Series 7200C...7220C Have A Nylon Cage, Bigger Is Machined Phenol Resin Cage Except 7226C=Machined High Tensile Brass Cage. C=15° Contact Angle. DB=Duplex (Back To Back). GN=(Segment Ax. Int. Cl/Pr, Code CB)=Normal Preload. P5=Dimensional And Ru