GB lifting chains in the lifting chain specification process, the country is related specifications. A, size 1, the diameter of the finished material of any material diameter of a section of the link should be equal to the nominal dimensions, tolerances should meet the relevant standards. When measured, the results of two measurements should be taken in the same cross-section perpendicular to each other in average. Measuring weld should be avoided, and the straight edge of the link, to avoid chain contact with the core die due to deformation of the cross section of the measurement results. 2, the length dimension of other chain link chain link, and the width of the chain pitch and high accuracy of several links shall comply with the relevant standards.