One Groove Solid Cast Iron Pulley With Seven Eighth Inch Bore And Four Point Two Five Inch Outer Diameter For V Belts Four L And Five L Finished Bore With Standard Keyseat And Static Balanced

Single 4578 Cast Iron Pulley, 4.25in OD, 7/8in Bore
✔️ 1-piece solid pulley for 4L/5L belts, 4.25in OD, 7/8in bore

The 4578 cast iron pulley is a solid V-belt pulley designed for small drive systems. It accepts 4L or 5L belts and features a precise 7/8 inch bore and a 4.25 inch outer diameter. This type of pulley is common in hobby machines, woodworking tools, and compact conveyors where reliable belt power transmission matters.

✅ Outside diameter: 4.25 in (108 mm)
✅ Bore: 7/8 in (22.23 mm)
✅ Material: cast iron, statically balanced
✅ Belt compatibility: 4L, A, 5L, B belts
✅ Keyway: 3/16 x 3/32 in (4.76 x 2.38 mm); hollow head setscrews

💡 What is a cast iron pulley with a 7/8 bore used for in belt drive systems?

Handy explanation and practical use:

- Ideal for small belt drives needing reliable power transmission
- Supports standard V-belt sizes 4L and 5L
- Cast iron rigidity reduces vibration and wear
- Uses a 7/8in bore with a 4.25in OD for easy shaft fit