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When a slipping or mismatched pulley throws off your axis calibration or belt tension, every print layer and every CNC pass pays the price. Engineers, hobbyists, and machine builders who demand repeatable, low-backlash linear motion need a drive pulley machined to spec — not a generic casting. These 2GT 6mm timing belt pulleys are designed for that exact use case.
Each pulley is machined from aluminum alloy with a smooth-tooth 2GT (GT2) profile and a 6 mm wide belt groove. Tooth counts range from 50 T to 80 T (50, 55, 60, 70, 80 teeth), and bore diameters span 4 mm to 15 mm (approx. 0.157 in – 0.591 in), including the common 6.35 mm (1/4 in) and 12.7 mm (1/2 in) imperial sizes. Optional keyway widths of 3 mm, 4 mm, or 5 mm are available on select bore/tooth combinations for positive shaft locking.
Typical applications include 2GT belt-driven 3D printer axes (CoreXY, Cartesian, delta), CNC router gantry drives, laser engraver carriages, and lightweight robotics joint actuators — anywhere a 2GT 6mm open or closed-loop belt system requires a reliable drive pulley with a precise bore fit.
Five tooth counts (50, 55, 60, 70, 80 T) let you dial in the exact gear ratio and belt wrap angle your drive system requires.
Bore options from 4 mm to 15 mm — including 6.35 mm (1/4") and 12.7 mm (1/2") — cover metric and imperial shaft standards without adapters.
Select variants include a 3 mm, 4 mm, or 5 mm keyway slot, eliminating rotational slip under load for shaft-critical applications.
The GT2 curvilinear tooth form reduces belt stress concentration and operates quietly at moderate speeds compared to trapezoidal profiles.
Lightweight yet rigid aluminum body keeps rotating inertia low — an advantage in high-acceleration 3D printer and CNC motion systems.
Available in 1-piece or 2-piece packs so you can stock both axes of a CoreXY or dual-drive gantry in one order.
| Belt Profile | 2GT (GT2) |
|---|---|
| Belt Width | 6 mm |
| Tooth Pitch | 2 mm |
| Number of Teeth | 50 T / 55 T / 60 T / 70 T / 80 T |
| Bore Diameter | 4, 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15 mm |
| Keyway Width | Without keyway / 3 mm / 4 mm / 5 mm (see variant options) |
| Material | Aluminum alloy |
| Flange | See variant options |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Set Screw | See variant options |
| Quantity per Pack | 1 pc / 2 pcs (see variant options) |
Tooth count determines the pulley pitch diameter and, combined with your motor steps-per-revolution, the linear resolution of your axis. A 50 T pulley has a smaller pitch diameter than an 80 T pulley, so it moves less belt per motor revolution — useful for finer resolution. Higher tooth counts increase belt wrap and reduce tooth load but require more space. Match your tooth count to your existing belt loop length and desired steps/mm calculation.
For most 3D printer and light CNC applications, a set screw against a flat-ground shaft is sufficient. If your application involves significant torque reversals, high acceleration, or a fully round shaft with no flat, a keyway variant provides a mechanical positive drive that prevents rotational slip. Check your shaft specification before selecting.
Yes. The 2GT profile is dimensionally identical to the GT2 profile used in most open-source 3D printer designs (Voron, Prusa, RatRig, etc.) and is compatible with standard 6 mm wide 2GT/GT2 timing belts. Confirm the belt width is 6 mm — these pulleys are not designed for 9 mm or 10 mm wide belts.
Standard NEMA 17 stepper motors have a 5 mm diameter output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, a set screw tightened against the flat is the standard mounting method — no keyway is required for most NEMA 17 applications.
For a 2GT pulley, pitch diameter (mm) = (Number of Teeth × Pitch) ÷ π = (T × 2) ÷ π. For example, a 50 T pulley has a pitch diameter of approximately 31.83 mm. Belt speed (mm/s) = pitch diameter × π × RPM ÷ 60. Use this to verify your steps/mm setting matches your firmware configuration.
Yes. CoreXY and H-bot systems typically use two drive pulleys on the A and B motor shafts. Ordering a 2-piece pack of the same tooth count and bore ensures matched geometry on both axes, which is important for maintaining equal belt tension and print accuracy.
6.35 mm is the metric equivalent of 1/4 inch, and 12.7 mm equals 1/2 inch — both are standard imperial shaft sizes common in North American CNC routers and servo motors. If your shaft is specified in inches, use these bore sizes to avoid the need for a bushing or adapter.
