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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
A
Headed bolts, threaded rods and bent bolts intended for general applications.
B
Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
C*
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 *As of August 2007, grade C has been replaced by specification F1554 grade 36.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.
Mechanical Properties
Grade
Tensile, ksi
Yield, min, ksi
Elong %, min
A
60 min
--
18
B
60 - 100
--
18
C*
58 - 80
36
23
 
Recommended Nuts and Washers
Nuts
Washers
A307 Grades A & C*
A307 Grade B
1/4 - 1-1/2
1-5/8 - 4
1/4 - 4
A563A Hex
A563A Heavy Hex
A563A Heavy Hex
F844
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