System of Measurement System of Measurement |
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For Maximum Shaft Diameter For Maximum Shaft Diameter |
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Roller Chain Trade Size Roller Chain Trade Size |
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Hub Diameter Hub Diameter | Show |
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Hub Diameter Hub Diameter | Hide |
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Component Component |
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![]() | Gear |
Bore Type Bore Type |
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Finished | Machinable |
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Teeth Shape Teeth Shape |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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For Roller Chain Strand Type For Roller Chain Strand Type |
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For Belt Trade Size For Belt Trade Size |
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About Roller Chain and Sprockets
More
About Gears
More
Sprockets for Metric Roller Chain


Designed to meet ISO 606 and DIN 8187 international dimensional standards, these sprockets are for use with compatible ISO and DIN roller chain. They come machined to the shaft diameter size listed and are machinable up to the maximum shaft diameter size.
For technical drawings and 3-D models, click on a part number.
Number of Teeth | For Shaft Dia., mm | For Max. Shaft Dia., mm | OD, mm | Overall Wd., mm | Hub Dia., mm | Material | Specifications Met | Each | |
For DIN, ISO 05B Roller Chain (8 mm Pitch) | |||||||||
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9 | 6 | 8 | 26.6 | 12 | 15 | Steel | DIN 8187, ISO 606 | 0000000 | 000000 |
High-Strength Corrosion-Resistant HTD Timing Belt Pulleys
Move belts forward and backward or stop and start them in precise positions, especially in areas where rust is a concern. The curved teeth on these high-torque drive (HTD) pulleys have more surface contact with belts than traditional trapezoidal teeth, which allows you to apply more torque without damaging belts. These teeth fit together seamlessly to prevent backlash, or unwanted movement of the belt on the pulley, for a smooth, quiet cycle. These pulleys are often used in 3D printing, machine tool drives, robotics, and other applications where precision is essential. They are also known as curvilinear belt pulleys.
Pair pulleys with an HTD timing belt that has the same pitch. The width of your belt should not be larger than the maximum belt width listed.
Aluminum pulleys will not rust in damp or humid environments, but water left on the surface will cause them to corrode.
For technical drawings and 3-D models, click on a part number.



Manufacturer Series | OD, mm | Number of Teeth | Pitch, mm | For Shaft Dia., mm | Bore Type | Inside Wd., mm | Outside Wd., mm | Overall Wd., mm | Pitch Dia., mm | Number of Flanges | Fabrication | Hub Dia., mm | Each | |
For 6 mm Max. Belt Wd. | ||||||||||||||
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Gates PowerGrip 2GT | 15 | 20 | 2 | 5 | Finished | 7 | 8.2 | 16 | 12.2 | 1 | Machined | 15 | 0000000 | 00000 |
For 9 mm Max. Belt Wd. | ||||||||||||||
Gates PowerGrip 2GT | 15 | 20 | 2 | 5 | Finished | 10 | 11.2 | 19 | 12.2 | 1 | Machined | 15 | 0000000 | 0000 |
For 12 mm Max. Belt Wd. | ||||||||||||||
Gates PowerGrip 2GT | 15 | 20 | 2 | 5 | Finished | 13 | 14.2 | 22 | 12.2 | 1 | Machined | 15 | 0000000 | 0000 |
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.
High-Power Metal Gears

and Crossed Left-Hand
Gear (Sold Separately)

with Right-Hand
Teeth (Sold Separately)

The helical teeth on these gears stay in contact for longer than straight teeth, which allows them to transmit higher loads at higher speeds than spur gears.
For gears to mesh correctly, they must have the same pressure angle and pitch. All of these gears transmit motion in a straight line—make sure to get one left-hand and one right-hand gear. To change speed and torque in your assembly, pair two gears with different numbers of teeth.
Crossed helical gears, also known as screw gears, can be configured to transmit motion at a 90° angle. To transmit motion at a 90° angle, pair two gears with the same tooth direction. To avoid wearing down gears, which happens when you use the same material, we recommend mating gears with different materials. Made from carbon steel, these gears are strong, but not as strong as alloy steel gears.
For technical drawings and 3-D models, click on a part number.


Hub | ||||||||||||
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Module | Number of Teeth | Helix Angle | Gear Pitch Dia., mm | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Teeth Heat Treatment | Dia., mm | Wd., mm | Each | |
Left Hand | ||||||||||||
Round Bore—Black-Oxide 1045 Carbon Steel | ||||||||||||
1 | 13 | 45° | 18 | 20.38 | 10 | 20 | 6 | Not Hardened | 15 | 10 | 00000000 | 000000 |
Right Hand | ||||||||||||
Round Bore—Black-Oxide 1045 Carbon Steel | ||||||||||||
1 | 13 | 45° | 18 | 20.38 | 10 | 20 | 6 | Not Hardened | 15 | 10 | 00000000 | 00000 |
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 | 40:1 | 40 | 20° | 20 | 1 | 21 | 5 | 12 | 5 | 15 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
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 | |||||||||||||||||
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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 | 40:1 | 40 | 20° | 20 | 1 | 21 | 5 | 12 | 5 | Acetal Plastic | Molded | White | 15 | 7 | Right Hand | 00000000 | 000000 |