Super precision high load capacity angular contact ball bearings are divided into two series, 719.D (SEB) and 70.D (EX), the bearings of these two series have two contact angles, two kinds of ball materials and two kinds of ring materials , and can be manufactured into two tolerance classes, most bearings come standard with phenolic resin cages, except for the three largest bearings, these bearings have machined brass cage versions, common sizes also have PEEK resin cages, to Adapt to higher bearing operating temperatures.