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 12 mm Max. Belt Wd. | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R8M | 84.94 | 30 | 8 | 1.574" | Finished | Split Tapered Style H | 14.66 | 21.01 | 30.54 | 76.403 | 2 | Machined | Black-Oxide Steel | 00000000 | 0000000 |
For 22 mm Max. Belt Wd. | |||||||||||||||
| R8M | 84.94 | 30 | 8 | 1.574" | Finished | Split Tapered Style H | 24.64 | 30.99 | 40.52 | 76.403 | 2 | Machined | Black-Oxide Steel | 00000000 | 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.
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. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 84.94 | 30 | 8 | 1.625" | Finished | Split Tapered Style H | 22.35 | 28.58 | 28.58 | 76.4 | 2 | Machined | 0000000 | 0000000 |
For 30 mm Max. Belt Wd. | |||||||||||||
| 84.94 | 30 | 8 | 1.625" | Finished | Split Tapered Style H | 31.75 | 38.1 | 38.1 | 76.4 | 2 | Machined | 0000000 | 000000 |