Cast Iron Sheave AK25-5/8 In Single Groove Fixed Bore A Section Single Groove Cast Iron Pulley 2.5 Inch OD One is above the keyway, and the other is at a 90 position. This AK25 x 5/8 cast iron pulley is built to handle serious power transmission applications with durability and precision. The fixed bore design with 5/8-inch... Inside are two screws used to fix the shaft. Cast Iron 5/8 Bore A Section AK25 X 5/8 V-Belt Sheave Sheaves are accurately machined from fine grained cast lron Statically balanced, Surface anti rust spraying,Screws quantity:2 Standard V-Belt Sheave: For V-Belt Section A,AX,3L,4L CMFG AK56-5/8,AK56X5/8 V Belt Pulley,5.45 Inch OD, 5/8 Inch Bore,Cast Iron Material, AK Single Groove V Belt Pulleys For "4L" Or "A" Or "3L" Belts The pulley is formed through casting, using material that meets the American standard ASTM G3000, resulting in a product that is sturdy and durable. There is a hub, with two screw holes on it. Sheave is precision-processed through CNC to achieve high accuracy in all dimensions.