Support rollers C&H support rollers have an internal design based on needle or cylindrical roller bearings. They have a thick-walled outer ring, which enables them to accommodate high radial loads, while reducing distortion and bending stresses. The outer ring running surface is crowned as standard. However, support rollers with a cylindrical (flat) running surface are also available. These pre-greased, ready-to-mount units are suitable for all types of cam drives, tracks and conveyor systems. C&H support rollers are available with or without flange rings. Metric Series - Features RSTO - separable,outer ring without rib,without inner ring STO - separable,outer ring without rib,with inner ring RNA22-2RS - separable, outer ring withour rib, without inner ring, double lip seals NA22 -2RS - separable, outer ring withour rib, with inner ring, double lip seals NAST-ZZR - separable,crowned outer ring, double shields NAST-ZZ - separable,cylindrical outer ring,double shields NAST-ZZUUR - separable,crowned outer ring,double shields and lip seals NAST-ZZUU - separable,cylindrical outer ring,double shields and lip seals NATR - with inner ring, axial plain washers on both sides NATR-PP - with inner ring, axial plain washers and lip seals on both sides NATV - full complement needle roller set, with inner ring, axial plain washers on both sides NATV-PP - full complement needle roller set,with inner ring, axial plain washers and lip seals on   both sides NUTR - full complement cylindrical roller set, with inner ring, labyrinth seals on both sides PWTR-2RS - full complement cylindrical roller set, with inner ring, lip seals on both sides NNTR..-2ZL - Full complement cylindrical roller set, with inner ring, central rib sealing shields  with lamellar ring on both sides Inch CYR - full complement needle roller set, with inner ring, axial plain washers on both sides YCRSR - full complement needle roller set,flanged outer ring,double seals