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.

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.