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When your CNC router, robotics platform, or DIY drive system demands reliable belt engagement without slippage or misalignment, the right pulley makes all the difference. These V-groove aluminum drive pulleys are engineered for builders, fabricators, and automation enthusiasts who need consistent torque transfer across a range of shaft sizes and center distances.
Each pulley is machined from aluminum alloy with a single V-groove profile sized for standard O-section (also known as Z-section) V-belts. Available in four outer diameters — 40mm (~1.57"), 50mm (~1.97"), 60mm (~2.36"), and 80mm (~3.15") — with bore diameters ranging from 7mm to 32mm to suit common motor and shaft standards. Hub depth is typically 20–35mm depending on OD size.
Typical applications include small CNC machine spindle drives, conveyor belt systems for maker projects, robotics joint actuators requiring V-belt reduction, and DIY lathe or drill press speed-change setups. The aluminum construction keeps rotating mass low while maintaining the dimensional accuracy needed for smooth, long-running belt drives.
| Belt Section | O-section / Z-section V-belt |
|---|---|
| Material | Aluminum alloy |
| Outer Diameter (OD) | 40mm / 50mm / 60mm / 80mm (see variant options) |
| Bore Diameter | 7mm – 32mm (see variant options) |
| Number of Grooves | 1 |
| Hub Depth | See variant options |
| Surface Finish | Natural aluminum (machined) |
| Quantity per Order | 1 piece |
The outer diameter determines your speed ratio when paired with a driven pulley. Divide the driver OD by the driven OD to get the approximate speed ratio. For example, a 40mm driver with an 80mm driven pulley gives a 2:1 reduction. Choose the OD combination that achieves your target RPM at the driven shaft.
Measure your motor or gearbox output shaft diameter with a caliper and select the matching bore. Common sizes include 8mm, 10mm, 12mm, and 14mm for small motors. If your shaft is between listed sizes, select the next larger bore and use a shaft collar or loctite-style retaining compound, or have the bore machined to an exact fit.
No. This pulley is specifically grooved for O-section (Z-section) V-belts, which have a narrower cross-section than A or B section belts. Using an A or B section belt in an O/Z groove will result in poor seating, accelerated belt wear, and reduced power transmission efficiency. Always match belt section to pulley groove profile.
The pulley bore is supplied as a plain bore. Set screw tapping or keyway cutting is not included as standard. For most DIY and light-duty applications, a set screw can be added with a tap and drill set. For higher-torque applications, we recommend having a keyway machined by a local machine shop to ensure secure shaft engagement.
Aluminum alloy offers good natural corrosion resistance in dry indoor environments typical of workshops, CNC enclosures, and robotics frames. For outdoor or high-humidity applications, applying a clear anodize coating or a light coat of corrosion-inhibiting spray will extend service life. Avoid prolonged contact with salt water or strong alkaline solutions.
Yes. These pulleys are well-suited for CNC router axis drives, laser cutter gantry systems, and similar light-CNC applications where O/Z-section V-belts are used for motion transmission. Select the OD and bore that match your motor shaft and desired mechanical advantage. Ensure belt tension is set correctly to avoid premature wear on both the belt and pulley groove.
Specific RPM and load ratings depend on the OD, bore, and application conditions. As a general guideline for aluminum V-belt pulleys of this size range, surface speeds up to approximately 10–20 m/s are typical for light-duty drives. For critical load-bearing applications, consult a mechanical engineer to verify suitability based on your specific torque, speed, and duty cycle requirements.
