1 Inch Bore Cast Iron Sheave Pulley for B Class and 5L V Belts Four And Quarter Inch Outer Diameter Solid Static Balanced Drive Pulley With 1 Inch Bore For Reliable Power Transmission In Machinery

Cast Iron Sheave for 4.25 in OD and 1 in Bore pulley
✔️ OD 4.25 in, bore 1 in, belt B/5L, 1 groove, key 3/16x3/32, single pulley

This sturdy cast iron pulley is designed for belt-driven machines using B-class or 5L V-belts. It is ideal for shop equipment, motors, compressors, and general drive setups where solid, reliable power transmission is needed.

✅ Outside diameter: 4.25 in
✅ Bore: 1 in
✅ Belt section: B class / 5L (also runs 4L and A belts)
✅ Keyway: 3/16 x 3/32
✅ Grooves: 1
✅ Material: cast iron
✅ Model: BK451
✅ Pack size: 1 pulley

Outside Diameter	Bore	Belt Section	Grooves	Keyway
4.25 in	1 in	B / 5L	1	3/16 x 3/32

💡 What is a cast iron V belt pulley used for in belt drive systems?

In basic terms, it serves to transfer torque from a drive motor to a driven component while keeping the belt aligned for smooth operation.

- Power transmission in belt driven motors
- Compatibility with B class and 5L belts
- Reduces belt slip and vibration during load changes
- Durable cast iron construction for longevity