KR40PPA SKF Cam Follower 40x20 M18x1.5 thread
KR design cam followers are fitted with a needle roller and cage assembly. They are also available with a full complement needle roller set, which is identified by the designation KRV. The outer ring is axially guided by the pressed-on flange ring and the head of the stud, which also serves as an integral flange.
KR design cam followers without a designation suffix or with the designation suffix B have a narrow gap between the outer ring and the two flanges that serves as a gap-type seal.
KR design cam followers are also available with an axial sliding ring made of polyamide 66 on both sides, identified by the designation suffix PPA or PPSKA. In the radial direction, the sliding ring forms a narrow labyrinth seal with the outer ring to protect against coarse contaminants. In the axial direction, the sliding ring serves as a contact seal to reliably retain grease in the bearing. This improves the lubrication conditions in the bearing, keeps friction and heat low, and extends grease service life.
All designs are available with a concentric seat or an eccentric collar on the stud. An eccentric collar, which has a shrink-fit onto the stud, enables less stringent manufacturing position tolerances to be specified for associated components. An eccentric collar is identified by the letter E at the end of the basic designation.