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When a motion system loses steps or skips under load, the culprit is often an undersized or poorly matched drive pulley. Makers, engineers, and CNC builders who need reliable, repeatable linear motion require GT2 2GT timing belt pulleys that hold tight tolerances across a wide range of shaft sizes and tooth counts — without forcing a custom machining order.
These GT2 2GT timing belt pulleys feature a stepped hub design machined from aluminum alloy, with a 2 mm pitch profile compatible with standard 2GT open-loop and closed-loop belts. Bore options span 6 mm to 25 mm (approximately 0.24 in to 0.98 in), and tooth counts range from 72T to 100T, covering pitch diameters from roughly 45.8 mm (1.80 in) for 72T up to approximately 63.7 mm (2.51 in) for 100T. Belt width compatibility covers both 6 mm and 10 mm (0.24 in and 0.39 in) belts depending on the variant selected.
Typical use cases include large-format 3D printer drive systems where high tooth count reduces belt wrap angle stress, CNC router axis drives requiring a larger reduction ratio without an additional idler stage, and automated conveyor or pick-and-place systems where consistent pitch engagement across a wide bore range simplifies shaft sourcing. Long-tail applications include GT2 pulley for CoreXY large format printer, 2GT 80T drive pulley CNC router, and stepped hub timing pulley 6mm belt 3D printer upgrade.
Bore options from 6 mm to 25 mm (0.24–0.98 in) accommodate metric and imperial shafts including 6.35 mm (1/4 in) and 12.7 mm (1/2 in) sizes, reducing the need for adapters.
Four tooth count options — 72T, 80T, 90T, and 100T — let you dial in the exact pitch diameter and reduction ratio your drive system requires without custom machining.
The integrated step on the hub provides a positive axial stop for the belt, keeping it tracking straight under dynamic loads and reducing edge wear on the belt.
Machined to the 2GT / GT2 tooth profile standard, ensuring smooth, low-backlash engagement with compatible belts across the full tooth count range.
Available in configurations for both 6 mm and 10 mm belt widths within the same tooth count family, so you can match your existing belt stock without switching pulley families.
Machined from aluminum alloy for a balance of low rotational inertia and sufficient rigidity for continuous-duty motion applications in 3D printing, CNC, and light automation.
| Belt Model | 2GT / GT2 |
|---|---|
| Belt Pitch | 2 mm |
| Tooth Count Options | 72T / 80T / 90T / 100T |
| Bore Diameter Range | 6 mm – 25 mm (0.24 in – 0.98 in) |
| Applicable Belt Width | 6 mm or 10 mm (see variant options) |
| Hub Style | Stepped hub |
| Material | Aluminum alloy |
| Pitch Diameter (72T) | Approx. 45.8 mm (1.80 in) |
| Pitch Diameter (80T) | Approx. 50.9 mm (2.00 in) |
| Pitch Diameter (90T) | Approx. 57.3 mm (2.26 in) |
| Pitch Diameter (100T) | Approx. 63.7 mm (2.51 in) |
| Bore & Belt Width | See variant options |
| Quantity | 1 piece per order |
Tooth count determines the pitch diameter of the pulley, which directly affects your drive ratio and belt wrap angle. A higher tooth count (e.g., 100T) gives a larger pitch diameter, which is useful when you need a reduction ratio without a secondary stage, or when you want to reduce belt tension for a given torque. For most large-format 3D printer and CNC router builds, 72T–80T covers the majority of standard drive configurations. Check your motion system's design spec or belt loop length before selecting.
A 1/4-inch shaft measures 6.35 mm. Select the 6.35 mm bore variant to get a close fit. Avoid using a 6 mm bore on a 6.35 mm shaft as forcing an undersized bore can damage both the pulley and the shaft.
The belt width dimension refers to the width of the timing belt the pulley is designed to guide. A 6 mm belt width variant has a narrower groove and flanges suited for 6 mm wide 2GT belts, while the 10 mm variant accommodates wider 10 mm 2GT belts. Wider belts generally carry higher tension loads, making 10 mm variants preferable for heavier gantry or high-torque CNC axis applications.
Yes. The GT2 and 2GT designations refer to the same 2 mm pitch curvilinear tooth profile. These pulleys are compatible with belts labeled either GT2 or 2GT from standard suppliers. Always verify the belt pitch (2 mm) and width match your selected variant.
The stepped hub creates a raised shoulder on one or both sides of the pulley body that acts as a belt guide flange. This keeps the belt from walking off the pulley laterally during operation, which is especially important on longer belt runs or when the belt is under varying tension. For most 3D printer and CNC applications, a stepped hub is recommended over a plain (no-flange) pulley for improved tracking reliability.
These pulleys are typically secured using one or two set screws threaded into the hub that clamp against the shaft. For best holding force, align one set screw over a flat on the shaft if available. Tighten set screws with the appropriate hex key to the recommended torque for the screw size — over-tightening can strip the threads in the aluminum hub.
Aluminum alloy offers moderate natural corrosion resistance due to its oxide layer, but it is not rated for prolonged exposure to salt spray, strong acids, or high-humidity outdoor environments without additional surface treatment. For indoor 3D printing and CNC workshop use, no additional treatment is typically required. For outdoor or high-humidity applications, consider applying a light protective coating or selecting a stainless steel alternative.
Belt length depends on the center distance between your drive and driven pulleys plus the pitch circumferences of both pulleys. Use the formula: Belt Length ≈ 2 × Center Distance + π × (PD1 + PD2) / 2, where PD is the pitch diameter. For a 72T pulley, PD ≈ 45.8 mm; for 100T, PD ≈ 63.7 mm. Online belt length calculators for GT2/2GT profiles can simplify this calculation once you know your center distance.
