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When your motion system demands repeatable, slip-free power transfer, a worn or mismatched pulley is the first thing to fail. Engineers, makers, and machine builders who rely on XL-pitch belt drives need a pulley that holds tight tolerances across every cycle. This XL synchronous timing pulley is machined to suit a wide range of drive configurations, from compact 3D printer extruder assemblies to full-scale CNC router axes.
Each pulley is machined from aluminum alloy with an anodized or natural finish. The XL pitch (5.08mm / 0.200") tooth profile is compatible with standard XL timing belts. Tooth count options span 10T to 40T, bore sizes range from 3mm to 25mm (approximately 0.12" to 0.98"), and belt slot widths of 11mm or 15mm are available to match your belt width. A set-screw keyway slot secures the pulley to the shaft.
Typical use cases include 3D printer XY gantry and extruder drives, CNC router and laser cutter axis pulleys, robotic arm joint actuators, and light-duty conveyor or indexing systems where XL belt synchronous drive is specified.
| Belt Type | XL (Extra Light) Synchronous / Timing Belt |
|---|---|
| Pitch | 5.08mm (0.200") |
| Tooth Count | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 30T, 32T, 35T, 36T, 40T |
| Bore Diameter | 3mm, 3.175mm, 4mm, 5mm, 6mm, 6.35mm, 6.38mm, 7mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 25mm |
| Belt Slot Width | 11mm or 15mm (select variant) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Outer Diameter | See variant options |
| Hub Diameter | See variant options |
| Flange | See variant options |
| Fastening Method | Set screw with keyway slot |
| Application | 3D printers, CNC routers, laser cutters, robotics, conveyor drives |
Tooth count determines the pulley's pitch diameter and your drive ratio. A smaller tooth count (e.g., 10T–15T) gives a smaller pulley diameter, useful for compact drives or as the driving pulley in a speed-reduction setup. A larger tooth count (e.g., 30T–40T) increases pitch diameter and is typically used as the driven pulley to reduce speed and increase torque. Match your tooth count to your required belt wrap angle and center distance.
The bore must match your shaft diameter exactly. Measure your motor or drive shaft with calipers before ordering. Common 3D printer motor shafts are 5mm; NEMA 23 motors often use 6.35mm (1/4") shafts. CNC and robotics applications may use 8mm, 10mm, 12mm, or larger. Fractional sizes like 3.175mm (1/8"), 6.35mm (1/4"), and 12.7mm (1/2") are available for imperial shaft compatibility.
Two slot width options are available: 11mm and 15mm. The slot width must match your XL timing belt width. Standard XL belts are commonly available in 1/4" (~6.4mm), 3/8" (~9.5mm), and 1/2" (~12.7mm) widths — the 11mm slot accommodates belts up to approximately 10–11mm wide, while the 15mm slot suits wider belt configurations. Always verify your belt width before selecting.
No. This pulley is designed specifically for XL-pitch (5.08mm / 0.200") timing belts. XL tooth geometry is not interchangeable with GT2 (2mm pitch), GT3, or HTD profiles. Using a mismatched belt and pulley combination will result in poor mesh, accelerated wear, and potential drive failure. Confirm your belt pitch before ordering.
The keyway slot and set-screw design provides a secure mechanical connection suitable for the torque levels typical of 3D printer and light CNC applications. For higher-torque applications, ensure the set screw is tightened to the appropriate torque spec using the correct hex key, and consider applying a small amount of thread-locking compound. For very high-torque or shock-load environments, a keyed shaft and matching keyway bore would provide additional security.
Aluminum alloy offers a good balance of low weight and adequate wear resistance for belt drive applications. In typical indoor environments (3D printers, CNC machines, robotics), aluminum pulleys perform reliably over extended service life. For environments with moisture, chemicals, or abrasive dust, periodic inspection is recommended. The anodized or natural finish provides a degree of surface protection against oxidation.
For XL-pitch pulleys, the pitch diameter is calculated as: Pitch Diameter = (Number of Teeth × Pitch) / π = (T × 5.08) / 3.1416. The outer diameter is slightly larger than the pitch diameter. For example, a 20T XL pulley has a pitch diameter of approximately 32.3mm. If you need an exact outer diameter for your design, contact us to confirm before ordering.
