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When slipping or misaligned pulleys cause positioning errors in your CNC router, 3D printer, or automation rig, the root cause is often an undersized or poorly matched synchronous wheel. Engineers and makers who demand repeatable, zero-slip motion need an HTD-3M timing belt pulley that is machined to spec and ready to mount without rework.
These HTD-3M synchronous wheels feature a 3 mm pitch HTD tooth profile and a 16 mm belt-contact width. Tooth counts span 12 to 30 teeth, covering pitch diameters from approximately 11.5 mm (0.45 in) for 12T up to approximately 28.6 mm (1.13 in) for 30T. Bore options range from 5 mm to 20 mm (0.20 in – 0.79 in), including a 6.35 mm (1/4 in) and 12.7 mm (1/2 in) imperial bore for mixed metric/imperial builds. Each pulley ships with a set-screw collar for secure shaft retention.
Typical use cases include: stepper-motor drive trains in desktop CNC mills and laser cutters requiring HTD-3M belt pulley replacement; extruder and axis drives in FDM 3D printers needing a 3mm pitch synchronous wheel upgrade; and compact servo or BLDC motor gearless reduction stages in robotics and pick-and-place automation where a timing pulley gear ratio change is needed without adding a gearbox.
| Belt Profile | HTD-3M (curvilinear) |
|---|---|
| Pitch | 3 mm |
| Belt Width | 16 mm |
| Tooth Count | 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 24 / 25 / 26 / 28 / 30 Teeth |
| Bore Diameter | 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 mm |
| Pitch Diameter Range | Approx. 11.5 mm (12T) – 28.6 mm (30T) |
| Shaft Retention | Set-screw collar (included) |
| Material | See variant options |
| Flange | See variant options |
| Weight (per piece) | See variant options |
Tooth count determines the pitch diameter and, combined with your belt length and center distance, sets the gear ratio. For a 1:1 drive use identical pulleys on both shafts. To reduce speed (increase torque) use a larger tooth count on the driven shaft. Use an online belt-drive calculator: enter pitch (3 mm), desired center distance, and tooth counts to confirm belt length before ordering.
Common NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm (1/4 in) or 8 mm. Measure your shaft diameter with calipers before selecting a bore. The set-screw collar accommodates minor shaft tolerance variation, but the bore must match the shaft diameter — do not attempt to force a smaller bore onto a larger shaft.
Yes. These pulleys are machined to the HTD-3M tooth profile standard (3 mm pitch, curvilinear tooth form) and are compatible with any HTD-3M timing belt of 16 mm width. They are not interchangeable with MXL, GT2, or T5 profile belts — verify your belt profile before ordering.
Load capacity depends on tooth count, belt tension, and operating speed. The HTD-3M profile distributes stress across the curved tooth root, reducing peak stress versus trapezoidal profiles. For continuous-duty or high-cycle applications, keep belt tension within the belt manufacturer's recommended range and avoid shock loads that exceed the belt's rated tensile strength. Contact us if you need load data for a specific configuration.
Corrosion resistance depends on the pulley material. Please refer to the variant listing or contact us to confirm the material and surface finish for your selected variant. For humid or mildly corrosive environments, consider applying a light machine oil or dry-film lubricant to the bore and set-screw area after installation.
Yes. Pair a small-tooth-count pulley (e.g., 12T) on the motor shaft with a large-tooth-count pulley (e.g., 30T) on the output shaft to achieve a 2.5:1 speed reduction with corresponding torque multiplication. The 16 mm belt width provides adequate torque capacity for most small-robot and pick-and-place applications. Confirm center distance and belt length using a belt-drive calculator before finalising your design.
Both use a 3 mm pitch but have different tooth profiles. HTD-3M uses a circular-arc (curvilinear) tooth form optimised for higher torque and power transmission. GT2 (Gates Tooth) uses a modified curvilinear profile with tighter tolerances, often preferred in precision 3D-printer motion systems. These pulleys are HTD-3M profile only and are not interchangeable with GT2 belts.
