Two-row high-precision cylindrical roller bearings

Two-row cylindrical roller bearings are floating bearings. Mounting and dismounting is facilitated because they can be disassembled. Thus the rings can be fitted in firmly. Radial support of the main spindle of machine tools is the most important application for the bearing series NN30.. . NN means that the inner ring is provided with three guide flanges while the outer ring is without guide flanges. In addition, the standard design is provided with a conical bore (cone 1:12). Due to the conical bore it is possible to set the radial bearing clearance to optimum values. The outer ring is available with lubrication groove and lubrication bores on request. Lubrication is simplified in this way. The NNU49.. is also a two-row cylindrical roller bearing consisting of solid inner rings without guide flanges, solid outer rings with three guide flanges and can be dismantled.