Curve roller bearing:KR,KRV,KRE,STO,RSTO,NATR,NATV,NUTR CRY,RNA22..2RS,NA22..2RS Material:20GrMo ,GCr15 Metric and inch sizes Curve roller bearing/Cam follower:curve roller /cam follower is composed of a stud used as the tray of a group of rollers and a thick wall outer ring .The shoulder of the stud and the surface retaining ring on the stud form the guiding faces on the two sides of the outer ...