SPECIFICATION LIBRARY

ASTM A307

ASTM A307 Specification Overview

ASTM A307 is a recognized standard for carbon steel bolts, studs, and threaded rods of tensile strengths suitable for their intended uses, particularly in general engineering applications. This specification covers two active grades: A and B.

Grade Classifications of ASTM A307

  1. Grade A

    1.   Designed for general applications, typically in low-pressure environments.

    2. Fabricated from carbon steel, it does not have specific alloying elements requirements.

  2. Grade B

    1. Contains a higher amount of manganese, providing slightly better mechanical properties than Grade A.

    2. Suitable for flanged joints and applications where higher mechanical stress is anticipated

  3. Grade C (Discontinued – Replaced with ASTM F1554 GR 36)

Chemical Composition

Grade

Carbon

Manganese

Phosphorus

Sulfur

A

.29%

<1.20%

≤ 0.04%

≤ 0.15%

B

.29%

<1.20%

≤ 0.04%

≤ 0.05%

Mechanical Properties

Grade

Tensile Strength

Yield Strength (min)

Elongation

Hardness

A

60 ksi min

60 ksi

18% min

121-241 BHN

B

60-100 ksi

60-100 ksi min

18% min

121-212 BHN

Applications and Usage

  • Grade A is often used for simple construction projects, like securing wooden structures or where strength is not the key factor.

  • Grade B is utilized in environments that require a higher level of mechanical strength, such as in flanged piping systems.

Manufacturing Process and Quality Assurance

ASTM A307 fasteners are manufactured through processes like hot-forging and cold-heading, followed by threading. These fasteners are available in coated or plain finishes based on application needs. Quality assurance tests, including tensile and proof load testing, are conducted to verify their compliance with the standard's requirements.

 

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