ASTM A307 Specification
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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.

 

JF ENGG Manufactures,Stocks & Supplies Bolts,Studs,Threaded Bars/Rods as Specified under Specification ASTM A307 Grade A,Grade B & Grade C.

 

 A307 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 *As of August 2007, grade C has been replaced by specification F1554 grade 36.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.

 

 

Chemical Composition

Typical compositional ranges for grade ASTM A307

 

Element
Grade A
Grade 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%

 

 

 

Mechanical Properties

Typical mechanical properties for grade ASTM A307

 

Grade
Tensile, ksi
Yield, min, ksi
Elong %, min
A
60 min
--
18
B
60 - 100
--
18
C*
58 - 80
36
23

 

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For More Information About ASTM A307 Fasteners please call or send an email to  info@nmmehtaco.com