machines.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Module | Number of Teeth | Gear Pitch Dia., mm | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Material | Fabrication | Color | Dia., mm | Wd., mm | Each | |
Round Bore | |||||||||||||
0.5 | 40 | 20 | 21 | 3 | 7 | 5 | Acetal Plastic | Molded | White | 12 | 4 | 00000000 | 00000 |
0.5 | 45 | 22.5 | 23.5 | 3 | 7 | 5 | Acetal Plastic | Molded | White | 12 | 4 | 00000000 | 0000 |
0.5 | 48 | 24 | 25 | 3 | 7 | 5 | Acetal Plastic | Molded | White | 12 | 4 | 0000000 | 0000 |
0.5 | 50 | 25 | 26 | 3 | 7 | 5 | Acetal Plastic | Molded | White | 12 | 4 | 00000000 | 0000 |
0.8 | 30 | 24 | 25.6 | 4 | 9 | 6 | Acetal Plastic | Molded | White | 12 | 5 | 0000000 | 0000 |
0.8 | 40 | 32 | 33.6 | 4 | 9 | 6 | Acetal Plastic | Molded | White | 12 | 5 | 0000000 | 0000 |
1 | 15 | 15 | 17 | 10 | 20 | 6 | Nylon Plastic | Machined | Blue | 12 | 10 | 00000000 | 00000 |
1 | 16 | 16 | 18 | 10 | 20 | 6 | Nylon Plastic | Machined | Blue | 12 | 10 | 00000000 | 00000 |
Plastic Worm Gears
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.
For technical drawings and 3-D models, click on a part number.
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 | 30:1 | 30 | 20° | 15 | 1 | 16 | 5 | 12 | 4 | Acetal Plastic | Molded | White | 12 | 7 | Right Hand | 00000000 | 000000 |
0.8 | 10:1 | 20 | 20° | 16 | 2 | 17.6 | 9 | 18 | 5 | Acetal Plastic | Molded | White | 12 | 9 | Right Hand | 00000000 | 00000 |
Plastic Miter Gears
Connect two shafts at a right angle without changing shaft speed or torque. Made of plastic, these gears run quieter than metal gears and have good corrosion and chemical resistance.
For two gears to mesh correctly, they must have the same pressure angle, pitch/module, and number of teeth.
Acetal gears absorb less moisture than nylon gears and are less prone to dimensional change. They’re best suited for use in light duty applications such as prototyping.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Module | Number of Teeth | Pressure Angle | Gear Pitch Dia. | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Mounting Distance, mm | Material | Fabrication | Color | Dia., mm | Wd., mm | Each | |
Round Bore | |||||||||||||||
0.8 | 20 | 20° | 16mm | 17.1 | 3.5 | 10.8 | 5 | 16 | Acetal Plastic | Molded | White | 12 | 5 | 000000 | 00000 |