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When a slipping or mismatched pulley brings your CNC router, 3D printer, or conveyor line to a halt, the cost is more than downtime — it's lost precision and rework. These L-type timing belt pulleys are engineered for engineers, makers, and maintenance technicians who need a drop-in synchronous wheel that holds tooth engagement under load without constant re-tensioning.
Each pulley is machined from aluminum alloy, featuring an L-profile tooth form compatible with standard L-series timing belts. The belt-contact width is 13mm (approximately 0.51 in), with tooth counts ranging from 10T to 20T and bore diameters from 6mm to 28mm (approximately 0.24 in to 1.10 in). Keyway bore variants (K3, K4, K5, K6, K8) are available for shaft-locking applications requiring positive torque transmission.
Typical use cases include CNC axis drives requiring repeatable positioning, 3D printer X/Y motion systems where backlash must be minimized, and light industrial conveyor or indexing table drives where synchronous timing between shafts is critical.
Available in 10T through 20T, letting you dial in the exact gear ratio your drive system requires without custom machining.
Plain bores from 6mm to 28mm and keyway bores (K3–K8) cover the majority of standard motor and shaft diameters used in automation and DIY builds.
Lightweight yet rigid aluminum alloy body reduces rotational inertia while maintaining dimensional stability across typical operating temperatures.
Machined L-series tooth geometry ensures positive engagement with L-type belts, eliminating the tooth-skip that plagues mismatched pulley-belt combinations.
Keyway variants (K3, K4, K5, K6, K8) provide a mechanical lock between pulley and shaft, preventing rotational slip under high-torque or reversing loads.
Flanged profile and tooth width are matched to 13mm L-series belts, maintaining belt tracking and reducing edge wear during continuous operation.
| Belt Type | L-series (3/8" pitch) |
|---|---|
| Applicable Belt Width | 13mm (approx. 0.51 in) |
| Tooth Count | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T |
| Bore Diameter | 6–28mm plain; keyway bores K3, K4, K5, K6, K8 available |
| Material | Aluminum alloy |
| Tooth Profile | L-type (trapezoidal) |
| Flange | See variant options |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Set Screw | See variant options |
| Surface Finish | Natural anodized / machined |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driver pulley teeth to get the ratio. For a 1:1 ratio use matching tooth counts on both pulleys. For speed reduction, use a larger tooth count on the driven side. Common CNC and 3D printer setups use 20T on the motor for a balance of speed and torque.
Measure your motor or drive shaft diameter with a caliper. Select the plain bore that matches your shaft diameter exactly — for example, a 6.35mm bore fits a 1/4" shaft. If your shaft has a keyway, select the corresponding keyway bore variant (e.g., 10K3 means 10mm bore with a 3mm keyway).
The format is [bore diameter]K[keyway width]. For example, 10K3 = 10mm bore with a 3mm keyway slot; 14K5 = 14mm bore with a 5mm keyway. You will need a matching key and keyed shaft to use these variants. Keyway bores prevent the pulley from spinning on the shaft under load.
These pulleys are designed for standard L-series timing belts with a 3/8" (9.525mm) pitch and 13mm width. Verify your belt's pitch and width before ordering. Using a belt with a different pitch or width will result in poor tooth engagement and premature wear.
Aluminum alloy pulleys are suitable for light-to-medium duty applications such as CNC routers, 3D printers, laser cutters, and small conveyor systems. For heavy industrial loads or high-shock environments, consult your system's torque and load specifications to confirm suitability. The aluminum construction keeps rotational inertia low, which benefits servo and stepper motor response.
Aluminum alloy naturally forms a protective oxide layer that resists corrosion in typical indoor environments. No lubrication is required for the pulley itself. The mating timing belt should be kept free of oils and solvents, as these can degrade belt rubber and reduce friction characteristics.
Yes. L-type pulleys are widely used in CNC routers, laser engravers, and larger-format 3D printers where the GT2 belt system is undersized. Confirm your machine uses an L-series belt (3/8" pitch) and 13mm belt width before ordering. Check your motor shaft diameter and select the matching bore variant.
