American Society for Testing and Materials (ASTM). Current edition approved May 1, 2006. Published May 2006. Originally approved in 1973. Last previous edition approved in 2000 as A 679/A 679M – 00. 4 p. This specification covers round, uncoated, high tensile strength, cold-drawn steel spring wire, having properties and quality suitable for the manufacture of mechanical springs and wire forms subject to high static stresses or infrequent dynamic load, or both.