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When a slipping or misaligned belt derails your build mid-run, the culprit is almost always an undersized or poorly machined pulley. Engineers, makers, and machine builders who demand repeatable torque transfer need a drive pulley that holds its groove geometry under load — and that is exactly what these V-groove aluminum pulleys are designed to deliver.
Each pulley is machined from aluminum alloy and features a classic A-section V-groove profile. Available in four outer diameters — 40 mm (≈1.57 in), 60 mm (≈2.36 in), 80 mm (≈3.15 in), and 100 mm (≈3.94 in) — with bore diameters ranging from 8 mm to 32 mm to suit a wide range of shaft sizes. The lightweight aluminum construction keeps rotating mass low while maintaining the structural rigidity needed for continuous-duty applications.
Typical use cases include CNC router spindle drives requiring consistent belt tension, robotics joint actuators where compact pulley diameter matters, and conveyor or automation systems where A-section V-belts are the industry standard. Long-tail search terms like "aluminum A-belt pulley 80mm bore 20mm" and "V-groove drive pulley CNC" reflect exactly the precision-fit scenarios these pulleys address.
Machined to match standard A-type V-belt geometry for secure, slip-resistant belt seating under load.
Low rotating mass reduces motor load and inertia, making these pulleys well-suited for servo and stepper-driven systems.
Wide diameter range lets you dial in the exact speed ratio your drive system requires without custom machining.
Covers the most common shaft diameters used in CNC spindles, conveyor rollers, and robotics actuators.
Machined concentricity keeps vibration low at operating speeds, protecting bearings and extending belt life.
Standard A-section dimensions mean these pulleys interchange directly with existing A-belt drive setups — no belt swap required.
| Belt Section | A-Section (A-type V-belt) |
|---|---|
| Material | Aluminum alloy |
| Outer Diameter (OD) | 40 mm / 60 mm / 80 mm / 100 mm |
| Bore Diameter | 8 / 10 / 11 / 12 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 22 / 24 / 25 / 28 / 30 / 32 mm |
| Groove Profile | Single A-section V-groove |
| Hub / Keyway | See variant options |
| Surface Finish | See variant options |
| Weight (per piece) | See variant options |
| Quantity per Order | 1 piece |
The outer diameter determines your speed ratio. Divide the motor pulley OD by the driven pulley OD to get the ratio. For example, a 40 mm drive pulley paired with an 80 mm driven pulley gives a 2:1 reduction. Choose the OD that achieves your target RPM at the driven shaft.
Select the bore diameter that matches your shaft exactly. A bore that is too large will cause runout and vibration; too small will not fit. Available bores range from 8 mm to 32 mm. If your shaft uses a keyway, confirm the hub keyway spec in the variant details or contact us before ordering.
Yes — the groove is machined to the standard A-section profile (top width ≈ 13 mm, angle 40°), so they accept any A-type V-belt from major belt manufacturers. They are not compatible with B, C, or other section belts without modification.
Aluminum alloy pulleys offer an excellent strength-to-weight ratio for light-to-medium duty applications such as CNC routers, 3D printer drives, and small conveyor systems. For heavy industrial loads exceeding the rated belt tension, cast iron or steel pulleys are typically recommended. Contact us to confirm suitability for your specific load requirements.
Aluminum naturally forms a protective oxide layer that resists moisture and mild chemical exposure, making these pulleys suitable for indoor and semi-outdoor environments. For harsh outdoor or salt-spray conditions, consider an anodized finish or additional protective coating.
Absolutely. These are a popular choice for CNC router axis drives and laser cutter gantry systems where A-section V-belts are used. Select the OD that matches your desired axis speed ratio and the bore that fits your stepper or servo motor shaft.
A smaller OD (40 mm) produces higher belt speed at the driven shaft for a given motor RPM, while a larger OD (100 mm) produces more torque multiplication when used as the driven pulley. Choose based on your speed-torque requirements and available center distance between shafts.
