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When a skipped tooth or misaligned belt ruins a 20-hour print or throws off a CNC cut, the root cause is almost always a worn or imprecise pulley. Engineers, makers, and repair technicians who depend on repeatable motion control need a GT2 timing pulley they can trust across thousands of cycles. This listing covers the full GT2 16–80T synchronous wheel range so you can match the exact tooth count and bore diameter your build demands.
Each pulley is machined from aluminum alloy with a natural silver finish and is designed for GT2 profile 6mm-wide open or closed timing belts. Tooth counts span 16T to 80T, and bore diameters range from 3.17mm (~0.125 in) to 14mm (~0.551 in), covering the most common motor shaft sizes used in desktop motion systems. Set-screw clamping secures the pulley to the shaft without adhesive.
Typical applications include Cartesian and CoreXY 3D printer X/Y axis drives, desktop CNC router feed systems, laser engraver gantry assemblies, and lightweight robotic arm joints — anywhere a GT2 6mm belt synchronous wheel gear is required for low-backlash linear or rotary motion.
Available in 16T, 20T, 48T, 60T, and 80T configurations, giving you the gear ratio flexibility needed for both high-speed and high-torque motion profiles.
Bore options from 3.17mm to 14mm (including 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, and 14mm) cover virtually every common stepper and servo motor shaft diameter.
Lightweight yet rigid aluminum body keeps rotational inertia low while maintaining dimensional stability under continuous belt tension — critical for accurate layer positioning in 3D printing.
The 2mm pitch GT2 tooth profile delivers smooth, low-noise belt engagement and minimal backlash, making it the industry standard for desktop motion control systems.
M4 grub screws (included accessory option available) lock the pulley securely to the motor shaft without requiring adhesive or press-fit tooling, enabling quick field replacement.
Dimensioned to match OEM pulleys on popular 3D printer platforms (Ender, Prusa-style, Voron, RatRig, and similar), reducing downtime when replacing worn synchronous wheel gears.
| Belt Profile | GT2 (2mm pitch) |
|---|---|
| Belt Width | 6mm |
| Tooth Count Options | 16T, 20T, 48T, 60T, 80T |
| Bore Diameter Options | 3.17mm, 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 14mm |
| Material | Aluminum alloy |
| Finish | Natural anodized / silver |
| Shaft Fixing Method | Set screw (M4 grub screw) |
| Flange | See variant options |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Weight (per piece) | See variant options |
| Application | 3D printers, CNC routers, laser engravers, robotics |
Tooth count determines your drive ratio and belt speed. Smaller pulleys (16T–20T) are typically used on motor shafts for high-speed, lower-torque applications like 3D printer X/Y axes. Larger pulleys (48T–80T) are used as driven pulleys or where a speed reduction is needed. Match your tooth count to your existing belt loop length and the pulley on the opposite shaft to maintain correct belt tension.
Standard NEMA 17 stepper motors have a 5mm output shaft diameter. Select the 5mm bore option. If your motor has a D-cut or flat on the shaft, the set screw will engage the flat for a more secure grip. For NEMA 23 motors, the shaft is typically 6.35mm or 8mm — check your motor datasheet before ordering.
Yes. The GT2 2mm pitch tooth profile is identical whether used with open-ended or closed-loop GT2 belts. Ensure the belt width is 6mm to match these pulleys. Using a wider or narrower belt will cause misalignment and accelerated wear.
When properly torqued against a clean, burr-free shaft, M4 set screws provide sufficient clamping force for typical 3D printer and light CNC loads. For higher-torque applications, select a bore with a D-flat shaft and align the set screw to the flat. Applying a small amount of thread-locking compound to the set screw threads further reduces the risk of loosening under vibration.
The aluminum alloy body offers good resistance to oxidation in typical indoor workshop conditions. The natural anodized finish adds a thin protective layer. Avoid prolonged exposure to cutting fluids, salt spray, or highly acidic environments, which can degrade the surface over time. For outdoor or high-humidity enclosures, consider applying a light protective coating.
These are drive pulleys designed to be fixed to a rotating shaft. They are not designed as idler pulleys, which typically require a smooth bore and a bearing insert. Using a drive pulley as an idler without a bearing will cause shaft wear and inconsistent belt tension. For idler applications, use a dedicated smooth idler pulley with an integrated bearing.
This accessory variant provides a pack of 10 M4 grub screws (set screws) and one spanner/hex key tool — useful for replacing lost set screws or stocking spares when maintaining multiple machines. It does not include a pulley body; select a tooth count and bore variant if you need the pulley itself.
