This standard specifies the dimensions and parameters of cylindrical helical compression springs in which both ends of the coils are ground or flattened in the structure of ordinary cylindrical helical compression springs. This standard applies to ordinary cold-rolled or hot-rolled round-section cylindrical helical compression springs (hereinafter referred to as springs) subjected to static loads and dynamic loads with a cycle number N≤105, and the diameter of the spring material is 0.5mm~60mm.