Flat-Belt Idler Pulleys
These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration. They’re often used with belt tensioners (sold separately).
Nylon pulleys are lightweight and corrosion resistant. Steel and cast iron pulleys are more durable than nylon pulleys.
Pulleys with ball bearings ensure proper positioning inside a tube or housing. They’re sealed to block out dust and contaminants better than pulleys with needle roller bearings.
Pulleys with needle roller bearings minimize internal friction.
For technical drawings and 3-D models, click on a part number.
| For Belt Wd. | OD | For Shaft Dia. | Dia. | Wd. | Groove Dp. | Material | Each | |
With Ball Bearings | ||||||||
|---|---|---|---|---|---|---|---|---|
| 5/8" | 3 1/2" | 3/8" | 3" | 1 3/32" | 0.25" | Nylon Plastic | 0000000 | 000000 |
| 5/8" | 3 1/2" | 1/2" | 3" | 1 3/32" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 11/16" | 2 1/2" | 0.635" | 2 1/4" | 7/8" | 0.125" | Cast Iron | 0000000 | 00000 |
| 13/16" | 2.8" | 3/8" | 2 33/64" | 1 7/32" | 0.11" | Nylon Plastic | 0000000 | 00000 |
| 13/16" | 2.8" | 1/2" | 2 33/64" | 1 7/32" | 0.11" | Nylon Plastic | 0000000 | 00000 |
| 13/16" | 3 1/2" | 3/8" | 3" | 1 7/32" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 13/16" | 3 1/2" | 1/2" | 3" | 1 7/32" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 2.4" | 3/8" | 2" | 1 5/32" | 0.18" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 2.4" | 1/2" | 2" | 1 5/32" | 0.18" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 3" | 3/8" | 2 1/2" | 1 5/16" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 3" | 1/2" | 2 1/2" | 1 5/16" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 5.6" | 3/8" | 5 1/32" | 1 19/64" | 0.26" | Nylon Plastic | 0000000 | 00000 |
| 7/8" | 5.6" | 1/2" | 5 1/32" | 1 19/64" | 0.26" | Nylon Plastic | 0000000 | 00000 |
| 29/32" | 4 1/2" | 3/8" | 4" | 1 25/64" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 29/32" | 4 1/2" | 1/2" | 4" | 1 25/64" | 0.25" | Nylon Plastic | 0000000 | 00000 |
| 1 1/16" | 4 1/2" | 0.635" | 4" | 1 7/16" | 0.25" | Cast Iron | 0000000 | 000000 |
| 1 1/8" | 2.1" | 3/8" | 1 7/8" | 1 35/64" | 0.09" | Nylon Plastic | 0000000 | 00000 |
| 1 1/8" | 2.1" | 1/2" | 1 7/8" | 1 35/64" | 0.09" | Nylon Plastic | 0000000 | 00000 |
| 1 1/8" | 3.4" | 3/8" | 2 31/32" | 1 43/64" | 0.2" | Nylon Plastic | 0000000 | 00000 |
| 1 1/8" | 3.4" | 1/2" | 2 31/32" | 1 43/64" | 0.2" | Nylon Plastic | 0000000 | 00000 |
| 2 1/16" | 4 1/2" | 0.635" | 4" | 2 7/16" | 0.25" | Cast Iron | 0000000 | 000000 |
| 3 1/16" | 4 1/2" | 0.635" | 4" | 3 7/16" | 0.25" | Cast Iron | 0000000 | 000000 |
| 4 1/2" | 7" | 1" | 6" | 5" | 0.5" | Cast Iron | 0000000 | 000000 |
| 6 1/4" | 7" | 1" | 6" | 6 3/4" | 0.5" | Cast Iron | 0000000 | 000000 |
With Needle Roller Bearings | ||||||||
| 7/16" | 1.4" | 1/2" | 1 1/8" | 5/8" | 0.125" | Steel | 000000 | 00000 |
| 9/16" | 1.8" | 1/2" | 1 3/8" | 13/16" | 0.187" | Steel | 000000 | 00000 |
| 11/16" | 2 1/2" | 1" | 2 1/4" | 7/8" | 0.125" | Steel | 000000 | 00000 |
| 1 1/16" | 4 1/2" | 1" | 4" | 1 7/16" | 0.25" | Cast Iron | 000000 | 00000 |
| 2 1/16" | 4 1/2" | 1" | 4" | 2 7/16" | 0.25" | Cast Iron | 000000 | 000000 |
| 3 1/16" | 4 1/2" | 1" | 4" | 3 7/16" | 0.25" | Cast Iron | 000000 | 000000 |
| 4 1/2" | 7" | 1 1/2" | 6" | 5" | 0.5" | Cast Iron | 0000000 | 000000 |
Flat-Belt Pulleys
Also known as paper-plant pulleys, these are made of a paper-fiber composite that minimizes belt slippage and wear.
For technical drawings and 3-D models, click on a part number.
Keyway | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Belt Wd. | OD | For Shaft Dia. | Dia. | Wd. | Wd. | Dp. | Material | Includes | Each | |
| 1" | 2" | 1/2" | 2" | 1 1/2" | 1/8" | 1/16" | Paper/Fiber Laminate | One Set Screw | 00000000 | 000000 |
| 1" | 2" | 5/8" | 2" | 1 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | One Set Screw | 00000000 | 00000 |
| 1" | 2" | 3/4" | 2" | 1 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | One Set Screw | 00000000 | 00000 |
| 1 1/2" | 2" | 1/2" | 2" | 2" | 1/8" | 1/16" | Paper/Fiber Laminate | One Set Screw | 00000000 | 00000 |
| 1 1/2" | 2" | 5/8" | 2" | 2" | 3/16" | 3/32" | Paper/Fiber Laminate | One Set Screw | 00000000 | 00000 |
| 1 1/2" | 2" | 3/4" | 2" | 2" | 3/16" | 3/32" | Paper/Fiber Laminate | One Set Screw | 00000000 | 00000 |
| 2 1/2" | 2" | 1/2" | 2" | 3" | 1/8" | 1/16" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 00000 |
| 2 1/2" | 2" | 5/8" | 2" | 3" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 00000 |
| 2 1/2" | 2" | 3/4" | 2" | 3" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 00000 |
| 3" | 2.5" | 3/4" | 2.5" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 2.5" | 7/8" | 2.5" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 2.5" | 1" | 2.5" | 3 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3" | 3/4" | 3" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3" | 7/8" | 3" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3" | 1" | 3" | 3 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3.5" | 3/4" | 3.5" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3.5" | 7/8" | 3.5" | 3 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3.5" | 1" | 3.5" | 3 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3.5" | 1 1/4" | 3.5" | 3 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 3" | 3.5" | 1 1/2" | 3.5" | 3 1/2" | 3/8" | 3/16" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 4" | 4" | 3/4" | 4" | 4 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 4" | 4" | 7/8" | 4" | 4 1/2" | 3/16" | 3/32" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 4" | 4" | 1" | 4" | 4 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 4" | 4" | 1 1/4" | 4" | 4 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
| 4" | 4" | 1 1/2" | 4" | 4 1/2" | 3/8" | 3/16" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |
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.
Smooth pulleys have no teeth; they're used with the smooth side of the belt.
For technical drawings and 3-D models, click on a part number.
| Manufacturer Series | OD, mm | For Shaft Dia., mm | Dia., mm | Wd., mm | Groove Dp., mm | Shaft Mount Type | Bore Type | Number of Flanges | Fabrication | Material | Bearing Type | Each | |
For 6 mm Max. Belt Wd. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gates PowerGrip 2GT | 15 | 5 | 12 | 10 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 00000 |
For 9 mm Max. Belt Wd. | |||||||||||||
| Gates PowerGrip 2GT | 15 | 5 | 12 | 14 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
For 12 mm Max. Belt Wd. | |||||||||||||
| Gates PowerGrip 2GT | 15 | 5 | 12 | 16 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |