American Society for Testing and Materials (ASTM). Current edition approved March 1, 2006. Published March 2006. Originally approved in 1939. Last previous edition approved in 2005 as A 227/A 227M – 99 (2005). 4 p. This specification covers two classes of round colddrawn steel spring wire having properties and quality for the manufacture of mechanical springs that are not subject to high stress or requiring high fatigue properties and wire forms.