About Gears
More
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.
Stainless steel pulleys can be wetted repeatedly without rusting or staining.
Bushing-mount pulleys grip the shaft more securely than press-fit pulleys, but require a quick-disconnect (QD) bushing or a split-tapered bushing (not included).
For technical drawings and 3-D models, click on a part number.
| OD, mm | Number of Teeth | Pitch, mm | ID | Bore Type | For Bushing Style | Inside Wd., mm | Outside Wd., mm | Overall Wd., mm | Pitch Dia., mm | Number of Flanges | Fabrication | Each | |
For 20 mm Max. Belt Wd. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 150.8 | 56 | 8 | 2.187" | Finished | Quick Disconnect Style SDS | 22.35 | 28.58 | 28.58 | 141.224 | 2 | Machined | 0000000 | 0000000 |
For 30 mm Max. Belt Wd. | |||||||||||||
| 150.8 | 56 | 8 | 2.187" | Finished | Quick Disconnect Style SDS | 31.75 | 38.1 | 38.1 | 142.6 | 2 | Machined | 0000000 | 000000 |
High-Strength HTD Timing Belt Pulleys
These HTD (high torque drive) pulleys have a curved tooth shape that provides higher strength than trapezoidal teeth. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.
Bushing-mount pulleys grip the shaft more securely than pulleys that press fit. Quick-disconnect (QD) bushings and split-tapered bushings sold separately.
For technical drawings and 3-D models, click on a part number.
| For Belt Trade Size  | OD, mm | Number of Teeth | Pitch, mm | ID | Bore Type | For Bushing Style | Inside Wd., mm | Outside Wd., mm | Overall Wd., mm | Pitch Dia., mm | Number of Flanges | Fabrication | Material | Each | |
For 15 mm Max. Belt Wd. | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H5M | 96.52 | 56 | 5 | 1.871" | Finished | Quick Disconnect Style SH | 16.51 | 21.34 | 21.34 | 89.128 | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
For 20 mm Max. Belt Wd. | |||||||||||||||
| H8M | 151.13 | 56 | 8 | 2.187" | Finished | Quick Disconnect Style SDS | 22.35 | 28.7 | 28.7 | 142.595 | 2 | Machined | Black-Oxide Iron | 00000000 | 000000 |
For 30 mm Max. Belt Wd. | |||||||||||||||
| H8M | 151.13 | 56 | 8 | 2.187" | Finished | Quick Disconnect Style SDS | 31.88 | 38.23 | 38.23 | 142.595 | 2 | Machined | Black-Oxide Iron | 00000000 | 000000 |
High-Strength GT Timing Belt Pulleys
For higher speed or higher torque applications, these GT series timing belt pulleys provide a more precise fit than HTD pulleys. Use them where accuracy is critical, such as in storage and retrieval systems or in robotics. Similar to HTD timing belt pulleys, their teeth are curved for high strength. The curved teeth create positive grip engagement with timing belts, so these pulleys do not require re-tensioning—unlike drives using V-belts or sheaves. And unlike chain drives, there’s no metal-on-metal contact, so these pulleys don’t require lubrication.
Anodized aluminum pulleys are lightweight and resist corrosion. They have a finished bore and come with set screws for mounting on shafts.
For technical drawings and 3-D models, click on a part number.
| Number of Teeth | Pitch, mm | For Shaft Diameter | Bore Type | Outside Width, mm | Overall Width, mm | Pitch Diameter, mm | Fabrication | Material | Hub Diameter, mm | Each | |
For 9 mm Maximum Belt Width | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 56 | 3 | 5/16" | Finished | 12.7 | 22.26 | 53.467 | Machined | Anodized Aluminum | 31.75 | 00000000 | 000000 |
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.
Gears with teeth that are not hardened can be hardened to fit your application.
Stainless steel gears and racks resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning.
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 | Teeth Heat Treatment | Dia., mm | Wd., mm | Each | |
Round Bore | ||||||||||||
| 1 | 56 | 56 | 58 | 10 | 20 | 10 | 303 Stainless Steel | Not Hardened | 40 | 10 | 00000000 | 000000 |
Plastic Gears and Gear Racks—14 1/2° Pressure Angle
A former industry standard, 14½° pressure angle gears are often found on older machinery. 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.
For technical drawings and 3-D models, click on a part number.
Round/Machinable
Bore
Hub | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch | Number of Teeth | Gear Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Material | Fabrication | Color | Dia. | Wd. | Each | |
Round Bore | |||||||||||||
| 48 | 56 | 1.167" | 1.2" | 1/8" | 0.375" | 3/16" | Nylon Plastic | Molded | White | 0.625" | 0.25" | 00000000 | 000000 |
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.
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 | 56 | 28 | 29 | 3 | 8 | 6 | Acetal Plastic | Molded | White | 14 | 5 | 00000000 | 00000 |