AASHTO M 204M/M 204-06 (2010)

AASHTO M 204M/M 204-06 is identical to ASTM A421/A421M-05 except provisions specified in this document.

This specification covers two types of uncoated stress-relieved, round, high-carbon steel wire commonly used in prestressed linear concrete construction, as follows:
Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and
Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire is involved (Wedge Anchorage).