Run-out and roundness are the key indexes that affect the performance of the roller, which will directly affect the stability and reliability of the transportation of goods. There are many factors that affect the run-out, mainly the roundness and straightness of the tube. Our company selects the straight seam high frequency precision roller special welded tube, meet the technical standards of GB/T13793, and customized production according to the higher dimensional tolerance, so that the roller can have better round run-out performance than JB/T 7012-2008.