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When a slipping or misaligned belt drive throws off your motion system, the culprit is often an undersized or poorly toleranced pulley. Engineers, makers, and machine builders who rely on repeatable linear or rotary motion need a pulley that holds tight tolerances and fits their shaft without play. This 20-tooth 2GT/GT2 timing pulley is machined to match the GT2 tooth profile exactly, giving you smooth, backlash-minimized power transfer every time.
Each pulley features a 20-tooth GT2/2GT tooth profile designed for use with 10mm-wide timing belts. The body is typically machined from aluminum alloy, offering a balance of light weight and rigidity. Bore options span 3 mm (~0.118 in), 5 mm (~0.197 in), 6 mm (~0.236 in), 6.35 mm (~0.250 in / ¼ in), and 8 mm (~0.315 in), with a set screw for secure shaft locking. Overall pulley outer diameter is typically 15–16 mm (~0.59–0.63 in).
This pulley is a go-to component for 3D printer X/Y axis belt drive systems, CNC router gantry drives requiring precise 2GT belt timing pulley replacement, and robotics or automation rigs where a compact 20T GT2 pulley with multiple bore sizes keeps build flexibility high.
Precisely cut 2GT tooth geometry ensures full engagement with GT2 belts, minimizing backlash and maintaining positional accuracy in demanding motion control applications.
Available in 3, 5, 6, 6.35, and 8 mm bore diameters to fit a wide range of motor and shaft standards — including the common ¼-inch (6.35 mm) imperial shaft size.
Flanged pulley body is sized specifically for 10mm-wide 2GT/GT2 timing belts, keeping the belt tracked and preventing lateral drift during operation.
Includes a grub/set screw for positive shaft retention. Prevents rotational slippage under load without requiring adhesive or press-fit assembly.
Machined aluminum body keeps rotating mass low — important for high-acceleration axes in 3D printers and CNC machines where inertia affects print or cut quality.
Standard 2GT tooth pitch and flange dimensions make this a direct drop-in replacement for worn or damaged pulleys on Ender, Voron, RatRig, and similar open-source machine platforms.
| Belt Profile | 2GT / GT2 |
|---|---|
| Number of Teeth | 20T |
| Belt Width | 10 mm (0.394 in) |
| Bore Diameter Options | 3 mm / 5 mm / 6 mm / 6.35 mm / 8 mm |
| Tooth Pitch | 2 mm |
| Outer Diameter (approx.) | 15–16 mm (0.59–0.63 in) |
| Material | Aluminum alloy |
| Shaft Lock | Set screw (grub screw) |
| Flange | Yes (both sides) |
| Weight (per piece, approx.) | See variant options |
| Finish | Natural / anodized aluminum |
Most NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. If your motor has a D-shaft, the set screw will engage the flat for a secure lock. For NEMA 23 motors, the shaft is typically 6.35 mm or 8 mm — check your motor's datasheet before ordering.
Yes. The 2GT tooth profile is an open standard. This pulley is compatible with any GT2 / 2GT timing belt with a 2 mm pitch and 10 mm width, regardless of brand. It works with both open-loop belts and closed-loop GT2 belts of the appropriate length.
Yes. The Ender 3 and most Cartesian-style 3D printers use 20T GT2 pulleys with a 5 mm bore on their X and Y axes. This pulley is a direct replacement. Verify your belt width is 10 mm before purchasing — some machines use 6 mm belts, which require a different pulley.
The set screw provides reliable shaft retention for typical 3D printing and light CNC loads. For best results, tighten the set screw against the flat of a D-shaft if available, and use a small amount of thread-locking compound for high-vibration environments. For heavy industrial torque loads, a keyed shaft arrangement is recommended.
Aluminum alloy naturally forms a thin oxide layer that provides good resistance to moisture and mild corrosion. For indoor workshop, 3D printer, or CNC environments this is more than adequate. If used in humid or outdoor conditions, an anodized finish variant offers additional protection.
Yes, 2GT and GT2 refer to the same tooth profile standard — a 2 mm pitch curvilinear tooth geometry. The naming convention varies by manufacturer but the dimensions are interchangeable. This pulley is fully compatible with belts labeled either GT2 or 2GT.
A 20-tooth pulley with 2 mm pitch moves the belt 40 mm per revolution (20 × 2 mm). This is the most common configuration for 3D printer axes and light CNC drives. If you need finer resolution, use a smaller pulley (e.g., 16T = 32 mm/rev). If you need more speed or torque multiplication, pair with a larger driven pulley.
