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When belt slip or inconsistent motion ruins a print or throws off a CNC cut, the root cause is often an undersized or poorly matched timing pulley. Makers, engineers, and machine builders who need repeatable, low-backlash motion depend on correctly specified 2GT synchronous wheels to keep their systems running true.
These 2GT timing pulleys feature a 2mm pitch profile machined from aluminum alloy, available in 14 to 30 tooth counts and two belt widths — 7mm (for 6mm belts) and 11mm (for 10mm belts). Bore options span 3mm to 15mm, including plain round bores and keyway variants (Bore 8 Keyway 3mm, Bore 10 Keyway 3mm/4mm, Bore 12 Keyway 4mm) for positive shaft locking. Outer diameter ranges from approximately 9mm (14T) to approximately 19mm (30T).
Typical applications include 3D printer X/Y axis drives (CoreXY, Cartesian, delta), desktop CNC router feed axes, robotic arm joint drives, and compact conveyor systems where a 2GT synchronous wheel with a matched bore keeps positioning accurate across thousands of cycles.
| Belt Pitch | 2mm (2GT / GT2) |
|---|---|
| Tooth Count | 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T |
| Belt Width Compatibility | 6mm belt (7mm teeth width) / 10mm belt (11mm teeth width) |
| Bore Diameter | 3mm, 3.175mm, 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm |
| Keyway Options | Bore 8 Keyway 3mm / Bore 10 Keyway 3mm / Bore 10 Keyway 4mm / Bore 12 Keyway 4mm |
| Material | Aluminum alloy |
| Outer Diameter (approx.) | See variant options (scales with tooth count) |
| Hub Retention | Set screw (keyway variants: set screw + keyway) |
| Weight | See variant options |
Tooth count determines the pitch diameter and, combined with your motor's RPM, the linear speed of the belt. Smaller tooth counts (14T–18T) suit high-speed, low-torque axes like 3D printer X/Y. Larger counts (24T–30T) increase torque multiplication and reduce belt tension for heavier loads. Match the tooth count on both the drive and idler/driven pulleys to maintain the correct gear ratio.
The teeth width refers to the usable belt contact surface between the flanges. The 7mm option is designed for standard 6mm-wide 2GT belts; the 11mm option is designed for 10mm-wide 2GT belts. Using a wider belt increases load capacity and reduces the risk of belt tracking off the pulley under lateral forces.
For light-duty applications such as 3D printer axes, a plain bore with a set screw is typically sufficient. For higher-torque applications — stepper-driven CNC axes, conveyor drives, or any setup where the shaft reverses direction under load — a keyway bore provides positive mechanical engagement and prevents the pulley from rotating on the shaft under shock loads.
Yes. The 2GT profile is dimensionally equivalent to the GT2 profile used by most belt manufacturers. These pulleys will mesh correctly with any standard 2mm-pitch GT2 or 2GT open or closed-loop belt of the matching width (6mm or 10mm).
Use a digital caliper to measure the shaft diameter at the point where the pulley will sit. Select the bore size that matches your shaft diameter. If your shaft is an imperial size (e.g., 1/4" = 6.35mm, 1/2" = 12.7mm), choose the corresponding metric-equivalent bore listed in the variant options.
These pulleys are machined from aluminum alloy, which forms a natural oxide layer that resists corrosion in typical indoor environments (workshops, labs, enclosed machines). They are not recommended for prolonged exposure to salt spray or highly acidic/alkaline environments without additional surface treatment.
These are drive pulleys with teeth intended to engage a toothed belt. For smooth idler use (belt back-side contact), a smooth idler pulley or bearing is more appropriate. However, toothed pulleys can function as idlers on the toothed side of the belt if the belt path requires it.
