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When your build demands exact synchronization and zero slip, a mismatched or worn pulley becomes the weakest link in the entire drivetrain. Whether you are a maker upgrading a 3D printer, an engineer designing a conveyor, or a hobbyist building a CNC router, the HTD-5M timing belt pulley gives you the dimensional accuracy and bore flexibility to get the job done right the first time.
These HTD-5M timing belt pulleys feature a 5mm pitch HTD tooth profile and a fixed belt width of 21mm (approximately 0.83 in). The AF-type flange design keeps the belt tracking securely on the pulley face. Available tooth counts range from 10T to 40T, with bore options spanning 4mm to 28mm (approximately 0.16 in to 1.10 in) to suit a wide variety of shaft sizes. Each pulley is CNC machined for consistent tooth geometry and concentricity.
Typical applications include desktop 3D printer X/Y axis drives, DIY CNC router spindle feeds, robotic arm joint actuators, light-duty conveyor belt systems, and stepper-motor-driven automation rigs where precise HTD-5M belt-and-pulley synchronization is required.
| Belt Type | HTD-5M |
|---|---|
| Tooth Pitch | 5mm (0.197 in) |
| Tooth Count | 10T – 40T (see variant options) |
| Belt Width (Working) | 21mm (0.83 in) |
| Bore Diameter | 4mm – 28mm (see variant options) |
| Pulley Type | AF-Type (double-flanged) |
| Drive Style | Synchronous / Timing |
| Material | See variant options |
| Finish / Colour | See variant options |
| Outer Diameter | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pulley's pitch diameter and, combined with your motor pulley, sets the drive ratio. A smaller tooth count (e.g., 10T–15T) on the motor side paired with a larger count on the driven side reduces speed and increases torque. For 3D printers and CNC routers, 20T is a common motor-side choice. Match the tooth count to your belt length and center distance calculations for best results.
Standard NEMA 17 stepper motors typically have a 5mm output shaft. Select the 5mm bore variant. If your motor has a flat-cut (D-shaft), you will need to add a set screw or use a shaft coupler — the bore itself is round. For NEMA 23 motors, the common shaft diameter is 6.35mm (1/4 in) or 8mm depending on the model.
Yes — these pulleys are designed to the standard HTD-5M tooth profile (5mm pitch, HTD curve geometry) and are compatible with any HTD-5M timing belt of 21mm width. Ensure your belt width matches the 21mm working width of the pulley. Using a narrower belt is possible but reduces load capacity; a wider belt will not seat correctly between the flanges.
Load capacity depends on the material, tooth count, belt tension, and operating speed. These pulleys are CNC machined for consistent geometry, which directly supports reliable torque transfer. For light-to-medium duty applications such as 3D printers, small CNC machines, and robotics, the HTD-5M system is well-proven. For heavy industrial loads, confirm the material specification of your selected variant and consult standard HTD belt load tables.
Corrosion resistance depends on the material of the specific variant you select. Check the variant options for material details. For environments with moisture or mild chemicals, an anodized aluminum variant (where available) offers good corrosion resistance. If operating in a harsh environment, consider adding a light machine oil coating to the bore and shaft interface.
No. HTD-5M and GT2 (2mm pitch) are different tooth profiles and are not interchangeable. The HTD-5M profile has a rounded, deeper tooth form designed for higher torque applications, while GT2 is optimized for low-backlash positioning. Always match the pulley tooth profile and pitch to your belt exactly.
AF-type refers to the flange configuration — both sides of the pulley have flanges (raised edges) that keep the belt from slipping off laterally. This is the most common configuration for open-loop and closed-loop belt drives. Some applications use single-flange (F-type) or no-flange pulleys when the belt is guided by other means, but AF-type is the safest choice for most DIY and light industrial builds.
