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When your motion system demands repeatable, slip-free power transfer, a worn or mismatched timing belt pulley becomes the weakest link in the chain. Engineers, CNC builders, and automation hobbyists who need exact tooth engagement and a secure shaft fit will find these XL timing belt pulleys a reliable solution across a wide range of drive configurations.
Each pulley is machined to the XL (Extra Light) tooth profile with a pitch of 5.08 mm (0.200 in), a belt width of 14 mm (0.55 in), and a tooth count ranging from 15T to 60T. Bore options span 8 mm to 28 mm (approximately 0.31 in to 1.10 in), and each pulley ships with a matching keyway — sized 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, or 8×3.3 mm depending on the bore — to lock the pulley firmly to the shaft.
Typical use cases include CNC router X/Y axis drives, 3D printer extruder and gantry systems, light conveyor belt assemblies, and general-purpose stepper or servo motor power transmission where an XL-profile timing belt pulley with keyway is required for positive torque transfer without slippage.
Choose from 27 tooth-count options to dial in your exact gear ratio for speed or torque requirements in CNC, robotics, or conveyor applications.
The XL (Extra Light) tooth profile ensures positive engagement with standard XL timing belts, eliminating belt slip under moderate loads.
Available in bore diameters from 8 mm to 28 mm to fit a broad range of motor and shaft sizes without custom machining.
Each pulley includes a precision-cut keyway (3×1.4 mm up to 8×3.3 mm depending on bore) to prevent rotational slippage under load.
The 14 mm working width keeps the belt tracking straight, reducing edge wear and extending belt service life in continuous-duty setups.
Pulleys are machined to consistent tooth geometry, ensuring smooth meshing with XL belts and predictable motion in precision-driven systems.
| Belt Profile | XL (Extra Light) |
|---|---|
| Pitch | 5.08 mm (0.200 in) |
| Belt Width | 14 mm (0.55 in) |
| Tooth Count | 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 42T, 44T, 45T, 46T, 48T, 50T, 60T |
| Bore Diameter | 8 mm, 10 mm, 12 mm, 12.7 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 22 mm, 24 mm, 25 mm, 28 mm |
| Keyway Sizes | 3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 8×3.3 mm (varies by bore) |
| Quantity per Order | 1 piece |
| Material | See variant options |
| Finish / Colour | See variant options |
| Flange | See variant options |
The tooth count determines the pulley's pitch diameter and, combined with your belt length and the driven pulley's tooth count, sets your drive ratio. For a 1:1 ratio use identical tooth counts on both pulleys. To increase speed at the output, use a smaller tooth count on the motor pulley and a larger one on the driven shaft — and vice versa to increase torque. Calculate pitch diameter as: PD = (Tooth Count × Pitch) ÷ π.
Measure your motor or drive shaft diameter with a caliper and select the matching bore. Available bores range from 8 mm to 28 mm. The keyway dimensions are fixed per bore size (e.g., 8 mm bore uses a 3×1.4 mm keyway; 28 mm bore uses an 8×3.3 mm keyway), so confirm your shaft has a matching keyway slot or plan to machine one.
Yes — these pulleys are designed for standard XL-profile timing belts with a 5.08 mm (0.200 in) pitch. They are compatible with 14 mm wide XL belts. They are NOT compatible with other belt profiles such as MXL, L, T5, T10, GT2, or HTD. Always verify the belt profile and width before ordering.
The load capacity depends on the material (see variant options), tooth count, belt tension, and operating speed. XL-profile pulleys are rated for light-to-moderate duty applications such as CNC machines, 3D printers, and small conveyor systems. For heavy industrial loads, consult the torque rating of your specific belt and pulley combination. The keyway provides positive torque transfer and prevents rotational slippage.
Corrosion resistance depends on the material of the specific variant you select. Please refer to the variant options or contact us to confirm the material and surface treatment. For environments with moisture, chemicals, or outdoor exposure, we recommend confirming the material specification before purchase.
The pulleys are machined with a keyway slot, but you can use them without a key if your application does not require positive torque locking — for example, in low-torque or positioning-only applications. However, for any application where the pulley must transmit significant torque, using the key is strongly recommended to prevent the pulley from rotating on the shaft.
The keyway size is determined by the bore diameter and follows standard DIN 6885 key dimensions. Smaller bores (8–10 mm) use a 3×1.4 mm key; medium bores (12–15 mm) use 4×1.8 mm or 5×2.3 mm keys; larger bores (16–20 mm) use 5×2.3 mm or 6×2.8 mm keys; and the largest bores (22–28 mm) use 6×2.8 mm or 8×3.3 mm keys. Select the variant that matches both your bore diameter and your shaft's existing keyway slot.
