Sealed paired single row tapered roller bearings 30302 For to match their many uses, SKF produced the tapered roller bearingsin many designs and sizes. For example: Single row tapered roller bearings, paired single row tapered roller bearings, double row tapered roller bearings and four-row tapered roller bearings. In addition to tapered roller bearings for general use, SKF also manufactures sealed, greased and pre-adjusted units based on tapered roller bearings.