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When your motion control project demands accurate, slip-free power transmission, a mismatched or worn pulley becomes the weakest link in the entire drivetrain. Engineers, makers, and machine builders working on CNC routers, 3D printers, laser cutters, and robotic arms need a timing belt pulley that holds tight tolerances and fits their shaft without play. This HTD-5M timing belt pulley is engineered for exactly those applications.
Each pulley is machined from aluminum alloy with a natural or anodized finish, featuring an HTD (High Torque Drive) 5mm pitch tooth profile. Tooth widths are available in 16mm (~0.63 in) and 21mm (~0.83 in), with tooth counts ranging from 12T to 60T. Bore diameters span 5mm to 20mm (approximately 0.20 in to 0.79 in), covering the most common motor and shaft sizes used in DIY and light industrial builds.
Typical use cases include CNC axis drives requiring repeatable positioning, 3D printer extruder and gantry systems needing low-backlash motion, and conveyor or indexing mechanisms in light automation setups. The HTD-5M profile is also widely used in robotics joint actuators and camera slider rigs where smooth, consistent belt engagement is critical.
The rounded HTD tooth form distributes load across a larger contact area than trapezoidal profiles, reducing belt wear and improving torque capacity at moderate speeds.
From compact 12-tooth pulleys for tight drive ratios to 60-tooth wheels for high-speed, low-torque output — select the exact gear ratio your design requires.
Match your belt width precisely. The 16mm width suits compact builds; the 21mm width provides greater belt contact area for higher torque applications.
Available in 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15, 16, 17, and 20mm bores to fit NEMA stepper motors, servo shafts, and standard metric/imperial shafts directly.
Lightweight yet rigid aluminum body keeps rotational inertia low — important for high-acceleration CNC and robotics applications where motor response matters.
Each pulley includes a set screw hub for secure shaft mounting. Flat-ground shafts or keyway shafts are recommended for maximum torque transfer without slipping.
| Belt Type | HTD-5M (High Torque Drive, 5mm pitch) |
|---|---|
| Tooth Pitch | 5mm (0.197 in) |
| Number of Teeth | 12T, 15T, 20T, 25T, 30T, 40T, 50T, 60T — See variant options |
| Tooth Width | 16mm (~0.63 in) or 21mm (~0.83 in) — See variant options |
| Bore Diameter | 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15, 16, 17, 20mm — See variant options |
| Material | Aluminum alloy |
| Finish | Natural / anodized (may vary by size) |
| Hub Retention | Set screw |
| Quantity | 1 piece per order |
| Compatible Belt | HTD-5M timing belt (5mm pitch) |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For example, a 12T drive pulley paired with a 60T driven pulley gives a 5:1 reduction. Smaller tooth counts on the motor side increase torque; larger counts increase speed. For CNC and 3D printers, 20T is a common starting point for NEMA 17 motors.
The tooth width must match your HTD-5M belt width. A 16mm-wide pulley is used with 15mm belts (standard for compact CNC and 3D printers), while a 21mm-wide pulley pairs with 20mm belts for higher torque capacity. Using a mismatched width will cause the belt to track off-center and wear prematurely.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a D-cut shaft, ensure the set screw aligns with the flat for a secure grip. For NEMA 23 motors, the shaft is typically 6.35mm (1/4 inch) — select the 6.35mm bore option.
These aluminum HTD-5M pulleys are well-suited for light to moderate torque applications such as CNC routers, 3D printers, laser engravers, and small robotic joints. The HTD tooth profile handles higher torque than standard MXL or GT2 profiles of the same pitch. For heavy industrial loads exceeding the aluminum's limits, steel pulleys would be more appropriate.
Aluminum alloy does not rust. It may develop a thin oxide layer over time, which actually acts as a natural protective barrier. For environments with exposure to moisture, salt, or chemicals, an anodized finish provides additional corrosion resistance. These pulleys are not recommended for submerged or highly corrosive environments without additional sealing.
No. These pulleys are specifically designed for HTD-5M belts with a 5mm pitch and rounded tooth profile. GT2 belts use a different tooth geometry (2mm pitch, trapezoidal) and are not interchangeable. Using the wrong belt profile will result in poor engagement, noise, and accelerated wear on both the belt and pulley.
The bore is pre-machined to the diameter shown in the variant option. No additional machining is required for standard round shafts. If your shaft has a keyway, you will need to have a keyway broached into the bore by a machine shop. For D-cut shafts, the set screw provides adequate retention in most light-duty applications.
Most belt drive systems require at least two pulleys — one on the motor shaft and one on the driven shaft. If you are building a new system, order at least two pulleys with the appropriate tooth counts for your desired drive ratio. For replacement or spare parts, a single piece is sufficient. Quantity options are available in the variant selector above.
