... less coefficient of friction, high limiting speed, large size range and various structure.2.Features : Shield / closure: open ball bearing, ... , AISI316, ceramicRetainer: PTFE, nylon, PEEK or stainless steelHardness for rings and balls: 59 - 63HRCBall bearings bore size: 1 - 200mm3.Versions: ... ring N.With a snap ring groove in outer ring and external snap ring NR.In different radial clearances C5, C4, ...