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When your 3D printer skips steps or your CNC axis loses position, the culprit is often a worn or mismatched pulley. Makers, engineers, and automation builders who demand repeatable motion need a GT2 timing pulley that holds tolerance across thousands of cycles. This GT2 aluminum timing pulley is engineered for exactly that — delivering consistent, backlash-resistant power transmission in compact drive systems.
Each pulley is machined from aluminum alloy with an anodized finish for corrosion resistance. The tooth profile conforms to the GT2 (2mm pitch) standard, designed to mesh with standard 6mm-wide GT2 belts. Bore diameters range from 3 mm to 15 mm (approximately 0.12 in to 0.59 in), and tooth counts span 14 T to 30 T, covering a wide range of gear ratio requirements. Optional keyway widths of 3 mm or 4 mm are available on select configurations for positive shaft engagement.
Typical use cases include FDM 3D printer X/Y axis drives (GT2 belt linear motion), desktop CNC router feed axes requiring low-backlash timing, and lightweight robotics or automation platforms where a compact GT2 pulley with selectable bore is needed for rapid prototyping and iterative design.
Available in bore diameters from 3 mm to 15 mm (≈ 0.12"–0.59") to fit common motor and shaft sizes used in 3D printers, CNC machines, and robotics.
Eleven tooth-count variants (14 T, 15 T, 16 T, 18 T, 20 T, 22 T, 24 T, 25 T, 26 T, 28 T, 30 T) allow flexible gear ratio selection for speed or torque optimization.
Select configurations include a 3 mm or 4 mm keyway for positive shaft locking, preventing rotational slip under load — critical for precision positioning axes.
Machined from aluminum alloy with an anodized surface treatment for lightweight rigidity and corrosion resistance in workshop and indoor automation environments.
Tooth geometry conforms to the GT2 standard (2mm pitch), ensuring low-backlash meshing with GT2 belts for accurate, repeatable linear or rotary motion.
Available in packs of 1, 2, or 5 pieces per order, making it easy to stock spares or equip multi-axis machines in a single purchase.
| Belt Type | GT2 (2mm pitch), 6mm width |
|---|---|
| Number of Teeth | 14 T / 15 T / 16 T / 18 T / 20 T / 22 T / 24 T / 25 T / 26 T / 28 T / 30 T |
| Bore Diameter | 3 mm / 3.175 mm / 4 mm / 5 mm / 6 mm / 6.35 mm / 8 mm / 10 mm / 12 mm / 12.7 mm / 14 mm / 15 mm |
| Keyway Width | Without keyway / 3 mm / 4 mm (see variant options) |
| Material | Aluminum alloy, anodized finish |
| Pitch | 2 mm (GT2) |
| Belt Width Compatibility | 6 mm |
| Quantity per Pack | 1 pc / 2 pcs / 5 pcs |
| Hub Outer Diameter | See variant options |
| Overall Height | See variant options |
The tooth count determines your drive ratio. A smaller pulley (e.g., 14 T or 16 T) on the motor paired with a larger pulley on the driven shaft increases torque and reduces speed. For most 3D printer X/Y axes, 20 T is a common standard. For CNC feed axes where higher resolution is needed, a smaller tooth count reduces the distance traveled per motor step. Match your tooth count to your steps-per-mm calculation.
NEMA 17 stepper motors typically have a 5 mm output shaft diameter. Select the 5 mm bore variant for a direct fit. If your motor shaft has a flat (D-cut), a set screw on the pulley hub will engage the flat for a secure connection. For shafts with a keyway, choose the matching keyway width option (3 mm or 4 mm) where available.
Yes. The GT2 tooth profile on these pulleys is compatible with both open-ended GT2 belt stock (sold by the meter) and closed-loop GT2 belts of the appropriate length. Ensure the belt width is 6 mm to match the pulley flange width. Using a belt wider or narrower than 6 mm may cause tracking issues or premature wear.
The no-keyway variants rely on a set screw (grub screw) to clamp the pulley onto the shaft. This is sufficient for most light-to-medium duty applications such as 3D printers. The keyway variants (3 mm or 4 mm) include a machined slot that accepts a matching key on the shaft, providing a positive mechanical lock that prevents rotational slip under higher torque loads — recommended for CNC axes or any application with significant cutting forces.
No. These pulleys are designed specifically for the GT2 tooth profile (2mm pitch). GT3 belts use a different tooth geometry and are not interchangeable. MXL belts also use a different pitch (2.032 mm) and profile. Using a mismatched belt-pulley combination will result in poor meshing, increased noise, and accelerated wear. Always pair GT2 pulleys with GT2 belts.
The keyway width must match the key already cut into your motor or drive shaft. Measure the width of the key slot on your shaft using a caliper. Common sizes for small motors and shafts in the 8–12 mm bore range are 3 mm and 4 mm. If your shaft has no keyway, select the without-keyway variant and use the set screw for retention.
These pulleys are suited for light-to-medium duty applications typical of desktop 3D printers, small CNC routers, and hobby robotics. Exact load ratings depend on belt tension, speed, and shaft support. For heavy industrial applications with sustained high belt tension, consult the load specifications of your belt and verify the pulley bore and hub dimensions are adequate for your shaft and bearing arrangement.
Yes. CoreXY and H-bot motion systems commonly use GT2 pulleys and belts. The 20 T variant with a 5 mm bore is the most widely used configuration for NEMA 17-driven CoreXY builds. Idler pulleys in these systems typically use smooth (toothless) pulleys — these toothed pulleys are intended for the driven (motor) positions. Verify your printer's BOM for the correct tooth count and bore before ordering.
