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When your 3D printer skips steps or your CNC router loses position mid-cut, the culprit is often a worn or mismatched timing pulley. Engineers, makers, and automation technicians who demand repeatable motion need a synchronous wheel that holds tooth engagement under load without backlash. This 2GT timing pulley synchronous wheel is engineered for exactly that — delivering consistent, slip-free power transmission across a wide range of drive configurations.
Each pulley is machined from aluminum alloy with a natural or anodized finish, featuring a 2GT (GT2) tooth profile and a 10mm belt width. Teeth count options span 80 to 120 teeth, with outer diameters ranging from approximately 51mm (2.0 in) for 80T up to approximately 76mm (3.0 in) for 120T. Bore sizes cover 5mm through 25mm (0.20–0.98 in), with keyway variants available for positive shaft locking.
Typical use cases include FDM 3D printer Z-axis and extruder drives, CNC router axis pulleys requiring low-backlash 2GT belt drive synchronous wheel setups, and light industrial conveyor or indexing systems where a timing pulley replacement with keyway bore is needed for torque-critical shafts.
| Belt Profile | 2GT (GT2), 2mm pitch |
|---|---|
| Belt Width | 10mm |
| Teeth Number | 80 / 90 / 100 / 110 / 120 Teeth (see variant options) |
| Outer Diameter (approx.) | ~51mm (80T) to ~76mm (120T) / ~2.0–3.0 in |
| Bore Size | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 25mm |
| Keyway Options | 3mm / 4mm / 5mm / 6mm / 8mm (see variant options) |
| Hub Type | Set-screw (plain bore) / Keyway (keyed bore) |
| Material | Aluminum alloy |
| Flange | See variant options |
| Weight | See variant options |
The teeth number determines the pulley's pitch diameter and, combined with your motor pulley, sets the drive ratio. For 3D printers, 80T is common on Z-axis lead-screw alternatives, while larger counts (100–120T) suit slower, higher-torque conveyor or indexing drives. Match the teeth count to your required linear resolution and belt loop length.
Most NEMA 17 stepper motors have a 5mm output shaft. Select Bore 5mm for a direct fit. If your motor has a flat (D-cut) shaft, the set-screw will engage the flat for a secure hold. For a keyed shaft, choose the matching keyway variant.
Plain bore pulleys use one or two set-screws to clamp onto the shaft — suitable for light-to-medium loads and easy repositioning. Keyway bore pulleys include a machined slot that mates with a key on the shaft, providing positive torque transmission with no rotational slip. Choose keyway variants for reversing loads, high torque, or applications where set-screw loosening is a concern.
Yes. The 2GT tooth profile is dimensionally identical to the GT2 standard (2mm pitch, curvilinear tooth form). This pulley is compatible with any 10mm-wide 2GT or GT2 timing belt regardless of brand, as long as the pitch and width match.
Aluminum alloy provides a good strength-to-weight ratio for typical CNC router and 3D printer belt drive loads. For very high-torque industrial applications exceeding the aluminum's yield point, consider a steel pulley instead. For standard hobby CNC and FDM printing, aluminum is the industry-standard material choice.
This pulley is designed and optimized for 10mm-wide 2GT belts. Using it with a narrower belt is not recommended — the belt may track unevenly and wear prematurely. For 6mm belt applications, select a pulley specifically rated for 6mm belt width.
Keyway dimensions follow standard metric key standards. As a general guide: 8mm shaft → 3mm key, 10mm shaft → 3mm or 4mm key, 12–14mm shaft → 4–5mm key, 16–20mm shaft → 5–6mm key, 25mm shaft → 8mm key. Always verify against your shaft's actual keyway slot width before ordering.
