This needle roller bearing carries radial loads in a compact single row design without an inner ring, with the outer ring featuring two ribs (bords) that axially locate the roller set. Outside diameter is 100.0 mm and the unit weighs 429.5 g net. The limiting speed reaches 5700 1/min, with a reference speed of 3700 1/min, and the bearing is fitted with a standard cage. The absence of an inner ring means the shaft seat itself must serve as the raceway, requiring a hardened and ground shaft surface with adequate surface finish to achieve the rated running accuracy. The two-rib outer ring design locates the needle roller and cage assembly axially within the housing bore, simplifying mounting while keeping the radial section low. With no seals fitted, lubrication and contamination protection must be provided externally, and the standard cage supports the full speed range up to the stated limiting speed under proper lubrication conditions.