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When a slipping or mismatched pulley throws off your CNC router, 3D printer, or custom drive system, every axis move becomes unreliable. Engineers, makers, and automation builders who need repeatable, backlash-free motion depend on correctly sized synchronous pulleys matched to their belt pitch and shaft diameter. This XL 10-tooth aluminum timing belt pulley is designed for exactly that — giving you a solid, lightweight drive component that locks onto your shaft and meshes cleanly with standard XL pitch belts.
Each pulley is machined from aluminum alloy, keeping rotating mass low while maintaining the rigidity needed for consistent tooth engagement. The belt-contact width is either 11mm (~0.43 in) or 16mm (~0.63 in) depending on the variant selected, and bore options span 3mm to 8mm (approximately 0.118 in to 0.315 in), covering the most common motor shaft and lead-screw diameters. A set-screw hub secures the pulley to the shaft without requiring a keyway.
Typical use cases include XL belt-driven CNC axis assemblies where a 10-tooth pulley pairs with a larger driven pulley for speed reduction, RepRap-style 3D printer extruder or axis drives requiring a compact synchronous wheel, and lightweight robotics or automation rigs where aluminum construction reduces inertia on stepper or servo motor shafts.
| Belt Pitch | XL — 5.08mm (0.200 in) |
|---|---|
| Number of Teeth | 10T |
| Belt Width (Teeth-Width) | 11mm (~0.43 in) or 16mm (~0.63 in) — See variant options |
| Bore Diameter | 3mm / 3.175mm / 4mm / 5mm / 6mm / 6.35mm / 8mm — See variant options |
| Material | Aluminum alloy |
| Hub Retention | Set-screw |
| Pitch Diameter (approx.) | ~16.2mm (~0.64 in) |
| Outside Diameter (approx.) | ~18mm (~0.71 in) |
| Quantity per Pack | 1 / 2 / 3 / 5 PCS — See variant options |
| Weight (per piece) | See variant options |
This pulley is designed exclusively for XL pitch belts (5.08mm / 0.200 in tooth pitch). Check the label or part number on your existing belt — it should include "XL" in the designation (e.g., 100XL, 150XL). If your belt is GT2, T5, T2.5, or any other pitch, this pulley will not mesh correctly.
Measure your motor or drive shaft diameter with calipers. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4 in); servo motors often use 6mm or 8mm shafts. Select the bore that matches your shaft exactly — a loose fit will cause runout even with the set-screw tightened. If your shaft is imperial (e.g., 1/8 in = 3.175mm or 1/4 in = 6.35mm), those specific bore options are available in this listing.
The number refers to the usable tooth-contact width of the pulley, which must match (or be slightly wider than) your belt's width. An 11mm-wide pulley suits standard narrow XL belts, while the 16mm variant is used with wider XL belts that carry higher loads or require greater lateral stability. Using a pulley narrower than your belt will cause the belt to ride over the flanges and derail.
Aluminum alloy pulleys are well-suited for light-to-medium duty applications such as CNC routers, 3D printers, laser cutters, and small robotics. For heavy industrial drives with high torque, continuous shock loads, or abrasive environments, a steel pulley may be more appropriate. For the vast majority of hobbyist and maker-scale machines, aluminum provides an excellent balance of strength and low rotational inertia.
XL timing belt pulleys of this type typically include flanges on both sides of the tooth profile to guide the belt and prevent lateral drift. Please confirm with the product images for your specific variant, as flange configuration can vary. If your application requires a flangeless pulley for side-by-side belt arrangements, contact us to confirm before ordering.
This pulley uses a round bore with a set-screw for retention. It will fit a D-shaft as long as the bore diameter matches the shaft's outer diameter — the set-screw can be tightened against the flat face of the D-shaft for a more secure grip than on a fully round shaft. Ensure the set-screw aligns with the flat when installing.
If you are building a multi-axis machine (e.g., a 3-axis CNC or a CoreXY 3D printer), ordering a 3-pack or 5-pack in a single variant saves on per-unit cost and ensures all pulleys come from the same production batch for consistent dimensions. Having a spare on hand also reduces downtime if a pulley is damaged during assembly or operation.
