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When a slipping or mismatched pulley causes your CNC router to lose steps, your 3D printer to skip layers, or your conveyor to drift out of sync, the root cause is almost always an incompatible pitch or bore. These HTD-3M timing belt pulleys are engineered for engineers, makers, and machine builders who need a reliable, drop-in synchronous drive component without guesswork.
Each pulley features an HTD (High Torque Drive) 3mm pitch tooth profile with an 11mm tooth width, available in tooth counts from 12T to 150T and bore diameters from 4mm to 25mm (approximately 0.16" to 0.98"). The body is typically machined from aluminum alloy with a natural or anodized finish, keeping rotating mass low while maintaining dimensional accuracy.
Typical use cases include CNC router X/Y axis drives, desktop 3D printer extruder and motion systems, robotic arm joint actuators, and light-duty conveyor or indexing table drives — all applications where consistent tooth engagement and repeatable positioning are non-negotiable.
| Belt Pitch | 3mm (HTD-3M) |
|---|---|
| Tooth Width | 11mm |
| Tooth Count Range | 12T – 150T |
| Bore Diameter Range | 4mm – 25mm (approx. 0.16" – 0.98") |
| Material | Aluminum alloy |
| Finish | See variant options |
| Flange | See variant options |
| Set Screw | Typically included (M3 or M4) |
| Compatible Belt | HTD-3M timing belt, 9–15mm width |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley tooth count by the drive pulley tooth count to get the reduction ratio. For example, a 15T drive and 60T driven pulley gives a 4:1 reduction. For CNC and 3D printer motion axes, 20T is a common starting point for NEMA 17 motors with standard GT2/HTD-3M belts.
NEMA 17 stepper motors typically 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. NEMA 23 motors commonly use a 6.35mm (1/4") shaft — select the 6.35mm bore option.
No. These pulleys use the HTD-3M tooth profile, which has a rounded tooth shape designed for higher torque loads. GT2 belts use a different tooth geometry and are not interchangeable with HTD-3M pulleys. Always match your belt profile (HTD-3M) and pitch (3mm) to the pulley specification.
The "-B" suffix typically indicates a flanged variant, where one or both sides of the pulley have a raised flange to prevent the belt from walking off the pulley during operation. Flanged versions are recommended for applications with lateral belt forces or where belt tracking is critical.
Aluminum HTD-3M pulleys are suitable for light-to-medium duty applications such as 3D printers, CNC routers, and small robotics. For heavy industrial loads or continuous high-torque environments, verify the torque rating against your system requirements. Larger tooth counts distribute load over more teeth, improving torque capacity.
Most variants are ready to install as-received. The bore is pre-machined to the selected diameter and the set-screw hole is pre-tapped. No additional machining is required for standard round shafts. If your shaft has a keyway, confirm whether a keyway-compatible variant is needed for your specific tooth count and bore combination.
Yes. HTD-3M pulleys are widely used in CoreXY, Cartesian, and delta 3D printer motion systems. Common configurations use 20T drive pulleys on stepper motors paired with idler pulleys. Select the bore that matches your motor shaft and confirm the tooth width (11mm) is compatible with your belt width.
