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When a slipping or misaligned pulley derails your build mid-project, the frustration is real. Whether you're a 3D printer builder, CNC hobbyist, or robotics engineer, you need a timing pulley that locks onto your shaft cleanly and meshes with your belt without backlash. This MXL synchronous timing pulley series is engineered for exactly that — reliable, repeatable motion in compact drive systems.
Each pulley is machined from aluminum alloy with a natural silver finish. The stepped hub design accommodates 6mm wide MXL belts, with a flanged tooth profile to keep the belt tracking true. Tooth counts range from 23T to 100T, bore diameters span 4mm to 16mm (approximately 0.16" to 0.63"), and tooth width is a consistent 7mm (~0.28"). The stepped bore hub adds structural rigidity and simplifies shaft alignment during assembly.
Typical use cases include: open-loop stepper motor drives in desktop 3D printers (X/Y axis), lightweight CNC router axis drives requiring low-backlash synchronous motion, and custom robotic arm joints or conveyor systems where a compact MXL timing pulley with a precise bore-to-shaft fit is critical.
Available from 23T to 100T, giving you the gear ratio flexibility needed for both high-speed and high-torque drive configurations.
The integrated step on the hub provides a positive belt-edge stop, keeping your 6mm MXL belt centered and preventing lateral drift during operation.
Bore diameters from 4mm to 16mm (including 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm) to match common motor and shaft standards.
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — ideal for responsive, dynamic motion systems like 3D printer axes and robotic joints.
The MXL (2.032mm pitch) tooth profile delivers smooth, low-noise synchronous power transmission with minimal belt wear over extended duty cycles.
Drop-in compatible with NEMA 17 stepper motor shafts (5mm bore) and common metric shaft sizes — no machining required for standard bore selections.
| Belt Profile | MXL (2.032mm pitch) |
|---|---|
| Tooth Count | 23T – 100T (see variant options) |
| Tooth Width | 7mm (~0.28") |
| Bore Diameter | 4mm – 16mm (see variant options) |
| Belt Width Compatibility | 6mm |
| Hub Style | Stepped (flanged) |
| Material | Aluminum alloy |
| Finish | Natural / silver anodized |
| Set Screw | See variant options |
| Outer Diameter | See variant options |
| Overall Hub Length | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For example, a 60T driven pulley paired with a 30T driving pulley gives a 2:1 reduction. For 3D printer X/Y axes, 20T–40T pulleys are common on the motor side. Select a higher tooth count for more torque at lower speed, or a lower count for higher speed.
NEMA 17 stepper motors typically have a 5mm diameter output shaft. Select the 5mm bore variant for a direct fit. If your motor has a flat (D-cut) shaft, you will need to add a set screw after installation to lock the pulley in place — check whether your chosen variant includes a set screw or order one separately.
No. This pulley uses the MXL tooth profile with a 2.032mm pitch. It is not interchangeable with GT2 (2mm pitch, different tooth form) or HTD profiles. Always match the pulley profile to your belt profile exactly to avoid skipping and premature wear.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives such as 3D printers, CNC routers, and small robotic systems. For heavy industrial loads or high-shock environments, consider steel pulleys instead. Under normal operating conditions with proper belt tension, aluminum MXL pulleys provide long service life.
Aluminum alloy naturally forms a thin oxide layer that protects against further corrosion in typical indoor environments. For outdoor or high-humidity applications, an anodized finish provides additional protection. These pulleys are not recommended for direct immersion in water or exposure to strong acids or alkalis.
Measure your motor or drive shaft diameter with a caliper. Common sizes include 5mm (NEMA 17 stepper), 6mm (many DC motors), 6.35mm (1/4" imperial shafts), 8mm, 10mm, 12mm, and 12.7mm (1/2" imperial). Select the bore that matches your shaft exactly — a loose bore will cause runout and vibration, while an undersized bore cannot be installed without machining.
This pulley is designed specifically for 6mm wide MXL belts. The stepped hub flanges are positioned to guide a 6mm belt. Using a narrower belt may result in poor tracking, while a wider belt will not seat correctly between the flanges. For other belt widths, please contact us to confirm compatibility.
