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When your motion control project demands repeatable, slip-free power transmission, a mismatched or worn pulley becomes the weakest link in the chain. Whether you are a CNC hobbyist, a robotics engineer, or a machine builder, these XL timing belt pulleys with 5.08mm pitch give you the dimensional accuracy and keyway security needed to keep your drive system running true.
Each pulley is machined from aluminum alloy and features an AF-type through-bore with a precision-cut keyway. Teeth width is a fixed 14mm, matching standard XL-profile belts. Bore options range from 8mm to 20mm (approximately 0.31 in to 0.79 in), and tooth counts span XL10T through XL30T, covering pitch diameters from roughly 16mm to 48mm (0.63 in to 1.89 in). Keyway dimensions scale with bore size: 3×1.4mm for smaller bores, up to 6×2.8mm for larger bores, ensuring a secure shaft-to-hub connection without set-screw slippage.
These XL pulleys are well suited for CNC router X/Y axis drives, 3D printer extruder and motion systems, light-duty conveyor belt assemblies, and automated pick-and-place mechanisms where consistent belt-to-pulley engagement is critical. The XL pitch (5.08mm / 0.200 in) is one of the most widely stocked timing belt profiles, making replacement belts easy to source.
| Belt Profile | XL (Extra Light) |
|---|---|
| Pitch | 5.08mm (0.200 in) |
| Pulley Type | AF-type (through-bore with keyway) |
| Teeth Width | 14mm |
| Number of Teeth | XL10T / XL12T / XL14T / XL15T / XL16T / XL18T / XL20T / XL22T / XL24T / XL25T / XL26T / XL28T / XL30T |
| Bore Diameter | 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20mm |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm (varies by bore) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Quantity per Pack | 1 piece |
| Weight | See variant options |
The tooth count determines the pitch diameter of the pulley, which directly affects your drive ratio and belt speed. A higher tooth count gives a larger pitch diameter and slower output speed (or higher torque) when paired with a smaller driver pulley. Calculate your required ratio first, then select the tooth count pair that achieves it. Common starting points for CNC and 3D printer drives are XL16T–XL20T on the motor side.
Measure your motor or drive shaft diameter precisely with calipers. Select the bore that matches your shaft exactly — the keyway provides the positive drive connection, so the bore should be a close fit (typically H7 tolerance). Available bores are 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, and 20mm. The 12.7mm bore is designed for 1/2-inch shafts common in imperial-standard motors.
Keyway dimensions follow standard DIN 6885 sizing and scale with bore diameter. The 8mm bore uses a 3×1.4mm keyway; 10mm and 12mm bores use 3×1.4mm or 4×1.8mm depending on the variant selected; 14mm and 15mm bores use 5×2.3mm; 17mm bores use 5×2.3mm; and 18mm, 19mm, and 20mm bores use 6×2.8mm. Always confirm the keyway option shown in the variant selector matches your shaft key.
Yes. These pulleys conform to the XL timing belt profile standard with a 5.08mm (0.200 in) pitch. They are compatible with any standard XL-profile open or closed-loop timing belt from any manufacturer, provided the belt width is 14mm or narrower. Wider belts will overhang the tooth face and are not recommended.
Aluminum alloy pulleys offer an excellent strength-to-weight ratio for light to medium duty applications such as CNC routers, 3D printers, and small conveyor systems. They are significantly lighter than steel, which reduces rotational inertia and improves dynamic response. For heavy industrial loads or high-torque applications exceeding the aluminum's yield strength, steel pulleys would be more appropriate. For the motion control and maker applications these pulleys are designed for, aluminum is the standard material choice.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in dry indoor environments. For applications in humid, outdoor, or mildly corrosive environments, applying a light coat of dry lubricant or corrosion inhibitor to the bore and keyway is advisable. The tooth faces do not require lubrication — XL timing belts are designed to run dry.
Absolutely. XL-profile pulleys are widely used in DIY CNC routers, laser cutters, and Cartesian 3D printers. The 5.08mm pitch provides a good balance of resolution and load capacity. Pair with a matching XL closed-loop or open-end belt cut to length. For CoreXY or H-bot printer designs, XL16T or XL20T pulleys on NEMA 17 motors with 5mm shafts (bore 8mm with adapter or 5mm bore if available) are common configurations.
