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When your CNC router skips steps or your 3D printer loses positional accuracy, the culprit is often a worn or mismatched pulley. Engineers, makers, and automation builders who demand repeatable, slip-free belt drive performance need a pulley that fits exactly — right tooth count, right bore, right width. These GT2 idler and drive pulleys are engineered for that precision.
Each pulley is machined from aluminum alloy with a smooth anodized finish, designed to mesh with standard GT2 profile timing belts at a 2mm pitch. The belt-contact width is 11mm (approximately 0.43 in), accommodating 10mm-wide GT2 belts with lateral clearance. Bore options span Φ4mm to Φ15mm (approximately 0.16–0.59 in), and tooth counts include 32T, 34T, 35T, 36T, 38T, and 40T. Keyway variants (K3, K4, K5) are available for shaft-locking applications.
Typical use cases include open-loop CNC axis drives requiring consistent belt tension, CoreXY and Cartesian 3D printer motion systems needing low-backlash idler routing, and lightweight robotic arm joints or conveyor belt drives where compact aluminum pulleys reduce rotational inertia.
Available in 32T, 34T, 35T, 36T, 38T, and 40T configurations to match your drive ratio and belt path geometry precisely.
Bore options from Φ4mm to Φ15mm cover most stepper motor shafts, servo shafts, and idler axle diameters used in maker and industrial builds.
Select K3, K4, or K5 keyway options for positive shaft engagement — eliminates rotational slip under load without relying solely on set screws.
Machined aluminum body keeps weight low while providing the rigidity needed for consistent belt tension across thousands of operating cycles.
The 11mm pulley width accommodates standard 10mm GT2 belts with lateral clearance, reducing edge wear and belt tracking issues.
Tooth geometry matches the GT2 standard for smooth, low-noise engagement — suitable for both drive and idler positions in open and closed belt loops.
| Belt Profile | GT2 |
|---|---|
| Belt Pitch | 2mm |
| Belt Width Compatibility | 10mm |
| Pulley Width | 11mm (0.43 in) |
| Tooth Count Options | 32T / 34T / 35T / 36T / 38T / 40T |
| Bore Diameter Range | Φ4mm – Φ15mm (0.16–0.59 in) |
| Keyway Options | None / K3 / K4 / K5 (see variant options) |
| Material | Aluminum alloy |
| Finish | Anodized |
| Outer Diameter | See variant options |
| Application | CNC, 3D printer, robotics, automation belt drives |
Tooth count determines your drive ratio and belt wrap angle. Smaller pulleys (32T–34T) are common on motor shafts for higher torque multiplication, while larger pulleys (38T–40T) are used on driven axes or as idlers to reduce belt bending stress. Match your tooth count to your existing system's gear ratio or consult your motion controller's steps-per-mm calculation.
Measure your motor or idler shaft diameter with calipers. Common stepper motor shaft sizes are 5mm and 8mm; servo shafts often run 6mm, 8mm, or 10mm. Choose the bore that matches your shaft exactly — a loose bore will cause runout and belt skip even with a set screw tightened.
Standard bore pulleys rely on a set screw to grip the shaft. Keyway variants (K3, K4, K5 — referring to the keyway width in mm) use a machined slot that mates with a matching key on the shaft, providing positive rotational locking. Keyway variants are recommended for higher-torque applications or where vibration may loosen set screws over time.
Yes — these pulleys are designed for standard GT2 profile belts with 2mm pitch and 10mm width. They are compatible with open-ended GT2 belt stock and closed-loop GT2 belts used in 3D printers and CNC machines. Verify your belt width is 10mm; 6mm-wide GT2 belts will work but will not fill the full 11mm pulley width.
Aluminum alloy pulleys offer a good balance of strength and weight for most maker and light industrial applications. They are significantly more rigid and durable than POM or nylon pulleys, and lighter than steel. For very high-torque or high-speed industrial drives, steel pulleys may be preferred, but for CNC routers, 3D printers, and robotics, aluminum is the standard choice.
The anodized aluminum finish provides good resistance to oxidation and light corrosion in typical indoor workshop or lab environments. Anodizing also adds surface hardness, reducing wear at the belt-tooth interface. For outdoor or high-humidity environments, periodic inspection is recommended.
Yes. These pulleys can be mounted on a fixed axle bolt as idlers to redirect or tension a GT2 belt. For idler use, select a bore that matches your axle bolt diameter and use a bearing insert if smooth free-spinning rotation is required. The standard (non-keyway) bore variants are typically preferred for idler applications.
