ASTM A 307

[ AREAS-963 ]

The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. 

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.

ASTM A307 Chemical properties

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%

ASTM A307 Mechanical properties

Grade

Tensile, ksi

Yield, min, ksi

Elong %, min

A

60 min

--

18

B

60 - 100

--

18

C*

58 - 80

36

23

ASTM A307 Marking

Grade

Marking Details

A

Bolts are marked or stamped with “307A” along with RFL logo or as per customer need.

B

Bolts are marked or stamped with “307B” along with RFL logo or as per customer need.

C*

Bolts are marked or stamped with “307C” along with RFL logo or as per customer need.

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