2MM=15° Low Contact Angle HX=Angular Contact-Low Shoulder On Both Rings. VV=Non-Contact Seals On Both Sides. CR= Phenolic (Composition) QUL=(Segment Ax. Int. Cl/Pr, Code QL)=Set Of 4 Universal Bearings, Light Preload.FS637=An Example Of A Specification Number For Other Than Standard.