Linear Rail SystemLR Series linear rail system consists of a centerless ground and burnished stainless-steel shaft mated with a graphite- and PTFE-filled thermoplastic bushing. The series features a standard shaft straightness of .002(0.05mm) per foot. Typical radial clearance between shaft and bushing is .0005 (0.013mm) on non-coated assemblies and .001 (0.025mm) on TFE-coated assemblies. Bushings are manufactured with standard retaining ring grooves. Standard configurations include ¼, 3/8, ½ and ¾ nominal diameters.