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When your motion system demands consistent belt tracking and slip-free power transfer, a poorly matched pulley becomes the weakest link. These aluminum V-grooved pulleys are designed for hobbyists, makers, and small-scale machine builders who need a reliable, dimensionally accurate drive wheel for O-round and round-section belts up to 6mm in width.
Each pulley is machined from aluminum alloy with a clean V-groove profile sized to seat a 6mm O-round belt securely. Outer diameters range from 20mm to 100mm (approximately 0.79 in to 3.94 in), with center bore options from 5mm to 25mm (approximately 0.20 in to 0.98 in) to fit a wide range of shaft sizes. The lightweight aluminum construction keeps rotating mass low while providing adequate rigidity for moderate-load applications.
Typical use cases include 3D printer filament drive and extruder assemblies, CNC router axis belt drives, DIY conveyor and indexing systems, and small robotic arm joint mechanisms — anywhere a compact, low-inertia V-groove pulley for round belt drives is needed.
| Material | Aluminum alloy |
|---|---|
| Groove Type | V-groove (O-round / round belt) |
| Belt Width Compatibility | 6mm |
| Outer Diameter (OD) Range | 20mm – 100mm (0.79 in – 3.94 in) |
| Bore Diameter Range | 5mm – 25mm (0.20 in – 0.98 in) |
| OD × Bore (per variant) | See variant options |
| Finish | See variant options |
| Quantity per Order | 1 Pcs |
| Weight | See variant options |
The outer diameter (OD) determines your drive ratio and belt speed. A larger OD pulley on the driven shaft increases output speed; a smaller OD reduces it. Calculate your target ratio by dividing the driver OD by the driven OD. For most 3D printer and light CNC applications, ODs in the 20–40mm range are common on the motor side.
Measure your shaft diameter with calipers and select the matching bore. Common stepper motor shaft diameters are 5mm and 8mm; servo shafts vary from 6mm to 12mm. If your shaft is between listed bore sizes, select the next size up and use a shaft collar or sleeve to take up the gap.
These pulleys are specifically profiled for O-round (circular cross-section) belts up to 6mm in width. Flat belts, V-belts with trapezoidal profiles, or toothed timing belts are not compatible with this groove geometry. Using an incompatible belt type will result in poor tracking and accelerated wear.
Aluminum alloy pulleys offer a good balance of strength and weight for light-to-moderate loads. They are significantly stronger and more dimensionally stable than printed plastic pulleys, and lighter than steel equivalents. For high-torque or heavy-load industrial applications, steel pulleys may be more appropriate. For hobbyist CNC, 3D printing, and robotics, aluminum is the standard choice.
Aluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid or outdoor environments, an anodized finish provides additional protection. Check the variant listing for finish details. Avoid prolonged contact with strong acids or alkalis.
Securing method depends on the specific variant and your application torque. For low-torque applications, a friction fit or shaft collar may suffice. For higher torque, a set screw is recommended. Keyway availability varies by size — refer to the variant description or contact us to confirm before ordering if this is a critical requirement.
Yes. The compact OD options (20–30mm) and small bore sizes (5–8mm) are well-suited for extruder motor shafts and filament drive assemblies. The V-groove profile grips O-round belts reliably, making these a practical upgrade over printed plastic pulleys in direct-drive and Bowden extruder configurations.
