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When a slipping or misaligned drive wheel derails your build mid-project, every minute of downtime costs you. Engineers, makers, and workshop enthusiasts who need repeatable, zero-slip motion transfer rely on a timing pulley that holds its position under load. These XL timing pulleys are machined to the XL (Extra Light) belt standard with a 5.08mm (0.200") pitch, making them a direct fit for standard XL synchronous belts used across CNC routers, 3D printers, laser cutters, and automated feed systems.
Each pulley is machined from aluminum alloy, featuring a clean bore and a flat-face profile without a step flange, keeping the overall assembly compact. The belt-contact width is 11mm, matching standard XL belt widths. Tooth counts range from 10T to 40T, and bore diameters span 4mm to 16mm (approximately 0.16" to 0.63"), giving you the flexibility to match your shaft size without custom machining. The bore is finished smooth and ready for a set-screw or keyway modification.
Typical use cases include: replacing worn drive pulleys on desktop CNC routers where XL belt drives control axis movement; building custom 3D printer extruder or motion systems that require a specific gear ratio between motor shaft and lead screw; and constructing DIY conveyor or indexing mechanisms where consistent step-to-distance accuracy is critical for repeatable positioning.
Machined to the XL belt standard (5.08mm / 0.200" pitch) for direct compatibility with off-the-shelf XL synchronous belts — no adapters needed.
Nine tooth-count options from XL10T to XL40T let you dial in the exact drive ratio your motion system requires without custom fabrication.
Bore diameters from 4mm to 16mm (0.16"–0.63") cover a broad range of motor and shaft sizes, reducing the need for bushings or adapters.
The stepless flat-face design keeps the pulley body compact and simplifies alignment in tight drive assemblies where axial space is limited.
Designed for 11mm-wide XL belts — the most common width in desktop CNC and 3D printer drive systems — ensuring full tooth engagement across the belt face.
Lightweight aluminum alloy body reduces rotational inertia for faster acceleration response in servo and stepper motor drive applications.
| Belt Standard | XL (Extra Light) |
|---|---|
| Pitch | 5.08mm (0.200") |
| Tooth Count (Number Tooth) | 10T, 12T, 15T, 16T, 18T, 20T, 25T, 30T, 40T |
| Belt Width | 11mm |
| Bore Diameter | 4mm / 5mm / 6mm / 6.35mm / 8mm / 10mm / 12mm / 14mm / 15mm / 16mm |
| Material | Aluminum Alloy |
| Flange / Step | Without Step (Flat Face) |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Finish | Natural Aluminum (uncoated) |
| Quantity per Order | 1 Piece |
The tooth count determines your drive ratio. A smaller pulley (e.g., XL10T) on the motor shaft paired with a larger pulley on the driven shaft reduces speed and increases torque. A larger motor pulley (e.g., XL40T) increases output speed. Match your tooth count to the gear ratio your motion system requires — for CNC and 3D printers, common motor-side pulleys are 16T–20T.
Most NEMA 17 stepper motors use a 5mm shaft, so the 5mm bore variant is the most common choice for 3D printers and small CNC machines. NEMA 23 motors typically use a 6.35mm (1/4") or 8mm shaft. Measure your motor shaft diameter before ordering. If your shaft is metric, select the matching metric bore; for imperial shafts, the 6.35mm bore fits a standard 1/4" shaft.
Yes. These pulleys are machined to the XL belt standard with a 5.08mm pitch, which is an industry-standard specification. They are compatible with any XL synchronous belt up to 11mm wide from any manufacturer that follows the XL standard. Confirm your belt's pitch and width before purchasing.
Aluminum alloy pulleys are well-suited for light-to-medium duty applications such as 3D printers, desktop CNC routers, and small automation systems. For heavy industrial loads or high-torque applications, consider steel pulleys. In typical DIY and maker applications, aluminum XL pulleys handle the torque output of NEMA 17 and NEMA 23 stepper motors without issue when properly secured with a set screw.
Aluminum alloy has natural oxidation resistance, forming a thin protective oxide layer that prevents surface rust in typical indoor workshop conditions. For environments with high humidity, coolant exposure, or outdoor use, consider applying a light coating of machine oil or selecting an anodized variant if available. These pulleys are not rated for submersion or continuous wet environments.
A "with step" (flanged) pulley has raised collars on one or both sides of the tooth profile that help keep the belt from walking off the pulley laterally. A "without step" (flat-face) pulley like this one has no flanges, resulting in a more compact profile. Flat-face pulleys are commonly used in systems where the belt is guided by the frame or tensioner, or where axial space is tight. If your belt tends to track off-center, consider adding a flanged pulley or belt guide to your assembly.
Yes. XL timing pulleys are used in belt-driven Z-axis configurations on certain 3D printer designs. Select a tooth count that matches your existing belt drive ratio and a bore size that fits your Z-axis motor shaft. Ensure the 11mm belt width matches your belt. For CoreXY and similar motion systems, XL20T with a 5mm bore is a common starting point.
