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When a slipping or misaligned timing belt derails your CNC router, 3D printer, or automation rig mid-run, the culprit is often an undersized or poorly matched pulley. These XL timing idler drive pulleys are engineered for makers, engineers, and machine builders who need reliable, repeatable belt engagement across a wide range of drive ratios and shaft sizes.
Each pulley features a step gear body machined to accept XL-profile (5.08mm pitch) belts at 11mm tooth width. The bore diameter ranges from 4mm to 20mm (0.16" to 0.79"), and tooth counts span 10T to 25T, giving you fine control over gear ratio and belt wrap. The step flange design keeps the belt tracking true without additional guides.
Typical applications include XL belt-driven CNC axis drives, 3D printer X/Y gantry systems, laser engraver carriage drives, and light-duty conveyor or indexing mechanisms where a compact idler drive pulley for 10mm XL belt is required.
| Belt Profile | XL (5.08mm pitch) |
|---|---|
| Belt Width Compatibility | 10mm |
| Tooth Width | 11mm |
| Tooth Count Options | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T |
| Bore Diameter Options | 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm |
| Flange Style | Step gear (integrated flanges) |
| Material | See variant options |
| Finish / Color | See variant options |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Quantity per Order | 1 Pcs or 5 Pcs (select above) |
The tooth count determines your drive ratio. Divide the driven pulley tooth count by the drive pulley tooth count to get the ratio. For example, a 20T drive and 10T driven gives a 2:1 speed increase. For CNC and 3D printer axes, 16T–20T is a common starting point for balanced speed and torque.
Match the bore to your shaft diameter exactly. Common stepper motor shaft sizes are 5mm and 6.35mm (¼"). Servo and DC motor shafts often use 6mm, 8mm, or 10mm. Measure your shaft with calipers before ordering — a bore that is too large will cause runout and belt skip.
Yes. XL is a standardized belt profile (5.08mm pitch, 40° tooth angle) defined by industry standards. These pulleys are compatible with any XL-profile timing belt that is 10mm wide, regardless of brand, as long as the pitch matches.
Yes. The step flange design and toothed profile make it suitable for use as a tensioner idler, a drive pulley, or a driven pulley. When used as an idler, ensure the bore is fitted with an appropriate bearing or bushing for your shaft.
These pulleys are designed for light-to-medium duty applications typical of CNC routers, 3D printers, laser engravers, and small automation systems. For exact load ratings, contact us with your application details — torque, speed, and duty cycle — and we can advise on suitability.
The 1 Pcs option is ideal for single-axis replacements or prototyping. The 5 Pcs option offers a lower per-unit cost and is suited for multi-axis machines (e.g., X, Y, Z, and extruder on a 3D printer) or keeping spares on hand for production environments.
Set screw retention depends on the specific variant. If your application requires a keyway or grub screw, please contact us to confirm availability for your chosen tooth count and bore combination before ordering.
