Four-row cylindrical roller bearings are the one of the main bearings for rolling mills. They have compact structures and high stiffness, and can carry high radial loads but not axial loads. Because of inner rings with no ribs, inner and outer ring subassembly can be mounted respectively. Cleaning , inspecting and dismounting are very convenient. Four-row cylindrical roller bearings are especially applied to rolling mills required high speed and precision, for example: wire mills, bar and shape mills , cold or hot sheet mills and cogging mills . Brass solid cages or pin-type cages are mainly used in four-row cylindrical roller bearings . Our competitive products are following : 1: Thin-wall series deep groove ball bearings , four-point contact ball bearings and crossed cylindrical roller slewing bearings for robots; 2: Bearings for casting rolling mills , cold rolling mills , hot rolling mills and high precision foil rolling mills ; 3: Large- size and extra large-size slewing bearings ; 4: Large-size and extra large-size split bearings ; 5: Bearings for wind turbines .