... include three big categories: single row angular contact ball bearings, three-point-contact and four-point-contact ball bearings and double row angular ... of 70xx, 72xx, 73xx, 74xx, 79xx and inch series 5) Contact angle is classified as C(15°), AC(25°) and B(40 ... axial direction than double row designs 8) Double row angular contact ball bearings principally correspond to a matched pair of single ...