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Sourcing an HTD 3M timing belt pulley that fits your exact shaft size without custom machining is a recurring challenge for 3D printer builders, CNC hobbyists, and automation engineers. This aluminum HTD 3M timing belt pulley with step bore covers bore diameters from 4 mm to 25 mm and tooth counts from 20T to 120T, giving you a direct drop-in solution for the most common 3M belt drive configurations.
Each pulley is CNC-machined from aluminum alloy. The step-bore design provides a pre-machined bore that accepts shafts from 4 mm (0.16 in) to 25 mm (0.98 in) across the variant range. Tooth counts span 20T through 120T, and all variants are sized for 15 mm (0.59 in) wide HTD 3M belts. The HTD 3M pitch (3 mm, rounded tooth profile) delivers smooth, low-noise power transmission with minimal backlash.
Typical applications include X/Y axis drives in FDM 3D printers and laser cutters, stepper motor output pulleys in CNC routers and pick-and-place machines, and compact robotic joint drives where an aluminum HTD 3M pulley with a wide bore selection is required to match varied motor shaft diameters.
| Belt Profile | HTD 3M |
|---|---|
| Pitch | 3 mm |
| Tooth Count | 20T – 120T (see variant options) |
| Bore Diameter | 4 mm – 25 mm (see variant options) |
| Applicable Belt Width | 15 mm |
| Material | Aluminum alloy |
| Bore Type | Step bore (pre-machined) |
| Weight | See variant options |
| Surface Finish | Natural anodized / machined |
Measure your motor or idler shaft diameter with a caliper. Choose the bore option that matches your shaft exactly. The step-bore design is pre-machined — no further boring is required. Available bores range from 4 mm to 25 mm across the variant range.
Tooth count determines the pitch diameter and the drive ratio between your motor and driven axis. A smaller tooth count (e.g., 20T) gives a smaller pulley diameter and higher belt speed per motor revolution. A larger tooth count (e.g., 120T) gives a larger diameter and is typically used on the driven side for speed reduction. Match your tooth count to your drive geometry and desired ratio.
No. This pulley is designed for the HTD 3M tooth profile (3 mm pitch, rounded tooth form). It is not interchangeable with GT2 (2 mm pitch) or T3 (trapezoidal 3 mm pitch) belts. Using a mismatched belt profile will result in poor engagement, noise, and accelerated wear.
Aluminum alloy is well-suited for the torque and speed levels typical of desktop CNC routers, 3D printers, and light automation equipment. For sustained high-torque or shock-load industrial applications, contact us to confirm suitability before ordering.
The aluminum alloy body develops a natural oxide layer that provides moderate corrosion resistance in typical indoor workshop conditions. For prolonged exposure to moisture or chemicals, a light protective coating is recommended. The pulley is not rated for immersion or outdoor salt-spray environments.
All variants in this listing are sized for 15 mm wide HTD 3M belts. Using a narrower or wider belt will cause the belt to sit incorrectly on the pulley face, leading to tracking problems and reduced load capacity. If you need a different belt width, contact us to confirm availability.
HTD (High Torque Drive) 3M pulleys use a rounded tooth profile designed to reduce stress concentration and improve load distribution compared to trapezoidal (MXL, T-series) profiles at the same pitch. This results in smoother operation and longer belt life under moderate loads.
