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When a slipping or mismatched pulley derails your motion system mid-run, the cost is more than downtime — it's lost calibration, wasted material, and frustration. Engineers, makers, and automation builders who rely on GT2 belt drives need a pulley that holds tooth engagement under load without play or wobble. These 2GT 10mm timing belt drive pulleys are designed for exactly that use case.
Each pulley is machined from aluminum alloy with a smooth-tooth 2GT profile, compatible with standard 10mm-wide GT2 timing belts. Available in tooth counts of 50T, 55T, 60T, 70T, and 80T, with bore diameters ranging from 4mm to 15mm (approximately 0.16 in to 0.59 in). Optional keyway widths of 3mm, 4mm, or 5mm are available on select bore/tooth combinations for positive shaft locking.
Typical applications include 3D printer X/Y axis drives requiring consistent belt tension, CNC router and laser cutter feed systems where tooth count affects step resolution, and robotic arm joint drives where bore-to-shaft fit is critical for torque transmission accuracy.
Five tooth count options (50T, 55T, 60T, 70T, 80T) let you tune belt drive ratio and step resolution for your specific motion system requirements.
Bore diameters from 4mm to 15mm (including 6.35mm / 1/4" and 12.7mm / 1/2" imperial sizes) cover most stepper motor and servo shaft standards.
Select variants include a machined keyway (3mm, 4mm, or 5mm width) to prevent rotational slip under high-torque or reversing-load conditions.
Smooth-tooth 2GT profile with 2mm pitch ensures low-backlash meshing with standard GT2 belts used in 3D printers, CNC machines, and robotics.
Lightweight aluminum body reduces rotational inertia while providing sufficient rigidity for continuous-duty belt drive applications.
Available in 1-piece or 2-piece quantities per order, allowing you to stock matched pairs for dual-axis or mirrored drive configurations.
| Belt Profile | 2GT (GT2), 2mm pitch |
|---|---|
| Belt Width Compatibility | 10mm |
| Number of Teeth | 50T / 55T / 60T / 70T / 80T (see variant options) |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 mm (see variant options) |
| Keyway Width | Without keyway / 3mm / 4mm / 5mm (see variant options) |
| Material | Aluminum alloy |
| Flange | See variant options |
| Outer Diameter (approx.) | See variant options |
| Hub Length | See variant options |
| Quantity per Pack | 1 pc or 2 pcs (see variant options) |
| Surface Finish | Natural anodized / machined |
Tooth count directly affects your drive ratio and linear resolution. A higher tooth count increases the belt distance traveled per motor revolution, which lowers resolution but increases speed. For 3D printers and CNC routers where fine positioning matters, lower tooth counts (50T–60T) are common. For conveyor or feed applications where speed is prioritized, 70T–80T may be appropriate. Match your tooth count to your motor steps/rev and desired mm/step.
Measure your motor or drive shaft diameter precisely with calipers. Common stepper motor shaft sizes are 5mm, 6.35mm (1/4"), 8mm, and 10mm. The bore must match the shaft diameter — a loose fit causes runout and belt skip. If your shaft is imperial (e.g., 1/4" or 1/2"), select the 6.35mm or 12.7mm bore options respectively.
A keyway is recommended when your application involves high torque, frequent direction reversals, or sustained load — such as CNC axis drives or robotic joints. Without a keyway, the pulley is retained by set screws alone, which can slip under heavy load. Keyway width must match the key stock on your shaft: 3mm keys suit smaller shafts (8–10mm bore), 4mm suits mid-range (10–12mm bore), and 5mm suits larger bores (12.7–15mm). Confirm your shaft's keyway spec before ordering.
Yes. The 2GT profile is standardized with a 2mm pitch and is dimensionally interchangeable with GT2 belts from all major belt manufacturers. Ensure the belt width is 10mm to match this pulley's flange spacing. Mixing 6mm-wide belt pulleys with 10mm belts will cause tracking issues.
Aluminum alloy pulleys are well-suited for the belt tension loads typical in 3D printers, laser cutters, and light CNC machines. For heavy industrial applications with sustained high belt tension (above approximately 200N), consider whether a steel pulley is more appropriate. For the vast majority of maker and automation use cases, aluminum provides adequate strength with the benefit of lower rotational inertia.
Aluminum alloy naturally forms a protective oxide layer that resists corrosion in typical indoor environments. No lubrication is required for the pulley itself — GT2 timing belts are designed to run dry. Avoid exposing the pulley to strong acids, alkalis, or salt spray environments without additional protective coating.
Yes. Select the "2 pcs" quantity option in the Keyway width & Qty(pcs) variant selector to receive two identical pulleys in one order. This is ideal for CoreXY 3D printer builds, dual-motor gantry systems, or any application requiring matched pulleys on both ends of a belt run.
