This needle roller bearing is designed as a yoke type track roller with a single row of needle rollers, featuring a particularly thick-walled outer ring, a needle roller and cage assembly, and a separate inner ring. Bore diameter is 10.0 mm, outside diameter 30.0 mm, and net mass is 50.58 g. The outer ring has no axial guidance, and the design is open, with the inner ring, outer ring, and needle roller and cage assembly all suited for separate mounting. The STO10 has no sealing, so protection from contamination and lubricant retention must be handled through the surrounding housing design and external sealing arrangements. The separate mounting capability of the inner ring, outer ring, and needle roller and cage assembly allows flexibility in installation sequence and fit selection. The thick-walled outer ring provides load-carrying capacity suited to direct rolling contact against a track or cam surface, consistent with the yoke type track roller construction.