High-Strength HTD Timing Belt Idler Pulleys
Keep high torque drive (HTD) timing belt systems running tightly with these idler pulleys. Made with built-in, free-spinning ball bearings, they're installed on shafts or belt tensioners (not included) to remove slack from timing belts. By maintaining tension on the belt, these pulleys reduce wear and vibration in 3D printing, machine tool drives, robotics, and other linear motion applications that require precise positioning.
When replacing an idler pulley, be sure the pulley matches your belt's trade size.
Toothed pulleys are shaped to mesh with the teeth on a timing belt, which reduces wear on the belt's teeth.
Iron pulleys are strong and wear resistant, with a black oxide coating that protects them from corrosion in dry environments.
For technical drawings and 3-D models, click on a part number.
| OD | Number of Teeth | For Shaft Dia. | Dia. | Wd. | Shaft Mount Type | Bore Type | Fabrication | Material | Bearing Type | Each | |
For 30 mm Max. Belt Wd. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.85" | 19 | 1" | 1.85" | 1 5/16" | Press Fit | Plain | Machined | Black-Oxide Iron | Needle Roller | 0000000 | 000000 |
V-Belt Pulleys
UHMW pulleys can be machined to your exact specifications.
For technical drawings and 3-D models, click on a part number.
| OD | For Shaft Dia. | For Max. Shaft Dia. | Pitch Dia. | Wd. | Groove Dp. | Material | Body Type | Each | |
For 4L, A, AX Belts | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1.75" | 1/4" | 1/4" | 1.5" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 000000 |
| 2.05" | 1/4" | 1/2" | 1.8" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 2.25" | 1/4" | 1/2" | 2" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 2.55" | 1/4" | 1/2" | 2.3" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 3.05" | 1/4" | 3/4" | 2.8" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 4.05" | 1/2" | 1 1/2" | 3.8" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 4.45" | 1/2" | 1 1/2" | 4.2" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 5.05" | 1/2" | 2" | 4.8" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 5.45" | 1/2" | 2" | 5.2" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 6.05" | 1/2" | 2 1/2" | 5.8" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 7.25" | 1/2" | 2 3/4" | 7" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
| 8.45" | 1/2" | 3" | 8.2" | 3/4" | 0.49" | UHMW Plastic | Solid | 0000000 | 00000 |
For 5L, B, BX Belts | |||||||||
| 3.75" | 1/2" | 3/4" | 3.4" | 1" | 0.58" | UHMW Plastic | Solid | 0000000 | 00000 |
| 4.15" | 1/2" | 1 1/2" | 3.8" | 1" | 0.58" | UHMW Plastic | Solid | 0000000 | 00000 |
| 4.75" | 1/2" | 1 1/2" | 4.4" | 1" | 0.58" | UHMW Plastic | Solid | 0000000 | 00000 |
| 5.15" | 1/2" | 2" | 4.8" | 1" | 0.58" | UHMW Plastic | Solid | 0000000 | 00000 |
Round-Belt Pulleys
Mount these pulleys directly onto a shaft to transmit rotary motion and torque. Commonly used in harsh environments and wet conditions, they are corrosion and abrasion resistant. The bore can be machined to your exact specifications.
For technical drawings and 3-D models, click on a part number.
| For Belt Dia. | OD | For Shaft Dia. | Dia. | Wd. | Groove Dp. | For Max. Shaft Dia. | Material | Each | |
| 1/8" | 1.5" | 1/4" | 1.375" | 3/8" | 0.062" | 1/2" | UHMW Plastic | 0000000 | 000000 |
| 1/4" | 1.5" | 1/4" | 1.22" | 1/2" | 0.14" | 1/2" | UHMW Plastic | 0000000 | 00000 |
| 1/4" | 2" | 1/4" | 1.72" | 1/2" | 0.14" | 1/2" | UHMW Plastic | 0000000 | 00000 |
| 1/4" | 2.5" | 1/4" | 2.22" | 1/2" | 0.14" | 3/4" | UHMW Plastic | 0000000 | 00000 |
| 1/4" | 3" | 1/2" | 2.72" | 1/2" | 0.14" | 3/4" | UHMW Plastic | 0000000 | 00000 |
| 1/4" | 4" | 1/2" | 3.72" | 1/2" | 0.14" | 1" | UHMW Plastic | 0000000 | 00000 |
| 3/8" | 2" | 1/4" | 1.59" | 5/8" | 0.205" | 1/2" | UHMW Plastic | 0000000 | 00000 |
| 3/8" | 3" | 1/4" | 2.59" | 5/8" | 0.205" | 3/4" | UHMW Plastic | 0000000 | 00000 |
| 3/8" | 6" | 1/2" | 5.59" | 5/8" | 0.205" | 2" | UHMW Plastic | 0000000 | 00000 |
| 1/2" | 3" | 1/4" | 2.47" | 3/4" | 0.265" | 3/4" | UHMW Plastic | 0000000 | 00000 |
| 1/2" | 4" | 1/2" | 3.47" | 3/4" | 0.265" | 1" | UHMW Plastic | 0000000 | 00000 |
| 1/2" | 5" | 1/2" | 4.47" | 3/4" | 0.265" | 1 1/2" | UHMW Plastic | 0000000 | 00000 |
| 1/2" | 6" | 1/2" | 5.47" | 3/4" | 0.265" | 2" | UHMW Plastic | 0000000 | 00000 |
| 1/2" | 10" | 1/2" | 9.47" | 3/4" | 0.265" | 3" | UHMW Plastic | 0000000 | 000000 |
| 3/4" | 5" | 1/2" | 4.19" | 1 1/4" | 0.405" | 1 1/2" | UHMW Plastic | 0000000 | 00000 |
Round-Belt Idler Pulleys
These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration. They are often used with belt tensioners (sold separately). Ball bearings are double sealed to keep dirt out.
Brass pulleys are nonsparking and fit in extremely small spaces.
For technical drawings and 3-D models, click on a part number.
| For Belt Dia. | OD | For Shaft Dia. | Dia. | Wd. | Groove Dp. | Material | Bearing Material | Each | |
| 3/32" | 0.8" | 1/8" | 0.654" | 9/64" | 0.048" | Brass | Stainless Steel | 000000 | 000000 |
| 3/32" | 1" | 1/8" | 0.904" | 5/32" | 0.048" | Brass | Stainless Steel | 000000 | 00000 |
| 3/32" | 1.5" | 1/8" | 1.404" | 5/32" | 0.048" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1" | 1/4" | 0.872" | 3/16" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1.5" | 1/4" | 1.372" | 3/16" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1.5" | 1/4" | 1.372" | 13/64" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 2" | 1/4" | 1.872" | 13/64" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 3/16" | 2" | 3/8" | 1.81" | 9/32" | 0.095" | Brass | Stainless Steel | 000000 | 00000 |
| 3/16" | 2.5" | 3/8" | 2.31" | 9/32" | 0.095" | Brass | Stainless Steel | 0000000 | 00000 |