4" Cast Iron Pulley with 5/8" Shaft Brand new single groove 4" pulley with a 5/8" bore for A section or 4L belts. This is a high quality cast iron pulley. This pulley is designed and bored to fit a 5/8" keyed shaft. This pulley is designed to be used with A Section Belts (also known as 4L Belts). Specifications: AK40 3.75" Diameter Fits 5/8" Shaft Solid Cast Iron Construction Secure Reliable Performance Single Groove E105990 Husky C602H 60 Gallon Stationary Electric Air Compressor Parts