Historical
ASTM A229/A229M-99
Standard Specification for Steel Wire, Oil-Tempered for Mechanical Springs
This specification covers two classes of oil-tempered steel spring wire intended especially for the manufacture of mechanical springs and wire forms. 1.2 The values stated in either SI (metric) units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
ASTM International [astm]