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When your motion-control build demands repeatable, backlash-free power transfer, a mismatched or worn pulley is the first thing that derails accuracy. Whether you are a maker upgrading a 3D printer, an engineer designing a CNC router, or a hobbyist assembling a belt-driven robot arm, these 2GT timing belt pulleys give you the exact tooth count and bore diameter you need without compromise.
Each pulley is machined from aluminum alloy with a hard-anodized finish, featuring a 2mm pitch GT2 tooth profile. The tooth range spans 16T to 60T, and bore diameters run from 3.17mm (~0.125 in) up to 12mm (~0.47 in) to suit common motor shaft sizes. All variants are designed to fit 6mm wide 2GT/GT2 timing belts.
Typical applications include CoreXY and Cartesian 3D printer X/Y axes, open-loop CNC pen plotters and laser engravers, lightweight robotic joint drives, and automated camera slider systems — anywhere a 2GT timing belt pulley with a precise tooth count is required for smooth, low-noise linear or rotary motion.
Available in 16T, 20T, 25T, 30T, 40T, and 60T configurations, covering low-torque high-speed and high-torque low-speed drive ratios for diverse motion-control applications.
Bore options from 3.17mm to 12mm accommodate NEMA 17, NEMA 23, and other common stepper and servo motor shaft sizes without requiring custom machining.
Machined from aluminum alloy for a balance of light weight and structural rigidity, keeping rotational inertia low while maintaining dimensional stability under continuous cycling loads.
The 2GT / GT2 tooth geometry provides positive engagement with the belt, minimizing tooth jump and maintaining positional accuracy in open-loop stepper-driven systems.
Flanged pulley body is sized specifically for 6mm wide 2GT belts, keeping the belt tracked reliably without lateral drift during high-cycle operation.
Standard GT2 dimensions make these pulleys direct replacements for worn or undersized OEM pulleys on popular 3D printer platforms and DIY CNC kits without frame modification.
| Belt Profile | 2GT / GT2 |
|---|---|
| Pitch | 2mm |
| Belt Width Compatibility | 6mm |
| Tooth Count Options | 16T, 20T, 25T, 30T, 40T, 60T |
| Bore Diameter Options | 3.17mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm |
| Material | Aluminum alloy |
| Finish | See variant options |
| Flange | Yes (both sides) |
| Set Screw | See variant options |
| Outer Diameter (approx.) | See variant options |
| Hub Length (approx.) | See variant options |
| Packing Quantity | 1 pc per order |
Tooth count determines the pulley's pitch diameter and affects your drive ratio. A 20T pulley is the most common choice for 3D printer X/Y axes (e.g., Ender, Prusa style machines). Use a higher tooth count (30T–60T) when you need more belt contact, smoother motion at low speeds, or a speed-reduction ratio. Use a lower tooth count (16T–20T) for higher speed with a given motor RPM.
Standard NEMA 17 stepper motors have a 5mm output shaft diameter. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, the set screw on the pulley will lock onto the flat. For NEMA 23 motors, the shaft is typically 6.35mm or 8mm — choose the matching bore accordingly.
Yes. The 2GT tooth profile is dimensionally identical to the GT2 profile used across the industry. These pulleys will mesh correctly with any standard 2mm pitch, 6mm wide GT2 or 2GT timing belt regardless of brand, as long as the belt width is 6mm.
Aluminum alloy pulleys offer significantly higher dimensional stability and fatigue resistance than injection-molded plastic pulleys. They resist deformation under belt tension, maintain tooth geometry over long run times, and dissipate heat better — making them the preferred choice for continuous-duty CNC and automation applications.
Aluminum naturally forms a thin oxide layer that protects against further corrosion in typical indoor environments. For applications exposed to moisture or mild chemicals (e.g., laser engravers with water cooling nearby), the anodized finish provides additional protection. These pulleys are not rated for submersion or highly corrosive environments.
These are drive pulleys designed to mount on a motor shaft via set screw. For idler use, you would typically need a smooth (toothless) idler pulley or a toothed idler with a bearing insert. Contact us to confirm if a specific variant can be adapted for your idler configuration.
All 20T variants share the same tooth count and pitch diameter — the only difference is the bore hole diameter (3.17mm, 4mm, 5mm, 6mm, 6.35mm, or 8mm). Choose the bore that matches your motor shaft. The outer tooth geometry and belt compatibility are identical across all 20T options.
