Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
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, makers, and automation builders who demand repeatable, slip-free motion need a synchronous pulley that fits their shaft exactly and meshes cleanly with their belt — every single cycle. These L-type synchronous timing pulleys are engineered for that purpose, available in a wide tooth count range from 14T to 40T with bore diameters from 5mm to 30mm (0.20" to 1.18").
Each pulley features an L-pitch tooth profile (9.525mm / 0.375" pitch) machined to accept a 20mm-wide (0.79") synchronous belt. The tooth width is 21mm, providing full belt engagement with standard 20mm L-type belts. Bore diameters span 5mm through 30mm (0.20"–1.18"), and tooth counts range from 14T to 40T, covering a broad spectrum of drive ratios. Material is aluminum alloy with a natural or anodized finish, offering a balance of light weight and structural rigidity suitable for continuous-duty motion applications.
Typical use cases include CNC router X/Y axis drives requiring precise linear positioning, FDM 3D printer extruder and motion systems where consistent belt tension is critical, and light industrial conveyor or robotic arm joints where a synchronous L-type timing pulley with custom bore diameter eliminates adapter sleeves and shaft play.
Available from 14T to 40T, enabling a broad range of drive ratios for speed reduction or torque multiplication in CNC and automation systems.
Bore diameters from 5mm to 30mm (0.20"–1.18") accommodate common motor and shaft sizes without requiring custom machining or adapter bushings.
The 9.525mm L-pitch tooth geometry provides positive engagement with L-type synchronous belts, eliminating the slip and backlash common in friction-drive systems.
The 21mm tooth width provides full-width engagement with standard 20mm L-type belts, maximizing load distribution and reducing belt edge wear.
Lightweight aluminum alloy body reduces rotational inertia for faster acceleration and deceleration in dynamic motion control applications.
Standard L-pitch dimensions ensure direct interchangeability with other L-type pulleys in existing CNC, 3D printer, and conveyor drive systems.
| Belt Type | L-pitch synchronous belt |
|---|---|
| Belt Pitch | 9.525mm (0.375") |
| Belt Width Compatibility | 20mm (0.79") |
| Tooth Width | 21mm |
| Tooth Count (Variants) | 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 28T, 30T, 40T |
| Bore Diameter (Variants) | 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, 30mm |
| Material | Aluminum alloy |
| Finish | See variant options |
| Outer Diameter (approx.) | See variant options |
| Hub Style | See variant options |
| Keyway | Contact us to confirm |
| Set Screw | Contact us to confirm |
| Weight | See variant options |
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 14T drive pulley paired with a 28T driven pulley gives a 2:1 reduction, halving speed and doubling torque. For CNC routers and 3D printers, 14T–20T drive pulleys are most common for direct motor coupling.
Measure your motor or shaft diameter with a caliper. Select the bore that matches your shaft exactly — a bore that is too large will cause runout and positioning errors. If your shaft falls between listed sizes, select the next larger bore and use a set screw or keyway to secure it, or have the bore finish-machined to your exact shaft diameter.
Yes. These pulleys use the standard L-pitch profile (9.525mm pitch) and are designed for 20mm-wide L-type synchronous belts. They are interchangeable with other L-pitch pulleys from any manufacturer that follows the standard L-belt tooth geometry.
The pulleys are machined from aluminum alloy, which has inherent corrosion resistance in typical indoor environments. For humid or outdoor applications, an anodized finish provides additional protection. Avoid prolonged exposure to salt spray or strong acids without additional surface treatment.
Yes. L-type pulleys are widely used in CNC router axis drives and some larger-format 3D printer motion systems. Confirm that your belt is L-pitch (9.525mm) and 20mm wide before ordering. Smaller desktop 3D printers typically use GT2 or T5 belts — verify your belt type before purchasing.
Set screw and keyway availability varies by variant. Please contact us to confirm the hub configuration for your selected tooth count and bore combination before ordering if your application requires a specific retention method.
Tooth width (21mm on these pulleys) refers to the axial width of the pulley's toothed section. Belt width (20mm) is the width of the belt itself. The pulley tooth width is intentionally slightly wider than the belt to allow the belt to track centrally without riding against the flanges, which reduces edge wear and noise.
