Cylindrical roller bearing NNU 49 series

double-rowsuper-precision

SKF super-precision double row cylindrical roller bearings are manufactured as standard in the NN 30 (fig. 1) and NNU 49 (fig. 2) series. Both series are available with either a cylindrical or a 1:12 tapered bore (designation suffix K). In machine tool applications, cylindrical roller bearings with a tapered bore are preferred over bearings with a cylindrical bore, because the taper enables more accurate adjustment of clearance or preload during mounting. NNU 49 series Bearings in the NNU 49 series, with a very low cross-sectional height, provide a higher degree of stiffness than bearings in the NN 30 series, but a somewhat lower load carrying capacity. NNU 49 series bearings have three integral flanges on the outer ring and no flanges on the inner ring.