E=(AC-SKF)=25° Contact Angle. MPA=(MA-Cage Type Segment)=Window-Type Machined Brass Cage; Guidance By The Outer Ring (Housing). P4S=(4S-Precision Segment)/(P4A-SKF)=(MMV-FAF)=Boundary Dimensions ISO 4, Abec-7, Running Accuracy ISO 2, Abec-9. UM=