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.
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 | Number of Teeth | For Shaft Dia. | Dia. | Wd. | Groove Dp. | Shaft Mount Type | Bore Type | Number of Flanges | Fabrication | Material | Bearing Type | Each | |
For 6 mm Max. Belt Wd. | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gates PowerGrip 2GT | 15mm | 20 | 3mm | 12.22mm | 10mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 00000 |
| Gates PowerGrip 2GT | 15mm | 20 | 5mm | 12.22mm | 10mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
For 9 mm Max. Belt Wd. | ||||||||||||||
| Gates PowerGrip 2GT | 15mm | 20 | 3mm | 12.22mm | 14mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 0000 |
| Gates PowerGrip 2GT | 15mm | 20 | 5mm | 12.22mm | 14mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
For 12 mm Max. Belt Wd. | ||||||||||||||
| Gates PowerGrip 2GT | 15mm | 20 | 3mm | 12.22mm | 16mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 0000 |
| Gates PowerGrip 2GT | 15mm | 20 | 5mm | 12.22mm | 16mm | 1.39 mm | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
| 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 | 3 | 12 | 10 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 00000 |
| Gates PowerGrip 2GT | 15 | 5 | 12 | 10 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
For 9 mm Max. Belt Wd. | |||||||||||||
| Gates PowerGrip 2GT | 15 | 3 | 12 | 14 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 0000 |
| 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 | 3 | 12 | 16 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 00000000 | 0000 |
| Gates PowerGrip 2GT | 15 | 5 | 12 | 16 | 1.5 | Slip Fit | Finished | 2 | Machined | Aluminum | Ball | 0000000 | 0000 |
V-Belt Idler Pulleys
These pulleys spin freely on built-in ball bearings to maintain tension for reduced wear and vibration. Commonly used with belt tensioners (sold separately), they are lightweight and corrosion and abrasion resistant. Bearings are double sealed to keep dirt out.
For technical drawings and 3-D models, click on a part number.
| No. of Grooves | OD | For Shaft Dia. | Pitch Dia. | Wd. | Groove Dp. | Material | Body Type | Each | |
For 4L, A, AX Belts | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3" | 3/8" | 2" | 45/64" | 0.5" | Nylon Plastic | Solid | 0000000 | 000000 |
| 1 | 3" | 1/2" | 2" | 45/64" | 0.5" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 4" | 3/8" | 2.99" | 45/64" | 0.5" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 4" | 1/2" | 2.99" | 45/64" | 0.5" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 6" | 1/2" | 5.12" | 23/32" | 0.46" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 7.5" | 1/2" | 6.6" | 23/32" | 0.45" | Nylon Plastic | Solid | 0000000 | 00000 |
For 5L, B, BX Belts | |||||||||
| 1 | 3.1" | 3/8" | 1.84" | 25/32" | 0.63" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 3.1" | 1/2" | 1.84" | 25/32" | 0.63" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 4" | 3/8" | 2.84" | 55/64" | 0.58" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 4" | 1/2" | 2.84" | 55/64" | 0.58" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 5" | 3/8" | 3.84" | 51/64" | 0.6" | Nylon Plastic | Solid | 0000000 | 00000 |
| 1 | 5" | 1/2" | 3.84" | 51/64" | 0.6" | Nylon Plastic | Solid | 0000000 | 00000 |
| 2 | 6.3" | 1/2" | 5.18" | 1 23/32" | 0.55" | Nylon Plastic | Solid | 00000000 | 000000 |
| 3 | 6.3" | 1/2" | 5.18" | 2 7/16" | 0.55" | Nylon Plastic | Solid | 00000000 | 000000 |
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. Nylon pulleys are lightweight and corrosion and abrasion resistant.
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 | |
| 1/4" | 4.5" | 3/8" | 3.74" | 55/64" | 0.36" | Nylon Plastic | Steel | 00000000 | 000000 |
| 1/4" | 4.5" | 1/2" | 3.74" | 55/64" | 0.36" | Nylon Plastic | Steel | 00000000 | 00000 |
| 1/4" | 6" | 3/8" | 5.2" | 51/64" | 0.4" | Nylon Plastic | Steel | 00000000 | 00000 |
| 1/4" | 6" | 1/2" | 5.2" | 51/64" | 0.4" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 3.1" | 3/8" | 2.45" | 39/64" | 0.3" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 3.1" | 1/2" | 2.45" | 39/64" | 0.3" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 3.5" | 3/8" | 2.75" | 49/64" | 3/8" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 3.5" | 1/2" | 2.75" | 49/64" | 3/8" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 5.5" | 3/8" | 4.62" | 9/16" | 0.44" | Nylon Plastic | Steel | 00000000 | 00000 |
| 3/8" | 5.5" | 1/2" | 4.62" | 9/16" | 0.44" | Nylon Plastic | Steel | 00000000 | 00000 |
| 11/16" | 4.8" | 3/8" | 4" | 1 1/16" | 0.41" | Nylon Plastic | Steel | 00000000 | 00000 |
| 11/16" | 4.8" | 1/2" | 4" | 1 1/16" | 0.41" | Nylon Plastic | Steel | 00000000 | 00000 |
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 |