Trapezoidal Timing Pulleys

Trapezoidal timing pulleys use the original straight sided tooth profile and remain the standard for instrumentation, office equipment, 3D printers, robotics, and light industrial synchronous drives. This collection stocks more than 2,800 pulleys across imperial pitches MXL (0.080 in), LT, XL (0.200 in), L (0.375 in), H (0.500 in), XH, and XXH, plus metric T5, T10, AT5, and AT10 profiles.

Tooth counts run 10 to 192, with outside diameters from under 1/4 in to over 37 in. Materials include clear anodized aluminum, polycarbonate, steel, ductile iron, and cast iron, with finished inch and metric bores, minimum plain bores, and Taper-Lock® bushed styles on larger sizes. Construction type diagrams on each product page show exactly which dimension is which.

Frequently Asked Questions

Which trapezoidal pitch do I need?

Match the belt. MXL (0.080 in) is the miniature pitch for instruments and small mechanisms. XL (0.200 in) covers light duty drives like 3D printers and office equipment. L (0.375 in) and H (0.500 in) handle fractional to mid horsepower industrial drives. XH and XXH are heavy pitches for high load, low speed machinery.

What does the part number on a trapezoidal pulley mean?

The number encodes teeth, pitch, and belt width, followed by construction, material, and bore codes. For example, 22MP025 means 22 teeth, MXL pulley, for 1/4 in wide belts. Each product page decodes its own number in the FAQ.

Are aluminum or steel timing pulleys better?

Aluminum is lighter, runs quieter, and is the default for instrument and light industrial drives. Steel and iron handle higher torque and abrasive environments. Polycarbonate suits weight critical and corrosion sensitive applications at low loads. The belt, not the pulley material, is usually the load limit in light drives.