ASTM A421/A421M-98a

    Standard Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete

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    1. Scope

    1.1 This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction, as follows:

    1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and

    1.1.2 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).

    1.2 Supplement I describes low relaxation wire and relaxation testing for that product.

    1.3 The values stated in inch-pound units are to be regarded as the standard.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    Military Standard

    MIL-STD-129 Marking for Shipment and Storage

    Federal Standard

    Fed.Std.No.123 Marking for Shipments (Civil Agencies)


    ICS Code

    ICS Number Code 77.140.15 (Steels for reinforcement of concrete); 77.140.65 (Steel wire, wir ropes and link chains)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/A0421_A0421M-98A

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