SKF Four-Row Tapered Roller Bearings  BT4B 328817 E1/C475

Four-row tapered roller bearings
SKF Four-row tapered roller bearings can accommodate combined (radial and axial) loads at low to moderate speeds. They are used almost exclusively in work roll applications such as rolling mills.

SKF manufactures four-row tapered roller bearings in the TQO and TQI designs in the following variants:

TQO design bearings (face-to-face arrangement, fig. 1):
open or sealed
with cylindrical or tapered bore
with or without inner ring extension on both sides
with or without helical groove in the bore
basic design or SKF Explorer bearings

TQI design bearings (back-to-back arrangement, fig. 2):
with cylindrical or tapered bore
with or without inner ring extension on one side