SKF bearing mainly produce NNU design and NN design of double row cylindrical roller bearings. These bearings can be separated with integral flange bearing circle and roller and maintains module.They can be installed with other bearing circle respectively, or all bearing parts can be installed respectively. So the installation, check and maintain of these bearings are convenient.

Double row cylindrical roller bearing has cylindrical bore and tapered bore .The NN design bearing is generally supplied with tapered bore.As install the bearing with tapered bore may reach certain radial internal clearance or pre-load.

Within all these bearings,except for the NNUP design bearing, allowed axial displacement between the shaft and bearing block within certain limits.