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When your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn timing pulley. Engineers, robotics builders, and DIY makers who demand repeatable, slip-free motion need a synchronous wheel they can trust across a wide range of shaft sizes and tooth counts — without sourcing from multiple suppliers.
These XL-pitch timing belt pulleys are machined from aluminum alloy with a natural or anodized finish. The XL tooth profile (5.080 mm / 0.200 in pitch) is the industry-standard for light-to-medium duty synchronous drives. Tooth counts span 10T through 40T, tooth widths are available in 11 mm (0.43 in) or 16 mm (0.63 in), and bore diameters range from 3 mm to 25 mm (0.118 in – 0.984 in) to suit metric and imperial shafts alike.
Typical use cases include XL belt drive systems for CNC router X/Y axes, stepper-motor driven extruder geartrains in FDM 3D printers, and lightweight robotic arm joint drives where a low-backlash synchronous wheel is required. The broad tooth-count selection also makes these pulleys suitable for gear-ratio tuning in custom timing belt transmission designs.
Available from 10T to 40T, enabling flexible gear-ratio selection for speed reduction or torque multiplication in synchronous drive systems.
Choose 11 mm or 16 mm tooth width to match your XL belt width, ensuring full tooth engagement and even load distribution.
Bore diameters from 3 mm to 25 mm cover common metric and imperial shaft sizes (3 / 3.175 / 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 22 / 25 mm).
Lightweight yet rigid aluminum body keeps rotational inertia low — ideal for servo and stepper motor applications where rapid direction changes are frequent.
5.080 mm (0.200 in) XL tooth pitch is universally compatible with off-the-shelf XL timing belts, simplifying sourcing and replacement.
Hub includes a set-screw flat or through-hole for secure shaft fixation — no additional machining required for most standard shaft diameters.
| Belt Pitch | XL — 5.080 mm (0.200 in) |
|---|---|
| Tooth Count (Types) | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 40T |
| Tooth Width | 11 mm or 16 mm (see variant options) |
| Bore Diameter | 3 – 25 mm (see variant options) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Pitch Diameter | See variant options |
| Flange | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with the mating pulley's tooth count, 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 10T driver paired with a 20T driven pulley gives a 2:1 reduction. Select tooth counts that achieve your target ratio while keeping the center distance practical for your belt length.
Match the tooth width to your XL timing belt width. An 11 mm pulley is used with 3/8 in (9.5 mm) or 1/2 in (12.7 mm) wide XL belts where the belt rides within the flanges, while a 16 mm pulley suits wider XL belts up to approximately 5/8 in (15.9 mm). Using a pulley narrower than your belt will cause the belt to overhang and wear unevenly.
Measure your motor or drive shaft diameter with a caliper. Choose the bore that matches exactly — a bore that is too large will cause runout and vibration even with a set screw. Common stepper motor shaft sizes are 5 mm and 6.35 mm (1/4 in); servo motors often use 6 mm or 8 mm shafts. If your shaft is between listed sizes, select the next larger bore and use a shaft collar or keyway adapter.
Yes. The XL tooth profile (5.080 mm pitch, 50° included angle) is an industry-standard defined by the Rubber Manufacturers Association (RMA). These pulleys are dimensionally compatible with any XL-pitch timing belt of the matching width, regardless of brand, as long as the belt width does not exceed the pulley's tooth width.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives typical in CNC routers, 3D printers, and robotics. They offer a favorable strength-to-weight ratio and resist corrosion without surface treatment. For heavy industrial loads or high-torque applications exceeding the aluminum's yield strength, steel pulleys would be more appropriate. For most maker and automation projects, aluminum is the standard choice.
These pulleys use a set-screw (grub screw) for shaft fixation, which is sufficient for most light-to-medium duty applications. A keyway is not included. If your application involves high torque reversals or shock loads, consider adding a flat on the shaft to improve the set-screw's grip, or consult a mechanical engineer for a keyed solution.
Yes — XL-pitch timing belt pulleys are widely used in DIY CNC routers, laser cutters, and FDM 3D printers. For typical CoreXY or Cartesian 3D printer motion systems, 20T pulleys with a 5 mm bore are a common choice. For CNC router rack-and-pinion or belt-drive axes, higher tooth counts (25T–40T) are often selected to balance speed and torque. Confirm your belt pitch is XL (5.080 mm) before ordering, as GT2 (2 mm pitch) pulleys are not interchangeable.
