ASTM A313/A313M-08

1.1 This specification covers austenitic and age-hardenable stainless steel round spring wire intended especially for the manufacture of springs.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 Unless the order specifies an “M“ designation, the material shall be furnished to inch-pound units.