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    ASTM A307-07

    Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength


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    1. Scope

    1.1 This specification covers the chemical and mechanical requirements of three grades of carbon steel bolts and studs in sizes 1/4 in. through 4 in. The fasteners are designated by "Grade" denoting tensile strength and intended use, as follows:

    Grade Description
    Grade A Bolts and studs having a minimum tensile strength of 60 ksi and intended for general applications,
    Grade B Bolts and studs having a tensile strength of 60 to 100 ksi and intended for flanged joints in piping systems with cast iron flanges, and
    Grade C Replaced by Specification F 1554 Gr.36

    1.1.1 The term studs includes stud stock, sometimes referred to as threaded rod.

    1.2 This specification does not cover requirements for machine screws, thread cutting/forming screws, mechanical expansion anchors or similar externally threaded fasteners.

    1.3 Suitable nuts are covered in Specification A 563. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows:

    Nuts of other grades and styles having specified proof load stresses (Specification A 563, Table 3) greater than the specified grade and style of nut are also suitable.

    Fastener Grade and Size Nut Grade and Style
    A 1/ 4 to 11/2in.A, hex
    A over 11/2 to 4 in.A, heavy hex
    B, 1/ 4 to 4 in.A, heavy hex

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

    1.5 Supplementary Requirement S1 of an optional nature is provided, which describes additional restrictions to be applied when bolts are to be welded. It shall apply only when specified in the inquiry, order, and contract.

    1.6 Terms used in this specification are defined in Terminology F 1789 unless otherwise defined herein.


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

    ASTM Standards

    F1554 Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength

    F1789 Terminology for F16 Mechanical Fasteners

    F2329 Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners

    ASME Standards

    B 1.1 Unified Screw Threads Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    B 18.2.1 Square and Hex Bolts and Screws

    B 18.24 Part Identifying Number (PIN) Code System Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://www.asme.org.

    B18.31.3 Threaded Rods (Inch Series)


    ICS Code

    ICS Number Code 21.060.10 (Bolts, screws, studs)

    UNSPSC Code

    UNSPSC Code 31161600(Bolts); 31163300(Studs)


    Referencing This Standard

    DOI: 10.1520/A0307-07

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A307-07, Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength, ASTM International, West Conshohocken, PA, 2007, www.astm.org

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