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When a slipping or mismatched pulley causes positioning errors in your CNC router, 3D printer, or automation rig, the entire project stalls. Engineers, makers, and machine builders who demand repeatable, zero-slip motion need a synchronous wheel that holds its tooth engagement under load — and that's exactly what these HTD-3M timing belt pulleys are built for.
Each pulley features an HTD (High Torque Drive) 3mm pitch tooth profile machined to accept standard 3M synchronous belts. The tooth width is 11mm (approximately 0.43 in), and tooth counts span from 15T to 100T — covering pitch diameters from roughly 14.3mm (0.56 in) for the 15T up to approximately 95.5mm (3.76 in) for the 100T. Bore options range from 4mm to 20mm (0.16 in to 0.79 in) to suit a wide variety of motor and shaft sizes. Material is aluminum alloy with a natural anodized or black-anodized finish depending on the selected type variant.
Typical use cases include: stepper motor drive systems in desktop CNC machines and laser cutters where precise axis positioning is critical; extruder and Z-axis assemblies in FDM 3D printers requiring consistent belt tension; and light-duty conveyor or indexing mechanisms in DIY automation projects where a compact 3M pitch drive keeps the footprint small.
| Belt Profile | HTD-3M (High Torque Drive) |
|---|---|
| Pitch | 3mm |
| Tooth Width | 11mm (approx. 0.43 in) |
| Tooth Count (Types) | 15T, 18T, 20T, 25T, 30T, 40T, 50T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T (see variant options) |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 15 / 16 / 17 / 20mm (see variant options) |
| Material | Aluminum alloy |
| Finish | See variant options (natural or black anodized) |
| Pitch Diameter (approx.) | 14.3mm (15T) – 95.5mm (100T) |
| Flange | See variant options |
| Set Screw | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 Pcs or 2 Pcs (see variant options) |
The tooth count determines the pitch diameter and, combined with the tooth count of the mating pulley, sets your drive ratio. Divide the driven pulley's tooth count by the driving pulley's tooth count to get the speed reduction ratio. For example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction. Use a smaller tooth count for higher speed output and a larger tooth count for more torque.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a D-cut shaft, you will need to add a set screw or use a pulley with a matching D-bore — check your motor's datasheet to confirm the shaft diameter and flat depth before ordering.
These pulleys have an 11mm tooth width, which is designed to work with HTD-3M belts that are 10mm or 11mm wide. Using a narrower belt is not recommended as it reduces the load-bearing contact area. A slightly wider belt (e.g., 15mm) can physically fit but may require flanged pulleys to prevent lateral drift.
Yes. Aluminum alloy HTD-3M pulleys are widely used in desktop CNC routers, laser cutters, and 3D printers. The HTD tooth profile handles higher torque than trapezoidal profiles at the same pitch. For heavy-duty industrial applications with continuous high loads, verify the torque rating against your system's peak demand and consider steel pulleys if aluminum does not meet your requirements.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in dry indoor environments. The anodized finish adds an additional protective layer. These pulleys are not recommended for prolonged exposure to moisture, salt spray, or aggressive chemicals. For outdoor or wet environments, consider stainless steel alternatives.
Check your belt's pitch marking — it should read "3M" or "HTD-3M" with a 3mm tooth pitch. Measure the belt width; it should be 10–11mm for a direct fit. Also confirm the belt's inner circumference matches the center distance and pulley diameters in your drive layout. If you are replacing an existing pulley, match the tooth count and bore to the original specification.
Yes — 6.35mm is the metric equivalent of 1/4 inch (0.25 in = 6.35mm exactly), so the 6.35mm bore variant is the correct choice for standard 1/4-inch imperial shafts commonly found in small DC motors and hobby servo systems.
