To prevent slippage while moving extra heavy loads, these pulleys mount with quick-disconnect (QD) bushings for a more secure grip on the shaft than set screws and press-fit pulleys. They are XXH (double extra heavy series) with trapezoidal teeth. Made from iron, these pulleys are strong and resistant wear. A black-oxide coating protects them from corrosion in dry environments.

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).

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.

Press-fit mount pulleys come machined to the for shaft diameter size and are machinable up to the for maximum shaft diameter size.

Bushing-mount pulleys grip the shaft more securely than pulleys that press fit. Quick-disconnect (QD) bushings and split-tapered bushings sold separately.

For higher speed or higher torque applications, these GT series timing belt pulleys provide a more precise fit than HTD pulleys. Use them where accuracy is critical, such as in storage and retrieval systems or in robotics. Similar to HTD timing belt pulleys, their teeth are curved for high strength. The curved teeth create positive grip engagement with timing belts, so these pulleys do not require re-tensioning—unlike drives using V-belts or sheaves. And unlike chain drives, there’s no metal-on-metal contact, so these pulleys don’t require lubrication.

Anodized aluminum pulleys are lightweight and resist corrosion. They have a finished bore and come with set screws for mounting on shafts.