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Engineers and makers who rely on synchronous belt drives know the frustration of mismatched pulleys causing slip, noise, or premature belt wear. These HTD-5M AF-type timing belt pulleys are designed for builders who need dimensionally consistent, drop-in-ready components across a wide range of tooth counts and bore sizes — from compact 3D printer extruder drives to heavy-duty CNC axis systems.
Each pulley features an HTD (High Torque Drive) 5mm pitch tooth profile machined to accept 16mm-wide timing belts. The AF-type hub design includes a set-screw bore for secure shaft mounting. Tooth counts span 10T to 100T, and bore diameters range from 5mm to 25mm (approximately 0.20 in to 0.98 in), covering the most common motor and shaft standards used in motion control applications.
Typical use cases include CNC router and laser cutter axis drives requiring repeatable positioning, robotics joint actuators where backlash-free torque transmission is critical, and 3D printer CoreXY or Cartesian belt drive systems where consistent pulley geometry directly affects print quality.
Available from 10T to 100T, enabling flexible gear ratio design for both high-speed and high-torque drive configurations.
HTD tooth geometry distributes load across multiple teeth, reducing belt stress and extending system service life compared to trapezoidal profiles.
Integrated set-screw bore allows secure, tool-accessible shaft locking without requiring keyways or press-fit tooling.
Groove width machined to accept standard 16mm HTD-5M timing belts, maintaining proper belt tracking and tooth engagement.
Bore diameters from 5mm to 25mm (0.20–0.98 in) accommodate NEMA stepper motor shafts, servo shafts, and custom drive shafts.
Tooth pitch and bore concentricity held to close tolerances to ensure smooth belt engagement and minimal vibration in precision motion systems.
| Belt Type | HTD-5M (High Torque Drive) |
|---|---|
| Pitch | 5mm |
| Belt Width | 16mm |
| Pulley Type | AF-type (set-screw hub) |
| Tooth Count | 10T – 100T (see variant options) |
| Bore Diameter | 5mm – 25mm (see variant options) |
| Bore Diameter (inch) | approx. 0.20 in – 0.98 in |
| Material | See variant options |
| Quantity per Order | 1 piece |
Tooth count determines the pulley pitch diameter and your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the reduction ratio. For CNC and 3D printer applications, common pairings are 20T driving with 40T driven (2:1 reduction) or matched 20T/20T for 1:1 direct drive. Larger tooth counts increase pitch diameter, which affects belt wrap angle and torque capacity.
NEMA 17 stepper motors typically have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, ensure the set screw in the AF-type hub aligns with the flat to prevent rotation under load.
Yes. These pulleys are machined to the HTD-5M tooth profile standard with a 5mm pitch and 16mm groove width. They are compatible with any HTD-5M timing belt rated for 16mm width. Verify belt width before ordering — narrower belts (e.g., 10mm or 15mm) will not seat correctly in the 16mm groove.
The AF-type hub uses one or more set screws to clamp the pulley onto the shaft. For light-to-medium torque applications such as 3D printers, laser cutters, and small CNC routers, this connection is typically sufficient. For high-torque or high-vibration environments, consider using a shaft with a D-cut or keyway to supplement the set-screw grip and prevent rotational slip.
Corrosion resistance depends on the specific material of the variant you select. For applications in humid, wet, or outdoor environments, confirm the material specification before ordering. If corrosion resistance is a primary requirement, contact us to confirm the available material options for your chosen tooth count and bore combination.
Yes. HTD-5M pulleys are widely used in CoreXY, Cartesian, and delta 3D printer motion systems. The 5mm pitch provides a good balance of resolution and torque for typical print head travel speeds. Ensure your belt loop length and idler pulley configuration are compatible with the pitch diameter of the tooth count you select.
HTD (High Torque Drive) uses a rounded, curvilinear tooth profile optimized for high-torque power transmission. GT2 (Gates Tooth) uses a modified curvilinear profile with tighter tolerances, often preferred in precision positioning applications like 3D printers due to lower backlash. These pulleys use the HTD-5M profile and are not interchangeable with GT2-5M belts — always match pulley and belt profiles.
