Iron Casting Double V-Groove Drive Pulley For A-Section V-Belt Pulley Ø 60-100mm

The outer diameter (OD) determines your drive ratio when paired with a motor pulley. Divide the motor pulley OD by the driven pulley OD to get the approximate speed ratio. For example, a 60 mm motor pulley driving a 100 mm load pulley gives roughly a 0.6× speed reduction. Select the OD that achieves your target RPM at the driven shaft.

Measure your shaft diameter with a caliper. Choose the bore size that matches your shaft exactly — the keyway and set screw handle the torque, so the bore should be a close sliding fit (not loose). Available bores range from 12 mm to 45 mm across the OD variants.

Keyway dimensions follow standard metric key sizing and are matched to the bore: smaller bores (12–16 mm) use a 4×2 mm key, mid-range bores (15–22 mm) use 5×2.5 mm or 6×3 mm keys, larger bores (24–30 mm) use 8×3.5 mm, and the largest bores (32–45 mm) use 10×4 mm, 12×4 mm, or 14×4.5 mm keys. The exact keyway for each variant is shown in the "Keyway & Amount" option selector.

Grey cast iron has moderate corrosion resistance suitable for indoor workshop and light-industrial environments. For outdoor or high-humidity applications, apply a light coat of machine oil or rust-inhibiting spray to the exterior surfaces after installation. The machined bore and grooves should be kept lightly oiled when not in use.

Yes. A double-groove pulley can run with just one belt seated in either groove. Running a single belt in a double-groove pulley is common when you want the option to add a second belt later for increased power capacity without replacing the pulley.

These pulleys are machined for standard A-section V-belts with a top width of 13 mm (0.51") and a thickness of 8 mm (0.31"). This corresponds to the widely available "A" or "4L" belt designation. Do not use B-section or other profile belts, as the groove angle and depth will not match.

Check three dimensions: (1) your shaft diameter — match it to the bore option; (2) your existing or planned belt section — must be A-section; (3) your required drive ratio — use the OD options to calculate. If you are replacing an existing pulley, note its OD, bore, and keyway size and match them to the variant selector above.