Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your 3D printer skips steps or your CNC axis drifts, the culprit is often a poorly fitted pulley. Engineers, makers, and robotics builders who demand repeatable, backlash-free motion need a GT2 timing belt pulley that fits their shaft exactly and holds position under load. These GT2 timing belt pulleys are machined to match the GT2 belt profile, eliminating the slop that causes layer shifts and positioning errors.
Each pulley is machined from aluminum alloy with a natural silver finish and features a 7mm belt-contact width. Bore options span 3mm to 15mm (0.12 in to 0.59 in), and tooth counts run from 20T to 80T — covering pitch diameters of approximately 12.7mm to 50.9mm (0.50 in to 2.00 in). Two M3 set screws secure the pulley to the shaft for a firm, slip-resistant grip.
Typical applications include Cartesian and CoreXY 3D printer X/Y axes, CNC router gantry drives, laser engraver motion systems, and lightweight robotic arm joints where a GT2 timing belt pulley with a precise bore-to-shaft fit is critical for repeatable positioning.
| Belt Type | GT2 (2mm pitch) |
|---|---|
| Belt Width | 7mm |
| Tooth Count | 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 35T, 36T, 38T, 40T, 45T, 48T, 50T, 55T, 60T, 70T, 80T |
| Bore Diameter | 3mm, 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm |
| Pitch Diameter Range | Approx. 12.7mm – 50.9mm (0.50 in – 2.00 in) |
| Material | Aluminum alloy |
| Finish | Natural silver (uncoated) |
| Shaft Locking | 2× M3 set screws |
| Flange | See variant options |
| Weight (per piece) | See variant options |
| Quantity | 1 piece per order |
The tooth count determines the pulley's pitch diameter and, combined with your motor's steps-per-revolution and microstepping setting, sets your printer's steps-per-mm. Most Cartesian and CoreXY printers use 20T drive pulleys on NEMA 17 motors with a 5mm bore. Larger tooth counts (e.g., 40T–80T) are typically used as idler or reduction pulleys. Check your printer's motion system documentation or firmware configuration to confirm the correct tooth count before ordering.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, the M3 set screw will engage the flat to prevent rotation. For other motor types or custom shafts, measure your shaft diameter with calipers before selecting a bore size.
The pulley's belt-contact surface is 7mm wide. A 6mm GT2 belt will run on this pulley with approximately 0.5mm of clearance on each side, which is acceptable for most 3D printer and CNC applications. For best tracking and load distribution, a 7mm GT2 belt is recommended. These pulleys are not designed for GT3 or HTD belt profiles.
Two M3 set screws provide a secure grip on the shaft. For smooth (non-D-cut) shafts, apply a small amount of thread-locking compound to the set screws after final positioning to prevent loosening from vibration. For D-cut shafts, align one set screw with the flat for maximum torque resistance. Under normal 3D printing and light CNC loads, the dual set screw design is sufficient to prevent slippage.
Aluminum alloy offers good corrosion resistance in typical indoor environments (3D printer enclosures, workshop conditions). The natural finish does not include anodizing, so prolonged exposure to moisture or harsh chemicals may cause surface oxidation over time. For the belt-contact surface, aluminum wears slowly against rubber GT2 belts under normal operating loads and speeds typical of desktop 3D printers and small CNC machines.
Smaller pulleys (20T–30T) are typically used as drive pulleys directly on motor shafts, providing higher belt speed per motor revolution and compact installation. Larger pulleys (40T–80T) are used as driven pulleys or idlers to create gear reduction, increase torque, or route the belt around a larger radius. If you are replacing an existing pulley, match the tooth count exactly to maintain your system's calibration. If designing a new system, calculate the required gear ratio based on your load and speed requirements.
Yes. These GT2 timing belt pulleys are suitable for laser engraver X/Y gantry systems, lightweight robotic arm joints, conveyor drives, and any application requiring synchronized, low-backlash belt drive with a 2mm GT2 pitch belt. Confirm that the bore matches your shaft diameter and that the 7mm belt width is compatible with your belt and tensioner setup.
