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When a skipped tooth or a loose bore fit throws off your print layer or CNC cut, the root cause is almost always a pulley that was never spec'd for the job. Engineers, makers, and repair technicians who depend on repeatable, backlash-free motion need a GT2 timing belt pulley they can trust across hundreds of hours of operation.
These GT2 timing belt pulleys are machined from aluminum alloy with a hard-anodized finish. Each pulley is designed for 6 mm wide GT2 belts and is available in tooth counts from 14T to 30T, with bore diameters ranging from 3 mm to 15 mm (approximately 0.12 in to 0.59 in). Keyway bore variants (K3 / K4) are also available for shaft-keyed applications.
Typical use cases include 3D printer X/Y axis drives (GT2 6mm belt open-loop systems), desktop CNC router feed-axis assemblies, laser engraver gantry drives, and light-duty robotic joint actuators where a compact GT2 timing pulley with selectable bore is required.
Eleven tooth-count options let you dial in the exact gear ratio your motion system needs without compromising belt engagement.
Standard round bores from 3 mm to 15 mm plus keyway variants (K3, K4) cover the majority of stepper and servo motor shaft sizes used in desktop fabrication equipment.
Lightweight yet rigid aluminum body keeps rotational inertia low — critical for high-acceleration 3D printer and CNC axis moves.
Tooth geometry conforms to the GT2 (2 mm pitch) standard, ensuring zero-backlash mesh with GT2 belts and consistent layer registration on FDM printers.
Surface treatment resists wear from continuous belt contact and protects against corrosion in workshop environments with varying humidity.
Each pulley includes set-screw holes for secure shaft locking, preventing axial slip during rapid direction changes on CNC and printer axes.
| Belt Type | GT2 (2 mm pitch) |
|---|---|
| Applicable Belt Width | 6 mm |
| Tooth Count | 14T / 15T / 16T / 18T / 20T / 22T / 24T / 25T / 26T / 28T / 30T |
| Bore Diameter | 3 / 3.175 / 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 mm (see variant options) |
| Keyway Bore Options | 8K3, 10K3, 10K4, 12K4 (see variant options) |
| Material | Aluminum alloy |
| Surface Finish | Hard anodized |
| Outer Diameter | See variant options |
| Hub Width | See variant options |
| Weight | See variant options |
| Retention Method | Set screw |
| Application | 3D printers, CNC routers, laser engravers, robotics |
Tooth count determines your drive ratio and steps-per-mm. Most cartesian 3D printers (e.g., Ender series) use 20T pulleys on the X/Y axes. Smaller tooth counts (14T–18T) give finer resolution per motor step; larger counts (24T–30T) increase speed at the cost of resolution. Match the tooth count to your firmware's steps-per-mm setting and motor driver microstepping.
Measure your motor shaft diameter with calipers before ordering. NEMA 17 motors typically have a 5 mm shaft; NEMA 23 motors commonly use 6.35 mm (1/4") or 8 mm shafts. For keyed shafts, select the corresponding K3 or K4 keyway bore variant. When in doubt, choose the bore that matches your shaft diameter exactly — an undersized bore cannot be installed, and an oversized bore will cause runout.
Yes. The GT2 2 mm pitch tooth profile meshes correctly with both open-ended GT2 belt stock and closed-loop GT2 belt loops, provided the belt width is 6 mm. Do not use these pulleys with GT3 or HTD belts, as the tooth profiles are not interchangeable.
Aluminum alloy pulleys are well-suited for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in 3D printing and light CNC routing. For heavy-duty CNC milling with high feed forces, consider whether a steel pulley is more appropriate. The hard-anodized surface significantly extends tooth wear life compared to bare aluminum under continuous belt contact.
Hard anodizing creates an aluminum oxide layer that is substantially more corrosion-resistant than bare aluminum. For typical indoor workshop conditions — including moderate humidity — the finish provides reliable long-term protection. Avoid prolonged exposure to salt spray or strong acids, which can degrade the anodized layer over time.
A standard round bore relies entirely on set screws to prevent shaft rotation. A keyway bore (K3 = 3 mm keyway, K4 = 4 mm keyway) includes a machined slot that accepts a matching key on the motor shaft, providing a positive mechanical lock that prevents rotational slip under higher torque loads. Use keyway variants when your motor shaft has a corresponding keyway cut.
These pulleys are designed as drive pulleys with set-screw retention for motor shafts. They can function as idlers if mounted on a smooth shaft or bolt with appropriate bearings, but they do not include integrated bearings. For dedicated idler use, a flanged idler pulley with a built-in bearing is typically a better choice.
