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When a slipping or misaligned belt derails your build mid-project, the culprit is often an undersized or poorly machined pulley. Makers, CNC builders, and automation engineers who need a reliable single-groove V-pulley that mates cleanly with standard B-type V-belts will find this aluminum pulley wheel a direct, no-compromise solution.
Each pulley is machined from aluminum alloy, delivering a lightweight yet rigid body with a natural resistance to corrosion. The outer diameter spans 50 mm to 100 mm (~1.97 in to 3.94 in), and bore sizes range from 8 mm to 42 mm (~0.31 in to 1.65 in) to accommodate a wide variety of shaft diameters. The single V-groove profile is precision-cut to match the B-type belt cross-section for consistent belt seating and minimal vibration.
Typical use cases include DIY CNC router spindle drives, conveyor belt tensioning systems, and light-duty industrial automation rigs where a compact aluminum V-groove pulley for B-type belt is needed without the lead time of custom machining.
| Material | Aluminum alloy |
|---|---|
| Groove Type | Single V-groove |
| Belt Compatibility | B-type V-belt (17 mm top width) |
| Outer Diameter (OD) | 50 mm / 60 mm / 80 mm / 100 mm (see variant options) |
| Bore Diameter | 8 mm – 42 mm (see variant options) |
| Finish | Natural aluminum (uncoated) |
| Weight | See variant options |
| Quantity per Order | 1 pcs (default); multi-pack options available |
The OD determines your drive ratio when paired with a motor pulley. A larger driven pulley (e.g., 100 mm) relative to a smaller drive pulley reduces output speed and increases torque. Calculate your target ratio by dividing the driven OD by the drive OD, then select the variant that matches. Common pairings for CNC routers use 50–80 mm driven pulleys with smaller motor pulleys.
Select a bore size that matches your shaft diameter exactly. For example, if your motor shaft is 14 mm, choose the "Bore 14 mm" variant. A bore that is too large will cause runout and vibration; a bore that is too small cannot be installed without machining. If your shaft uses a keyway, confirm the bore variant accommodates it or plan to have a keyway cut by a local machine shop.
No. This pulley is machined specifically for B-type V-belts, which have a 17 mm top width and a 40° groove angle. Using an A-type (13 mm) or C-type (22 mm) belt in a B-groove will result in improper seating, accelerated belt wear, and reduced power transmission efficiency. Always match the belt type to the groove profile.
Aluminum alloy naturally forms a thin oxide layer that resists surface corrosion in most indoor and light-outdoor environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, consider applying a clear anodize coating or a light film of corrosion-inhibiting lubricant on the bore and hub surfaces. The groove itself should remain clean and dry for optimal belt grip.
Yes. The aluminum V-groove pulley is well-suited for light-to-medium duty continuous-run applications such as conveyor tensioners, indexing drives, and automation actuators. Ensure the bore is properly secured with a set screw or keyway, and verify that belt tension is within the B-type belt manufacturer's recommended range to avoid premature bearing or belt wear.
Installation typically requires a shaft key (if a keyway is present), a set screw hex wrench (usually 3–5 mm Allen key), and a belt tension gauge or ruler for setting proper belt deflection. No press-fit tools are needed for standard bore-to-shaft fits. Ensure the shaft end is clean and free of burrs before sliding the pulley into position, then tighten the set screw to the torque specification for your shaft diameter.
Specific RPM and load ratings depend on the OD variant, bore size, and your belt tension setup. As a conservative guideline, aluminum V-groove pulleys of this size range are typically used in applications up to 1,500–3,000 RPM with light-to-medium belt loads. For high-speed or heavy-load applications, contact us to confirm suitability for your specific drive parameters.
