ASTM A307-21
(Specification)Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
ABSTRACT
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.
SCOPE
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.
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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.
Designation:A307 −21
Standard Specification for
Carbon Steel Bolts, Studs, and Threaded Rod 60000 PSI
1
Tensile Strength
This standard is issued under the fixed designation A307; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 1.4 The values stated in inch-pound units are to be regarded
2 as standard. No other units of measurement are included in this
1.1 This specification covers the chemical and mechanical
standard.
requirements of two grades of carbon steel bolts and studs in
1
sizes ⁄4 in. through 4 in. The fasteners are designated by 1.5 Supplementary Requirement S1 of an optional nature is
“Grade” denoting tensile strength and intended use, as follows: provided, which describes additional restrictions to be applied
when bolts are to be welded. It shall apply only when specified
Grade Description
in the inquiry, order, and contract.
Grade A Bolts, studs, and threaded
1.6 Terms used in this specification are defined in Termi-
rod having a minimum
tensile strength of 60 ksi
nology F1789 unless otherwise defined herein.
and intended for general
applications, 1.7 This international standard was developed in accor-
Grade B Bolts, studs, and threaded
dance with internationally recognized principles on standard-
A
rod having a tensile
ization established in the Decision on Principles for the
strength of 60 to 100 ksi and
intended for flanged joints in
Development of International Standards, Guides and Recom-
piping systems with cast iron
flanges, and
mendations issued by the World Trade Organization Technical
Grade C Replaced by Specification
Barriers to Trade (TBT) Committee.
F1554 Gr.36
A 2. Referenced Documents
Threaded rod is not usually produced to Grade B, but can be when specified by
the purchaser. 3
2.1 ASTM Standards:
1.2 This specification does not cover requirements for
A563 Specification for Carbon and Alloy Steel Nuts
machine screws, thread cutting/forming screws, mechanical
A706/A706M Specification for Deformed and Plain Low-
expansion anchors or similar externally threaded fasteners.
Alloy Steel Bars for Concrete Reinforcement
A751 Test Methods and Practices for Chemical Analysis of
1.3 Suitable nuts are covered in Specification A563. Unless
Steel Products
otherwisespecified,thegradeandstyleofnutforeachgradeof
B695 Specification for Coatings of Zinc Mechanically De-
fastener, of all surface finishes, shall be as follows:
posited on Iron and Steel
A
Fastener Grade and Size Nut Grade and Style
1 1 F606/F606M Test Methods for Determining the Mechanical
A ⁄4 to 1 ⁄2 in. A, hex
1
A over 1 ⁄2 to 4 in. A, heavy hex Properties of Externally and Internally Threaded
1
B, ⁄4 to 4 in. A, heavy hex
Fasteners, Washers, Direct Tension Indicators, and Rivets
F788 Specification for Surface Discontinuities of Bolts,
A
Nuts of other grades and styles having specified proof load stresses (Specifica-
Screws, Studs, and Rivets, Inch and Metric Series
tion A563, Table 3) greater than the specified grade and style of nut are also
suitable.
F1470 Practice for Fastener Sampling for Specified Me-
chanical Properties and Performance Inspection
F1554 Specification for Anchor Bolts, Steel, 36, 55, and
105-ksi Yield Strength
1
This specification is under the jurisdiction of ASTM Committee F16 on
F1789 Terminology for F16 Mechanical Fasteners
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
Nuts, Rivets and Washers.
Current edition approved Feb. 15, 2021. Published April 2021. Originally
ɛ1
3
approved in 1947. Last previous edition approved in 2014 as A307 –14 . DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/A0307-21. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SA-307 in Section II of that Code. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A307−21
F2329/F2329M Specification for Zinc Coating, Hot-Dip, 4.4 Bolt and stud threads shall be rolled or cut.
Requirements for Application to Carbon and Alloy Steel
4.5 Zinc Coatings,
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: A307 − 14 A307 − 21
Standard Specification for
Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI
1
Tensile Strength
This standard is issued under the fixed designation A307; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1
ε NOTE—Section 7.3 was editorially corrected in May 2017.
1. Scope*
2
1
1.1 This specification covers the chemical and mechanical requirements of two grades of carbon steel bolts and studs in sizes ⁄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
A
rod 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
A
Threaded rod is not usually produced to Grade B, but can be when specified by the purchaser.
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:
A
Fastener Grade and Size Nut Grade and Style
1 1
A ⁄4 to 1 ⁄2 in. A, hex
1
A over 1 ⁄2 to 4 in. A, heavy hex
1
B, ⁄4 to 4 in. A, heavy hex
1
This specification is under the jurisdiction of ASTM Committee F16 on Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts, Nuts, Rivets
and Washers.
Current edition approved Oct. 1, 2014Feb. 15, 2021. Published October 2014April 2021. Originally approved in 1947. Last previous edition approved in 20122014 as
ɛ1
A307 –12. –14 . DOI: 10.1520/A0307-14E01.10.1520/A0307-21.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-307 in Section II of that Code.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A307 − 21
A
Nuts of other grades and styles having specified proof load stresses (Specification A563, Table 3) greater than the specified grade and style of nut are also suitable.
2
---------------------- Page: 2 ----------------------
A307 − 21
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.
2. Referenced Documents
3
2.1 ASTM Standards:
A563 Specification for Carbon and Alloy Steel Nuts
A706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement
A751 Test Methods and Practices for Chemical Analysis of Steel Products
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
F606F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners,
Washers, and Rivets (Metric) F0606_F0606M Direct Tension Indicators, and Rivets
F788/F788MF788 Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F1554 Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength
F1789 Terminology for F16 Mechanical Fasteners
F2329F2329/F2329M Specification for Zinc Coating, Hot-Dip, R
...
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