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When your 3D printer skips steps or your CNC axis loses position, the culprit is often a worn or mismatched timing pulley. Engineers, makers, and automation builders who demand repeatable, slip-free motion need a synchronous wheel they can trust across thousands of cycles. These 2GT timing pulleys are engineered for exactly that — delivering consistent tooth engagement and zero-backlash drive in demanding motion-control applications.
Each pulley is machined from aluminum alloy with a natural silver or black anodized finish (see variant options). The 2GT profile features a 2mm pitch and 6mm belt width, with tooth counts ranging from 28 to 50 teeth and bore diameters from 4mm to 15mm (approximately 0.16 in to 0.59 in). Keyway bore options (3mm and 4–5mm keyways) are available on select sizes for positive shaft locking.
Typical use cases include Cartesian and CoreXY 3D printer X/Y axis drives, CNC router spindle-to-motor belt reduction, desktop robotic arm joint actuation, and linear motion systems requiring precise step-to-distance ratios. Long-tail search terms: 2GT 6mm belt pulley for Ender 3, GT2 synchronous wheel CNC, 2GT timing pulley with keyway bore.
Choose the exact tooth count to match your drive ratio — from compact 28T for high-speed axes to 50T for torque-multiplying reductions.
Standard round bores from 4mm to 15mm plus keyway options (3mm, 4mm, 5mm keyways) accommodate NEMA 17, NEMA 23, and custom shafts.
The 2mm tooth pitch provides fine positional resolution ideal for 3D printing and CNC work where sub-millimeter accuracy matters.
Lightweight yet rigid aluminum body keeps rotational inertia low while resisting deformation under continuous belt tension loads.
Positive tooth engagement eliminates the slip and backlash of friction drives, ensuring every motor step translates directly to belt movement.
Standard round-bore variants include set screw holes for secure shaft clamping. Keyway variants provide additional rotational locking for high-torque applications.
| Belt Profile | 2GT (GT2) |
|---|---|
| Belt Width | 6mm (0.24 in) |
| Tooth Pitch | 2mm |
| Teeth Count | 28 / 30 / 32 / 34 / 35 / 36 / 38 / 40 / 42 / 44 / 45 / 46 / 48 / 50 |
| Bore Diameter | 4mm / 5mm / 6mm / 6.35mm / 8mm / 10mm / 12mm / 12.7mm / 14mm / 15mm |
| Keyway Options | 3mm, 4mm, 5mm (select bore sizes) |
| Material | Aluminum Alloy |
| Finish | See variant options |
| Outer Diameter | See variant options |
| Hub Width | See variant options |
| Set Screw | Included (standard bore variants) |
| Compatible Belt | 2GT / GT2 6mm open or closed loop belt |
The tooth count determines your drive ratio and belt speed. For 3D printer X/Y axes, 20T is common on the motor side, but 28–40T pulleys are used on idler or reduction stages. For CNC routers, match the tooth count to your desired step-per-mm value based on your stepper motor's steps/rev and microstepping setting. A higher tooth count gives more belt contact and smoother motion at the cost of a larger pulley diameter.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select Bore 5mm for a direct fit. If your motor has a D-cut shaft, the set screw will engage the flat. For NEMA 23 motors, the shaft is typically 6.35mm (1/4 in) or 8mm — choose the matching bore size accordingly.
Keyway bores are recommended for high-torque or high-speed applications where a set screw alone may slip over time. The key provides a positive mechanical lock between the shaft and pulley, preventing rotational slippage. If your drive shaft already has a machined keyway slot, select the matching keyway variant (3mm, 4mm, or 5mm) to ensure a secure fit.
Yes. The 2GT and GT2 profiles are functionally identical — both use a 2mm pitch curvilinear tooth form and are fully interchangeable. These pulleys work with any standard 6mm-wide GT2 or 2GT open-end or closed-loop timing belt.
Aluminum alloy pulleys are well-suited for the belt tensions typical in 3D printers, light CNC routers, and desktop robotics. The material provides a good balance of low rotational inertia and sufficient rigidity. For very high-load industrial applications with sustained heavy tension, consider whether a steel pulley may be more appropriate for your specific load case.
Most Cartesian and CoreXY 3D printers use 2GT / GT2 6mm belts with 5mm motor shafts. Select Bore 5mm and the tooth count that matches your printer's original pulley. Common replacements are 20T for motor pulleys, but if you are upgrading or building a custom motion system, verify the tooth count against your printer's belt path geometry. Contact us if you need help confirming compatibility with your specific machine.
Standard round-bore variants include set screw(s) for shaft retention. A hex key (Allen wrench) for the set screw is typically included. Keyway variants rely on the key for primary retention and also include a set screw as a secondary lock. If you need additional hardware, please contact us to confirm what is included with your specific variant.
