ASTM-A307 › Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
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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.
1.1 This specification 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:
Bolts, studs, and threaded rod having a minimum tensile strength of 60 ksi and intended for general applications,
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
Replaced by SpecificationGr.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 . 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 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 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.
all thread rod; bolts; carbon steel; steel; studs; threaded rod;; ICS Number Code 21.060.10 (Bolts, screws, studs)
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May 1, 2017