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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 *As of August 2007, grade C has been replaced by specification F1554 grade 36.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

GradeTensile, ksiYield, min, ksiElong %, min
A 60 min -- 18
B 60 - 100 -- 18
C* 58 - 80 36 23

Chemical Properties

ElementGrade AGrade B
Carbon, max 0.29% 0.29%
Manganese, max 1.20% 1.20%
Phosphorus, max 0.04% 0.04%
Sulfur, max 0.15% 0.05%

Recommended Nuts and Washers

NutsWashers
A307 Grades A & C*A307 Grade B
1/4 - 1-1/21-5/8 - 41/4 - 4
A563A Hex A563A Heavy Hex A563A Heavy Hex F844