Cylindrical roller bearing NN 30 series

double-rowsuper-precisionfor heavy loads

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. NN 30 series Bearings in the NN 30 series can provide a unique balance between load carrying capacity, rigidity and speed. They are therefore typically used as the non-tool end bearing in machine tool spindles. NN 30 series bearings have three integral flanges on the inner ring and no flanges on the outer ring.