Iron Casting Double V-Groove Drive Pulley For B-Section V-Belt Pulleys Ø60-200mm

Match the OD to your required speed ratio: divide the motor pulley OD by the driven pulley OD to get the ratio. For the bore, measure your shaft diameter with a caliper and select the bore that matches exactly — the keyway locks the pulley axially so there should be no clearance fit. If your shaft is between listed bore sizes, select the next size up and have a machinist re-bore to your exact dimension.

Keyway size is matched to bore diameter per standard DIN 6885 proportions: 12–14 mm bore → 4×2 mm; 15–16 mm bore → 5×2.5 mm; 18–22 mm bore → 6×3 mm; 24–28 mm bore → 8×3.5 mm; 30–40 mm bore → 10×4 mm; 42 mm bore → 12×4 mm; 45–48 mm bore → 14×4.5 mm. The keyway is pre-cut — no additional machining required.

Yes. Running one belt in a double-groove pulley is common when you want the option to add a second belt later for increased torque capacity without replacing the pulley. The unused groove does not affect belt tracking or pulley balance at typical speeds.

Grey cast iron has moderate corrosion resistance. For indoor or sheltered workshop environments it performs well without additional treatment. For outdoor or high-humidity applications, apply a rust-inhibiting primer or paint after installation. The material is not suitable for continuous immersion in water or aggressive chemical environments.

Maximum safe RPM depends on OD and balance quality. As a conservative guideline for cast iron V-belt pulleys, peripheral belt speed should not exceed approximately 25–30 m/s. For a 60 mm OD pulley this corresponds to roughly 8,000–9,500 RPM; for a 200 mm OD pulley, approximately 2,400–2,900 RPM. Always verify against your drive design requirements and ensure the pulley is properly balanced for high-speed applications.

No. These pulleys are machined specifically for B-section V-belts (17 mm × 11 mm). Using an A-section belt (13 mm × 8 mm) or C-section belt (22 mm × 14 mm) will result in incorrect seating depth, reduced contact area, and accelerated belt wear. Always match the pulley groove profile to your belt section.

The keyway transmits torque; axial retention depends on your shaft configuration. If your shaft has a keyway groove and a set-screw tapped hole, use a set screw over the key for positive axial locking. If no set-screw hole is present, a shaft collar or retaining ring on the outboard side of the hub is recommended to prevent axial migration under load.