Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your motion system slips, skips, or loses sync, the culprit is often an undersized or mismatched pulley. Engineers, makers, and CNC hobbyists who demand repeatable, backlash-free motion need a timing belt pulley that locks onto the shaft cleanly and meshes with the belt without play. The HTD-3M timing belt pulley series is engineered for exactly that — delivering consistent, slip-free power transfer across a wide range of gear ratios.
These HTD-3M pulleys feature a 3 mm pitch HTD tooth profile machined from aluminum alloy, with a stepped hub design and a belt-contact width of 11 mm. Tooth counts span from 45T to 150T, and bore options range from 5 mm to 25 mm (approximately 0.20 in to 0.98 in), covering the most common shaft diameters used in hobby and light-industrial motion systems. Each pulley includes a set-screw-ready hub for secure shaft retention.
Typical use cases include CNC router X/Y axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, and custom conveyor or indexing mechanisms — anywhere a synchronous belt drive with a 3 mm pitch HTD belt is required.
Available from 45T to 150T, enabling flexible gear ratio selection for speed reduction or torque multiplication in your drive system.
Bore options from 5 mm to 25 mm accommodate the most common shaft diameters used in CNC machines, 3D printers, and robotics platforms.
The integrated step hub provides axial positioning reference and added shaft contact area for more stable, vibration-resistant mounting.
The rounded HTD tooth form distributes belt load across a larger contact area, reducing tooth stress and extending belt life compared to trapezoidal profiles.
Each pulley hub is pre-drilled and tapped for a set screw, allowing tool-free shaft locking and quick repositioning during prototyping or assembly.
Matched to standard 11 mm wide HTD-3M belts, ensuring full tooth engagement across the belt width for consistent torque transmission without edge loading.
| Belt Type | HTD-3M (3 mm pitch, rounded tooth) |
|---|---|
| Tooth Count (Types) | 45T, 46T, 48T, 50T, 55T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T, 120T, 140T, 150T |
| Belt Width Compatibility | 11 mm |
| Bore Diameter Range | 5 mm – 25 mm (see variant options) |
| Hub Style | Stepped hub with set-screw |
| Material | Aluminum alloy |
| Pitch Diameter Range | See variant options |
| Outer Diameter Range | See variant options |
| Quantity per Order | 1 piece |
Select the tooth count based on your desired gear ratio. Divide the driven pulley tooth count by the drive pulley tooth count to get the reduction ratio. For example, pairing a 45T drive pulley with a 90T driven pulley gives a 2:1 speed reduction. Larger tooth counts also increase the pulley's pitch diameter, which affects belt length requirements.
Order the bore size that matches your shaft diameter exactly. Common shaft sizes for CNC and 3D printer applications include 5 mm, 6 mm, 6.35 mm (1/4 in), 8 mm, 10 mm, and 12 mm. If your shaft is metric, select the matching metric bore. For imperial shafts, 6.35 mm corresponds to 1/4 inch and 12.7 mm corresponds to 1/2 inch.
Yes. These pulleys are designed to mesh with standard HTD-3M synchronous timing belts with a 3 mm pitch and 11 mm width. Ensure your belt width matches the 11 mm pulley groove width for full tooth engagement. Do not use with MXL, GT2, or other non-HTD belt profiles, as tooth geometry differs.
The set screw provides adequate retention for typical hobby and light-duty CNC loads when properly torqued against a flat or keyway on the shaft. For high-torque applications, we recommend using a shaft with a machined flat to prevent rotation. Adding a second set screw at 90° (if the hub allows) further improves retention under reversing or shock loads.
These pulleys are machined from aluminum alloy, which offers a good strength-to-weight ratio and natural oxidation resistance suitable for indoor and dry-environment use. For humid or outdoor environments, consider applying a light coat of corrosion-inhibiting lubricant to the bore and hub surfaces. Aluminum is not recommended for highly corrosive chemical environments.
Yes. HTD-3M pulleys are widely used in 3D printer motion systems (particularly CoreXY and Cartesian designs) and CNC router axis drives. Verify that your existing belt is HTD-3M profile and 11 mm wide before ordering. The stepped hub design also makes these suitable for robotic joint actuators and custom indexing tables.
Belt length depends on center distance and the pitch diameters of both pulleys. Use the formula: Belt Length ≈ 2C + π(D1+D2)/2 + (D2−D1)²/(4C), where C is center distance and D1/D2 are pitch diameters. Online HTD belt length calculators can simplify this. When switching to a larger tooth count pulley, you will typically need a longer belt.
