Angular contact ball bearings are non-separable type bearings and typically used for carrying combined (axial and radial) loads. They can carry pure axial load and operate in higher speed. That's why many people refer to them incorrectly as thrust bearings. There are three basic types of angular contact ball bearings: 

Single Row Bearings 
Double Row Bearing 
Four Point Contact Ball Bearings 
Single row angular contact ball bearings have raceways in the inner and outer rings that are displaced with respect to each other in the direction of the bearing axis. This means that they are designed to accommodate combined loads, 
i. e. Simultaneously acting radial and axial loads. The axial load carrying capacity of angular contact ball bearings increases with increasing contact angle. The contact angle a is defined as the angle between the line joining the 
Points of contact of the ball and the raceways in the radial plane, along which the load is transmitted from one raceway to another, and a line perpendicular to the bearing axis.

Main series is as below:
B70 series: B 7000C -B 7048C
70 Series: 7001C (AC) -7048C (AC)
72 Series: 7200C (AC) -7248C (AC)
73 Series: 7303BTN-7328BTN
718 Series: 71800C (AC) -71848C (AC)
719 Series: 71900C (AC) -71996C (AC)
H719 Series: H 71900C (AC)-H71992
7602 Series: 760201TN1-760226TN1
7603 Series: 760301TN1-760326TN1
BS Series: BS1547-BS100150
BSS Series: BSS2047
H70 Series: H 7000C -H 7034C
B-standard ball just spindle bearing;
7-type number, Angle contact ball bearing;
0-serial number;
19-95 mm diameter size;
15 ° C-contact Angle, Angle contact ball bearing;
T-machine cut fiber reinforced phenolic resin keep frame, guide roller;
P4S-size accuracy with ISO tolerance grade 4, operation precision quite and ISO standard P2 level;
UL-face to face in bearing or back-to-back installation midly over surplus
Angular groove and lubrication holes:
To facilitate efficient lubrication, all bearings have a groove and three lubrication holes in the housing washer.