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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 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.
                                  

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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