H Series Timing Belt Pulleys
Pulleys are H series (heavy) and have trapezoidal teeth. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.
For technical drawings and 3-D models, click on a part number.
| OD | Number of Teeth | Pitch | For Shaft Dia. | Bore Type | Inside Wd. | Outside Wd. | Overall Wd. | Pitch Dia. | Number of Flanges | Fabrication | Material | Hub Dia. | Each | |
For 2" Max. Belt Wd. | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.75" | 22 | 0.500" | 1" | Plain | 2.125" | 2.344" | 3.344" | 3.501" | 2 | Sintered | Steel | 2.875" | 00000000 | 0000000 |
| 4.063" | 24 | 0.500" | 1" | Plain | 2.125" | 2.344" | 3.344" | 3.82" | 2 | Sintered | Steel | 3.125" | 00000000 | 000000 |
| 4.369" | 26 | 0.500" | 1" | Plain | 2.125" | 2.344" | 3.469" | 4.138" | 2 | Sintered | Steel | 3.5" | 00000000 | 000000 |
Timing Belt Idler Pulleys
Add these free-spinning pulleys to your timing belt setup to minimize vibration and keep belts from wearing out. The needle bearing at the center of these pulleys is lined with small, cylindrical rollers that reduce friction as they rotate. This bearing allows both the pulley and the shaft it’s mounted on to spin independently. Made from iron or steel, these pulleys are strong and wear-resistant. The black oxide coating protects the pulleys from corrosion in dry environments.
Trapezoidal teeth on the outside of the pulley fit into teeth inside your timing belt—select a pulley that matches your belt trade size. The maximum belt width should be the same size or larger than the width of your timing belt.
For technical drawings and 3-D models, click on a part number.
| For Max. Belt Wd. | OD | Number of Teeth | Teeth Shape | For Shaft Dia. | Pitch | Dia. | Bore Type | Overall Wd. | Pitch Dia. | Fabrication | Material | Bearing Type | Hub Dia. | Each | |
For H Belt Trade Size  | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1" | 2 1/2" | 16 | Trapezoidal | 1" | 0.5" | 2 1/2" | Plain | 1 1/8" | 2.546" | Machined | Black-Oxide Steel | Needle Roller | 1.8" | 0000000 | 000000 |
| 2" | 2 1/2" | 16 | Trapezoidal | 1" | 0.5" | 2 1/2" | Plain | 2 1/8" | 2.546" | Machined | Black-Oxide Steel | Needle Roller | 1.85" | 0000000 | 00000 |
| 3" | 2.8" | 18 | Trapezoidal | 1" | 0.5" | 2 1/2" | Plain | 3 1/8" | 2.865" | Machined | Black-Oxide Iron | Needle Roller | 1 3/4" | 0000000 | 000000 |
For L Belt Trade Size | |||||||||||||||
| 1" | 2.1" | 18 | Trapezoidal | 1" | 0.375" | 2 1/8" | Plain | 1 1/8" | 2.149" | Machined | Black-Oxide Steel | Needle Roller | 1 3/4" | 0000000 | 00000 |
| 1" | 2.6" | 22 | Trapezoidal | 1" | 0.375" | 2 19/32" | Plain | 1 1/8" | 2.626" | Machined | Black-Oxide Steel | Needle Roller | 1 3/4" | 0000000 | 00000 |
XH Series Timing Belt Pulleys
Made of iron, these pulleys are strong enough to carry extra heavy loads. They have trapezoidal teeth. Choose a pulley that matches your shaft diameter—they come machined for a snug fit. A black-oxide coating protects them from corrosion in dry environments.
For technical drawings and 3-D models, click on a part number.
| OD | Number of Teeth | Pitch | For Shaft Dia. | Bore Type | Inside Wd. | Outside Wd. | Overall Wd. | Pitch Dia. | Number of Flanges | Fabrication | Material | Each | |
For 2" Max. Belt Wd. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5.563" | 18 | 0.875" | 1" | Plain | 2.19" | 2.563" | 3.438" | 5.013" | 2 | Machined | Black-Oxide Iron | 0000000 | 0000000 |
| 6.125" | 20 | 0.875" | 1" | Plain | 2.19" | 2.563" | 3.563" | 5.57" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
For 3" Max. Belt Wd. | |||||||||||||
| 5.563" | 18 | 0.875" | 1" | Plain | 3.26" | 3.625" | 4.5" | 5.013" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
| 6.125" | 20 | 0.875" | 1" | Plain | 3.26" | 3.625" | 4.625" | 5.57" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
For 4" Max. Belt Wd. | |||||||||||||
| 5.563" | 18 | 0.875" | 1" | Plain | 4.32" | 4.688" | 5.563" | 5.013" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
| 6.125" | 20 | 0.875" | 1" | Plain | 4.32" | 4.688" | 5.688" | 5.57" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
| 7.25" | 24 | 0.875" | 1" | Plain | 4.32" | 4.688" | 5.938" | 6.685" | 2 | Machined | Black-Oxide Iron | 0000000 | 000000 |
| 7.75" | 26 | 0.875" | 1" | Plain | 4.38" | 4.688" | 5.938" | 7.241" | 2 | Machined | Black-Oxide Iron | 0000000 | 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.
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
For technical drawings and 3-D models, click on a part number.
Keyway | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OD | For Shaft Dia. | Pitch Dia. | Wd. | O'all Wd. | Groove Dp. | Wd. | Dp. | Material | Body Type | Includes | Each | |
For 4L, A Belts | ||||||||||||
| 6" | 1" | 5.75" | 45/64" | 1 11/32" | 0.5" | 1/4" | 1/8" | Zinc | Spoked | One Set Screw | 00000000 | 000000 |
| 7" | 1" | 6.75" | 45/64" | 1 11/32" | 0.5" | 1/4" | 1/8" | Zinc | Spoked | One Set Screw | 00000000 | 00000 |
| 8" | 1" | 7.75" | 45/64" | 1 11/32" | 0.5" | 1/4" | 1/8" | Zinc | Spoked | One Set Screw | 00000000 | 00000 |
| 9" | 1" | 8.75" | 45/64" | 1 11/32" | 0.5" | 1/4" | 1/8" | Zinc | Spoked | One Set Screw | 00000000 | 00000 |
| 10" | 1" | 9.75" | 45/64" | 1 11/32" | 0.5" | 1/4" | 1/8" | Zinc | Spoked | One Set Screw | 00000000 | 00000 |
Heavy Duty V-Belt Pulleys
For technical drawings and 3-D models, click on a part number.
Keyway | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Pitch Dia. (For Belt Trade Size) | Wd. | O'all Wd. | Groove Dp. | Wd. | Dp. | Material | Body Type | Includes | Each | |
2.5" OD | |||||||||||
| 1" | 1.7" (4L, A, AX), 2.1" (5L, B, BX) | 7/8" | 1 9/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 000000 |
3.55" OD | |||||||||||
| 1" | 2.8" (4L, A, AX), 3.2" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
3.75" OD | |||||||||||
| 1" | 3" (4L, A, AX), 3.4" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
3.95" OD | |||||||||||
| 1" | 3.2" (4L, A, AX), 3.6" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
4.15" OD | |||||||||||
| 1" | 3.4" (4L, A, AX), 3.8" (5L, B, BX) | 7/8" | 1 1/2" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
4.25" OD | |||||||||||
| 1" | 3.5" (4L, A, AX), 3.9" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
4.45" OD | |||||||||||
| 1" | 3.7" (4L, A, AX), 4.1" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
4.75" OD | |||||||||||
| 1" | 4" (4L, A, AX), 4.4" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
4.95" OD | |||||||||||
| 1" | 4.2" (4L, A, AX), 4.6" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
5.15" OD | |||||||||||
| 1" | 4.4" (4L, A, AX), 4.8" (5L, B, BX) | 7/8" | 1 5/8" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
5.25" OD | |||||||||||
| 1" | 4.5" (4L, A, AX), 4.9" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
5.45" OD | |||||||||||
| 1" | 4.7" (4L, A, AX), 5.1" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
5.75" OD | |||||||||||
| 1" | 5" (4L, A, AX), 5.4" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
5.95" OD | |||||||||||
| 1" | 5.2" (4L, A, AX), 5.6" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
6.25" OD | |||||||||||
| 1" | 5.5" (4L, A, AX), 5.9" (5L, B, BX) | 7/8" | 1 9/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
6.45" OD | |||||||||||
| 1" | 5.7" (4L, A, AX), 6.1" (5L, B, BX) | 7/8" | 1 5/16" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
6.75" OD | |||||||||||
| 1" | 6" (4L, A, AX), 6.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
6.95" OD | |||||||||||
| 1" | 6.2" (4L, A, AX), 6.6" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
7.45" OD | |||||||||||
| 1" | 6.7" (4L, A, AX), 7.1" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
7.75" OD | |||||||||||
| 1" | 7" (4L, A, AX), 7.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
8.75" OD | |||||||||||
| 1" | 8" (4L, A, AX), 8.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
9.25" OD | |||||||||||
| 1" | 8.5" (4L, A, AX), 8.9" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
9.75" OD | |||||||||||
| 1" | 9" (4L, A, AX), 9.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
10.25" OD | |||||||||||
| 1" | 9.5" (4L, A, AX), 9.9" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
10.75" OD | |||||||||||
| 1" | 10" (4L, A, AX), 10.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 00000 |
11.75" OD | |||||||||||
| 1" | 11" (4L, A, AX), 11.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 000000 |
12.75" OD | |||||||||||
| 1" | 12" (4L, A, AX), 12.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 000000 |
13.75" OD | |||||||||||
| 1" | 13" (4L, A, AX), 13.4" (5L, B, BX) | 7/8" | 1 17/32" | 5/8" | 1/4" | 1/8" | Cast Iron | Spoked | One Set Screw | 00000000 | 000000 |
Keyway | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Pitch Dia. (For Belt Trade Size) | Wd. | O'all Wd. | Groove Dp. | Wd. | Dp. | Material | Body Type | Includes | Each | |
2.35" OD | |||||||||||
| 1" | 2" (5L, B, BX) | 13/16" | 1 1/4" | 1/2" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 000000 |
Adjustable-Pitch V-Belt Pulleys
Increase efficiency, vary speed, and extend the life of your drive by changing the pitch on these pulleys. Turn the sides of the pulley on the threaded hub to increase or decrease the pitch.
For technical drawings and 3-D models, click on a part number.
Keyway | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Grooves | For Shaft Dia. | Pitch Dia. (For Belt Trade Size) | Wd. | O'all Wd. | Wd. | Dp. | Material | Body Type | Includes | Each | |
3.75" OD | |||||||||||
| 1 | 1" | 2.7"-3.5" (3L), 2.9"-3.9" (4L, A, AX), 3"-4" (5L, B, BX) | 9/16"-1" | 1 3/4" | 1/4" | 1/8" | Cast Iron | Solid | Two Set Screws | 00000000 | 000000 |
4.15" OD | |||||||||||
| 1 | 1" | 2.7"-3.5" (3L), 2.8"-3.8" (4L, A, AX), 3.1"-4.1" (5L, B, BX) | 3/4"-1 1/8" | 2 5/32" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 00000 |
4.75" OD | |||||||||||
| 1 | 1" | 3.3"-4.1" (3L), 3.4"-4.4" (4L, A, AX), 3.7"-4.7" (5L, B, BX) | 3/4"-1 1/8" | 2 5/32" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 000000 |
| 2 | 1" | 3.3"-4.1" (3L), 3.4"-4.4" (4L, A, AX), 3.7"-4.7" (5L, B, BX) | 1 3/8"-2 1/8" | 3" | __ | __ | Cast Iron | Solid | One Set Screw | 0000000 | 000000 |
5.35" OD | |||||||||||
| 1 | 1" | 3.9"-4.7" (3L), 4"-5" (4L, A, AX), 4.3"-5.3" (5L, B, BX) | 3/4"-1 1/8" | 2 5/32" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 00000000 | 000000 |
| 2 | 1" | 3.9"-4.7" (3L), 4"-5" (4L, A, AX), 4.3"-5.3" (5L, B, BX) | 1 3/8"-2 1/8" | 3" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 0000000 | 000000 |
Keyway | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Grooves | For Shaft Dia. | Pitch Dia. (For Belt Trade Size) | Wd. | O'all Wd. | Wd. | Dp. | Material | Body Type | Includes | Each | |
5.95" OD | |||||||||||
| 2 | 1" | 4.2"-5.2" (4L, A, AX), 4.5"-5.5" (5L, B, BX) | 1 5/8"-2 3/8" | 3 1/4" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 0000000 | 0000000 |
Constant-Tension V-Belt Pulleys
A built-in spring maintains tension on your belt.
For technical drawings and 3-D models, click on a part number.
Keyway | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OD | For Shaft Dia. | Pitch Dia. | Wd. | O'all Wd. | Wd. | Dp. | Material | Body Type | Includes | Each | |
For 4L, 5L, A, AX, B, BX Belts | |||||||||||
| 5" | 1" | 2.37"-4.84" | 15/16" | 3 5/8" | 1/4" | 1/8" | Cast Iron | Solid | One Set Screw | 0000000 | 0000000 |
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).
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 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 4 1/2" | 7" | 1" | 6" | 5" | 0.5" | Cast Iron | 0000000 | 0000000 |
| 6 1/4" | 7" | 1" | 6" | 6 3/4" | 0.5" | Cast Iron | 0000000 | 000000 |
With Needle Roller Bearings | ||||||||
| 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 |
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 | |
| 3" | 2.5" | 1" | 2.5" | 3 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 0000000 |
| 3" | 3" | 1" | 3" | 3 1/2" | 1/4" | 1/8" | 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 |
| 4" | 4" | 1" | 4" | 4 1/2" | 1/4" | 1/8" | Paper/Fiber Laminate | Two Set Screws | 00000000 | 000000 |