ASTM A307-12 pdf free download.Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength. This specification2 covers the chemical and mechanical requirements of two grades of carbon steel bolts and studs in sizes 1/4 in. through 4 in. 3. Ordering Information 3.1 Orders for externally threaded fasteners (including nuts and accessories) under this specification shall include...