V-Belt Pulley Motor Pulleys Hollow 6-8mm Discs Dia Ø120-250mm For 2A Type Belts

The speed ratio between your motor and driven shaft determines the pulley diameter ratio. Divide the motor pulley OD by the driven pulley OD to get the speed reduction (or multiply for speed increase). For example, a 120 mm drive pulley paired with a 240 mm driven pulley gives a 2:1 speed reduction. Select the OD that achieves your target RPM at the driven shaft.

Measure your motor shaft diameter with a caliper before ordering. The bore must match the shaft diameter exactly for a secure fit. A 6 mm bore suits smaller fractional-horsepower motors, while 8 mm is common on slightly larger motors. If your shaft is larger, contact us to confirm availability of other bore sizes.

Yes. The groove is machined to the 2A (A-section) V-belt profile, which is the most widely available V-belt standard. Standard A-section belts (e.g., A30, A40, A50, etc.) will seat correctly in the groove. Do not use B-section or other profile belts, as they will not seat properly and will wear prematurely.

Cast iron (HT200 or equivalent) has a tensile strength of approximately 200 MPa and excellent vibration-damping properties, making it well-suited for continuous-duty belt drive applications at moderate speeds. For high-speed or high-torque applications, verify that the pulley OD and bore are appropriately sized for your power requirements and consult a mechanical engineer if needed.

Cast iron has moderate corrosion resistance in dry indoor environments. For humid or outdoor environments, applying a light coat of machine oil or rust-inhibiting paint to non-groove surfaces is recommended. The V-belt groove itself should remain clean and dry for proper belt traction.

Yes — these are among the most common retrofit applications. They are suitable for bench-top lathes, drill presses, band saws, and light conveyor drives where A-section V-belts are already in use. Confirm that the bore matches your existing shaft and that the OD gives you the correct speed ratio before ordering.

Keyway availability depends on the specific variant. Please check the variant details or contact us to confirm. In the absence of a keyway, a set screw (grub screw) through the hub is the typical securing method for hollow-bore pulleys of this type. Ensure the set screw bears on a flat or dimple on the shaft for a secure connection.