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ASTM A307 Grade A carbon steel bolts studs and threaded rod 60000PSI tensile strength

Nuts and bolts exhibit low strength. However, mild steel is highly flexible. High ductility is a property that makes the material ideal for machining and welding. No different elements – used as an alloying agent, not other types of steel, which makes nuts and bolts known as low-cost bolts.

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ASTM A307 is the standard specification for carbon steel bolts, studs, and threaded rods of 60000 PSI tensile strength in sizes from ¼ inch to 4 inches in diameter. A307 bolts are available in two grades, A and B, offering different mechanical and chemical properties for specific applications.

These bolts are designed, manufactured and tested to comply with the standards set by ASTM A307 for chemical composition, hardness, tensile strength, yield point, elongation, and dimensional accuracy.

Grade A is a heat treated carbon steel bolting material with minimum tensile requirement of 60 ksi and hardness range from 121 to 241 BHN. ASTM A307 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade A Bolts.

 

Chemical Composition

Element Grade A
Carbon 0.29
Manganese, max 1.20
Phosphorus, max 0.04
Sulfur, max 0.15

Mechanical Properties

Bolt Grade Diameter, Inch Tensile Strength, ksi Yield Strength ksi Elongation, % Hardness, BHN
A 1/4 to 4, inclusive 60 18 121 – 241

Recommended Nuts & Washers

Bolt Specification Bolting Diameter. Inch Nut Specification Washer Specification
A307 Grade A 1/4 to 4, inclusive ASTM A563 Grade A ASTM F844
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