The Timken B6251B Roller Bearing Assembly is a high-quality needle roller bearing made of durable steel material. With a bore diameter of 2-5/8 inches and a width of 7-1/4 inches (inner ring with 6.2 inches outer width), this bearing is designed for industrial automation and motion control applications. Manufactured in the United States by Timken, a trusted brand in bearings and bushings, this roller bearing assembly is a reliable and long-lasting component for mechanical power transmission systems.ID: 2-5/8″ ≈ 2.625″ ≈ 66.68 mm OD: 5.737″ ≈ 5-23/32″ ≈ 145.72 mm W: 7-1/4″ ≈ 7.250″ ≈ 184.15 mm