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When your 3D printer skips steps, your CNC router loses position, or your robotic arm drifts out of sync, the culprit is often a worn or mismatched timing pulley. Engineers, makers, and repair technicians who need a reliable drop-in GT2 6mm timing belt pulley — in exactly the tooth count and bore diameter their build demands — will find the full range here, from compact 16T hubs to large 120T wheels.
These GT2 6mm timing belt pulleys are machined from aluminum alloy with a natural or anodized finish. The belt groove pitch is 2mm (GT2 standard), belt width compatibility is 6mm, and bore diameters span 4mm to 25mm across the variant range. Tooth counts run from 16T to 120T. Boss styles include Small Boss and Large Boss configurations depending on the tooth count selected. Set screws are included for shaft retention.
Typical use cases include FDM 3D printer X/Y axis drives (GT2 belt + pulley systems), desktop CNC router belt drives, laser engraver gantry systems, and lightweight robotic arm joint drives where low backlash and repeatable positioning are required.
| Belt Type | GT2 (2mm pitch) |
|---|---|
| Belt Width | 6mm |
| Tooth Count | 16T – 120T (see variant options) |
| Bore Diameter | 4mm – 25mm (see variant options) |
| Boss Style | Small Boss / Large Boss (varies by tooth count) |
| Material | Aluminum alloy |
| Shaft Retention | Set screw included |
| Quantity per Order | 1PCS |
| Weight | See variant options |
Tooth count determines your drive ratio and linear travel per motor step. For most 3D printer X/Y axes, 20T is the standard choice with a GT2 belt, giving approximately 40mm of travel per motor revolution. Higher tooth counts (e.g., 40T, 60T) are used on the driven side to create a gear ratio, slowing output speed while increasing torque. Match your tooth count to your existing belt loop length and axis geometry.
Standard NEMA 17 stepper motors have a 5mm output shaft diameter. Select the 5mm bore variant. 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 inch) — select the 6.35mm bore variant accordingly.
The boss refers to the hub flange that extends beyond the belt groove. A Large Boss provides a longer hub section, giving more contact area for the set screw and better shaft grip — useful in higher-torque or higher-speed applications. Small Boss pulleys are more compact and lighter, suitable for standard 3D printer and light CNC use.
Yes. These pulleys follow the GT2 2mm pitch standard and are designed for 6mm wide GT2 belts, both open-loop (sold by the meter) and closed-loop (fixed circumference loops). Ensure your belt width is 6mm — GT2 belts also come in 10mm and wider widths, which are not compatible with these 6mm-groove pulleys.
Aluminum alloy pulleys are well-suited for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in 3D printing and light CNC applications. The set screw provides secure shaft retention under normal operating loads. Avoid over-tightening the set screw, which can deform the bore on smaller sizes.
Yes. GT2 6mm timing belt pulleys are widely used in desktop laser engravers and belt-driven CNC routers. Select the tooth count that matches your existing drive system. If replacing a worn pulley, match the tooth count and bore diameter exactly to maintain your machine calibration.
Yes, set screws are included with each pulley. The set screw size is typically M3 for smaller bore pulleys and may vary for larger bore variants. A standard hex key is used for installation. Contact us to confirm the exact set screw size for a specific variant if needed.
