The TB Wood's BK3278 is a precision-engineered finished bore single groove sheave designed for B/5L/A/4L cross-section V-belts. With an outside diameter of 3.35 inches and a bore diameter of 7/8 inches, this sheave ensures optimal performance in light-duty fractional horsepower (FHP) applications. Constructed from high-quality cast iron, it offers durability and resistance to wear under operational stresses. The sheave features a single groove with a face width of 0.81 inches, accommodating various belt configurations to meet specific system requirements. Its finished bore design allows for easy mounting and alignment, reducing installation time and potential errors. The BK3278 sheave is compatible with TB Wood's Sure-Grip‚ QD-type bushings, providing a secure and reliable connection between the sheave and shaft. This compatibility enhances the sheave's performance and extends its service life. By integrating the BK3278 sheave into your drive system, you can achieve efficient power transmission, reduced maintenance costs, and improved overall system reliability. Its robust construction and precise design make it a valuable component for applications requiring consistent and dependable operation.