... high precision rotating in the smooth movement.Linear shaft:Material: bearing steel, stainless steel, GCr15hardness:HRC60°±2°precision:g6surface roughness ... μm by 500mmHard Chorme Thickness: 3μm~5μmSeries:Linear bushing bearings: LM, LM..U, LM..L, LM..LUU, ... supports: SK, SHFSupport rail: SBR, SA, STBRApplications: Linear bearing widely used in electronic equipment, tension tester and digital 3d ...