HTD-5M 10T-60T Timing Belt Pulley AF-Type Bore 5-25mm, For 15mm Width Belt

The tooth count determines the pitch diameter and, combined with your motor's tooth count, sets the drive ratio. For a 1:1 drive use matching pulleys on both ends. To reduce speed and increase torque, use a larger tooth count on the driven shaft. For CNC routers, 20T is a common starting point; for compact 3D printer extruders, 16T or 20T are typical. Calculate pitch diameter as: PD = (Tooth Count × 5 mm) ÷ π.

Measure your motor shaft diameter with calipers before ordering. Common stepper motor shafts are 5 mm (NEMA 17), 6.35 mm (1/4 in, common on NEMA 23), and 8 mm (larger NEMA 23/34). Servo motors often use 8 mm, 10 mm, or 12 mm shafts. The AF-type bore is a plain through-bore — you will need a set screw, shaft collar, or interference fit to secure the pulley axially. If your shaft has a flat (D-cut), select the matching bore and use a set screw against the flat.

Yes. This pulley uses the HTD-5M tooth profile (5 mm pitch, rounded tooth form) and is designed for use with HTD-5M timing belts. The 16 mm tooth width is matched to 15 mm wide HTD-5M belts, which is the most widely available width for this pitch. Do not use with MXL, GT2, or T5 belts — the tooth profiles are not interchangeable.

The HTD (High Torque Drive) tooth profile uses a rounded, curvilinear tooth form that increases the contact area between belt and pulley compared to trapezoidal profiles. This distributes load more evenly and reduces the risk of tooth shear under moderate-to-high torque conditions. HTD-5M is well-suited for CNC axis drives, conveyor systems, and robotics joints where consistent torque transmission matters more than ultra-low backlash (for near-zero backlash, consider GT2/GT3 profiles instead).

Corrosion resistance depends on the pulley material and finish. For specific material and coating details for this listing, please refer to the variant options or contact us to confirm. In general, aluminum pulleys with anodizing offer good corrosion resistance for indoor workshop use, while steel pulleys may require periodic lubrication or a protective coating in humid environments.

Yes. HTD-5M pulleys are commonly used in larger-format 3D printers (CoreXY, Cartesian), laser cutters, and CNC routers where the 5 mm pitch provides a good balance of resolution and torque capacity. For compact desktop 3D printers using GT2 belts, note that GT2 and HTD-5M are not interchangeable — confirm your belt pitch before ordering. The 20T bore 8mm and 20T bore 5mm variants are among the most popular for motion system builds.

AF-type (also called plain bore or through-bore) means the pulley has a smooth cylindrical hole through the hub with no keyway or pre-machined flat. This gives you flexibility to fit any shaft diameter within the listed range and secure it with a set screw, shaft collar, or press fit. Other bore types include keyed bores (with a machined keyway slot for a Woodruff or parallel key) and D-bore (with a flat). If your shaft has a keyway, you would need a keyed-bore pulley instead.