1.1 ,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. The fasteners are designated by “,Grade”, denoting tensile strength and intended use, as follows:
| Grade | Description |
| , | , |
| Grade A | Bolts, studs, and threaded rod having a minimum tensile strength of 60 ksi and intended for general applications, |
| Grade B | Bolts, studs, and threaded rodA having a tensile strength of 60 to 100 ksi and intended for flanged joints in piping systems with cast iron flanges, and |
| Grade C | Replaced by Specification F1554 ,Gr.36 |
(A) ,Threaded rod is not usually produced to Grade B, but can be when specified by the purchaser.