The TB Wood's BK3478 is a single groove sheave designed for 4L or A section V-belts, offering a 3.55-inch outside diameter and a 7/8-inch finished bore. Manufactured from high-quality cast iron, this sheave ensures durability and reliable performance in light-duty applications. Its webbed pulley construction and precise dimensions make it suitable for various industrial settings, including material handling and conveyor systems. The sheave's compatibility with TB Wood's Sure-Grip QD-type bushings allows for easy mounting and maintenance, enhancing operational efficiency. By integrating the BK3478 sheave into your machinery, you can achieve optimal belt performance, reduce downtime, and extend equipment lifespan, thereby improving overall operational productivity.