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When belt slippage 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 automation builders who need reliable synchronous drive in compact, high-tooth-count configurations will find this 2GT timing pulley series purpose-built for the task.
Each pulley is machined from aluminum alloy and features a 2GT (GT2) tooth profile compatible with standard 6mm-wide timing belts. Teeth counts range from 52 to 72 teeth, and bore diameters span 5mm to 25mm (approximately 0.20 in to 0.98 in), with select variants offering a precision-cut keyway for positive shaft engagement. Hub width is typically 7mm, and the outer diameter scales proportionally with tooth count.
Typical use cases include 2GT timing pulley for 3D printer extruder upgrade, CNC router axis drive pulley replacement, and robotics synchronous belt drive systems requiring 52-tooth to 72-tooth GT2 pulleys with custom bore sizing.
Available in 52, 54, 56, 58, 60, 62, 64, 65, 66, 68, 70, and 72 teeth — covering a broad gear-ratio spectrum for motion control applications.
Bore sizes from 5mm to 25mm (≈0.20–0.98 in) accommodate a wide range of motor and drive shafts without custom machining.
Select bore sizes include a precision keyway (3mm, 4mm, 5mm, 6mm, or 8mm) for positive torque transmission and zero shaft slip under load.
The 2mm-pitch GT2 tooth geometry delivers low backlash and smooth engagement with standard 6mm 2GT belts used in 3D printers, CNC machines, and robotics.
Lightweight yet rigid aluminum body resists deformation under continuous belt tension, maintaining dimensional accuracy over extended duty cycles.
Hub width is typically 7mm across the range, simplifying belt alignment and pulley swaps within the same drive assembly.
| Belt Type | 2GT / GT2 |
|---|---|
| Belt Width | 6mm (0.24 in) |
| Tooth Pitch | 2mm |
| Teeth Count | 52 / 54 / 56 / 58 / 60 / 62 / 64 / 65 / 66 / 68 / 70 / 72 |
| Bore Diameter | 5mm – 25mm (see variant options) |
| Keyway | See variant options (3mm / 4mm / 5mm / 6mm / 8mm available) |
| Hub Width | Typically 7mm |
| Material | Aluminum alloy |
| Finish | Natural anodized / machined |
| Outer Diameter | See variant options (scales with tooth count) |
| Flange | See variant options |
The teeth count determines your drive ratio. Pair this pulley with a smaller driver pulley (e.g., 20T) to achieve a step-down ratio, or use matched counts for 1:1 speed. Higher tooth counts (60–72T) produce larger pitch diameters and are suited for slower, higher-torque axes. Lower counts (52–56T) are common in faster, lighter-load applications such as 3D printer extruder drives.
Measure your motor or drive shaft diameter precisely with calipers. Select the bore that matches your shaft — common sizes include 5mm (NEMA 17 motors), 6mm, 8mm, 10mm, and 12mm. If your shaft has a flat or keyway, choose a keyway variant to prevent rotational slip under load.
For light-duty or low-torque applications (e.g., 3D printer extruder), a plain bore secured with a set screw is typically sufficient. For CNC routers, robotics, or any application with significant torque or reversing loads, a keyway variant provides positive mechanical engagement and eliminates shaft slip over time.
Yes. The 2GT tooth profile is an industry-standard geometry. These pulleys are compatible with any standard 6mm-wide GT2 / 2GT timing belt regardless of brand, as long as the belt pitch is 2mm and the width is 6mm.
Aluminum alloy provides a good strength-to-weight ratio for synchronous belt drives operating at typical 3D printer and light CNC loads. For very high-tension or heavy industrial applications, verify that the belt tension does not exceed the structural limits of the pulley bore wall — particularly for smaller bore sizes with thin walls.
Aluminum naturally forms a protective oxide layer that resists light corrosion. For consistently humid, wet, or chemically exposed environments, consider applying a light coating of corrosion-inhibiting lubricant to the bore and hub surfaces. The anodized finish on the outer body provides additional surface protection.
Yes. Many popular FDM 3D printers use 2GT / GT2 6mm belts on their X and Y axes, as well as extruder drives. Select the teeth count and bore size that match your printer's existing drive system. The 52T–72T range is particularly useful for extruder gear ratio upgrades or custom motion system builds.
