PPXNATR Or NATV Design Support Roller With A Polyamide 66 Axial Sliding And Sealing Ring On Both Sides. Improved Crowned Profile Of The Outer Ring Running Surface, KR Design Cam Follower Have The Same Features As NATR Or NATV, Sizes 16 And 19 Have One Slot In The Head Of The Stud As Standard. Sizes ≥ 22 Have A Recessed Hexagon On Both Ends, Features Except For The Outer Ring Running Surface, Which Has A Cylindrical Profile