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ASTM A307
Scope
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4” through 4” diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar. There are three grades A, B, and C* which denote tensile strength, configuration, and application. Refer to the Mechanical Properties Chart for the subtle strength differences within each grade.
Grades
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A
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Headed bolts, threaded rods and bent bolts intended for general applications.
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B
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Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
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C*
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Nonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. *As of August 2007, grade C has been replaced by specification F1554 grade 36. We will continue to supply grade C, if required by the project.
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Mechanical Properties
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Grade
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Tensile, ksi
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Yield, min, ksi
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Elong %, min
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A
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60 min
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--
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18
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B
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60 - 100
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--
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18
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C*
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58 - 80
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36
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23
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Recommended Nuts and Washers
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Nuts
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Washers
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A307 Grades A & C*
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A307 Grade B
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1/4 - 1-1/2
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1-5/8 - 4
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1/4 - 4
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A563A Hex
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A563A Heavy Hex
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A563A Heavy Hex
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F844
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