... manufacture full range products of linear motion bearings,Linear shaft, linear guide, ballscrew, linear bushing,support rail ... unit and Linear Bearing Unit.And for Linear shaft has following features,Meteria:GCR15Hardness:HRC62+-2Accuracy:G6Roughness: ... , WCS40, WCS50, WCS60, WCS80. Chrome plated Linear Shaft Diameter 3mm ,linear round bar,linear motion bearing Shaft ,Bearing Steel linear ball shaft