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ASTM A307-21

Current Revision

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

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1.1 This specification2 covers the chemical and mechanical requirements of two 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, studs, and threaded rod having a minimum tensile strength of 60 ksi and intended for general applications,

Grade B

Bolts, studs, and threaded rodA 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 F1554 Gr.36

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 A563. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows:

Fastener Grade and Size

Nut Grade and StyleA

      A 1/4 to 11/2 in.

    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 standard. No other units of measurement are included in this 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 F1789 unless otherwise defined herein.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


This specification covers the chemical and mechanical requirements for three grades (Grades A, B, and C) of carbon steel bolts and studs in specified sizes. This specification does not cover the requirements for machine screws, thread cutting/forming screws, mechanical expansion anchors, or other similar externally threaded fasteners. When tested, sampled specimens shall adhere to specified values for chemical composition, hardness, tensile strength, yield point, elongation, and dimensions.


SDO ASTM: ASTM International
Document Number A307
Publication Date Feb. 15, 2021
Language en - English
Page Count 6
Revision Level 21
Supercedes
Committee F16.02
Publish Date Document Id Type View
Feb. 15, 2021 A0307-21 Revision
Oct. 1, 2014 A0307-14E01 Revision
Oct. 1, 2014 A0307-14 Revision
Dec. 1, 2012 A0307-12 Revision
Oct. 1, 2010 A0307-10 Revision
Dec. 1, 2007 A0307-07B Revision
Aug. 1, 2007 A0307-07A Revision
June 15, 2007 A0307-07 Revision
Aug. 1, 2004 A0307-04E01 Revision
Aug. 1, 2004 A0307-04 Revision
Oct. 1, 2003 A0307-03 Revision
Oct. 10, 2002 A0307-02 Revision
May 10, 2000 A0307-00 Revision
Not Available A0307-97 Revision
Not Available A0307-78 Revision