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When your motion-control build demands repeatable, slip-free power transfer, a mismatched or worn pulley becomes the weakest link in the chain. Engineers, makers, and automation builders who rely on GT2 belt drives need a pulley that holds tight tolerances across every tooth — whether they're tuning a CoreXY 3D printer, dialing in a CNC router axis, or assembling a compact robotic arm joint.
These GT2 timing pulleys are machined from aluminum alloy with a natural anodized finish. Each pulley features a 2 mm pitch GT2 tooth profile, a 6 mm tooth width, and a bore range of 4 mm to 25 mm (approximately 0.16 in to 0.98 in). The tooth count spans 28 to 60 teeth, giving pitch circle diameters from roughly 17.8 mm (0.70 in) for 28T up to approximately 38.2 mm (1.50 in) for 60T. A set screw secures the pulley to the shaft.
Typical use cases include GT2 belt-driven CNC router X/Y axes, 3D printer extruder and motion systems using GT2 open-loop or closed-loop belts, and lightweight robotic arm joints requiring low-backlash synchronous drive. The wide bore selection — from 4 mm stepper motor shafts up to 25 mm servo shafts — makes these pulleys compatible with a broad range of drive shafts used in DIY automation projects.
Covers a wide gear-ratio spread in a single product family — choose fewer teeth for higher speed or more teeth for increased torque in your GT2 drive system.
Accommodates shafts from small stepper motors (4 mm) up to larger servo or DC motor shafts (25 mm), eliminating the need for adapters in most builds.
The GT2 tooth geometry minimizes backlash and belt skip under load, delivering the positional accuracy that CNC and 3D-printing applications demand.
Matched to standard 6 mm GT2 belts — the most common width in desktop CNC and FDM 3D printer motion systems — for direct drop-in compatibility.
Each pulley includes a set screw bore for secure shaft locking. Prevents rotational slip during rapid direction changes and high-acceleration moves.
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — critical for responsive motion in high-speed CNC and 3D printer applications.
| Belt Profile | GT2 (2 mm pitch) |
|---|---|
| Tooth Count | 28 / 30 / 32 / 34 / 35 / 36 / 38 / 40 / 42 / 44 / 45 / 46 / 48 / 50 / 52 / 54 / 56 / 58 / 60 Teeth |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 25 mm |
| Tooth Width | 6 mm |
| Belt Width Compatibility | 6 mm GT2 belt |
| Material | Aluminum alloy |
| Shaft Retention | Set screw |
| Pitch Circle Diameter (28T) | Approx. 17.8 mm (0.70 in) |
| Pitch Circle Diameter (60T) | Approx. 38.2 mm (1.50 in) |
| Quantity per Order | 1 piece |
Tooth count determines the pitch circle diameter and your drive ratio. Fewer teeth (e.g., 28T) give a smaller pulley diameter and higher belt speed for a given RPM, while more teeth (e.g., 60T) increase torque multiplication. For most desktop CNC and 3D printer motion systems, 20T driver + 40T driven is common, but this listing lets you select the driven pulley from 28T to 60T to dial in your exact ratio.
Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a flat (D-shaft), the set screw will seat against the flat for a more secure grip. For NEMA 23 motors, the shaft is typically 6.35 mm or 8 mm — check your motor's datasheet before ordering.
Yes. The GT2 2 mm pitch tooth profile is identical for both open-loop and closed-loop GT2 belts. As long as your belt is 6 mm wide and uses the GT2 profile, this pulley will mesh correctly. Verify the belt's inner circumference matches your axis travel requirements when using closed-loop belts.
Aluminum alloy pulleys are well-suited for the belt tensions typical in desktop CNC routers, 3D printers, and light robotic joints. For heavy-duty industrial applications with sustained high belt tension (above approximately 50–80 N), consider whether a steel pulley is more appropriate. For the vast majority of DIY and maker-grade motion systems, aluminum provides an excellent balance of strength and low rotational inertia.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For prolonged exposure to moisture, salt spray, or outdoor conditions, applying a light coat of machine oil or using an anodized variant is advisable. The set screw is typically steel — apply a small amount of anti-seize compound if corrosion is a concern.
Tooth width must match your belt width. This pulley is designed for 6 mm wide GT2 belts — the standard width used in most desktop 3D printers (e.g., Ender, Prusa, Voron) and small CNC routers. If your machine uses 10 mm wide GT2 belts (common in larger-format or higher-load CNC builds), you will need a 10 mm tooth width pulley instead. Mixing widths causes uneven belt tracking and accelerated wear.
Yes. The pulley functions identically whether mounted on the motor shaft (driver) or on an idler/output shaft (driven). The set screw secures it to any shaft within the listed bore range. For idler applications without a shaft, a flanged bearing insert is typically used — this pulley does not include a bearing and is intended for shaft mounting only.
