Astm 307a !link! -

ASTM A307 Grade A fasteners are made from carbon steel. The chemical composition is formulated to provide sufficient strength while maintaining good ductility and machinability. Maximum Manganese (Mn): Maximum Phosphorus (P): Maximum Sulfur (S): Maximum 3. Mechanical Properties of A307 Grade A

ASTM A307 bolts, studs, and stud bolts are categorized into two grades: astm 307a

The standard covers low-carbon steel fasteners, which are produced from steel made by any process and can be produced by any method of manufacturing, including rolling, forging, casting, etc. ASTM A307 Grade A fasteners are made from carbon steel