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 |
| 8199; |
|
| 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 F15548201;Gr.36 |
1.2 This specification does not cover requirements for machine screws, thread cutting/forming screws, mechanical expansion anchors or similar externally threaded fasteners.
1.3 Suitable nuts are covered in Specification A563. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows:
| Fastener Grade and Size | Nut Grade and StyleA |
| 8199;8199;8201;8199;8199;8199;A 1/4 to 11/2 in. | 8199;8199;8199;8199;A, hex |
| 8199;8199;8199;8201;8199;8199;A over 11/2 to 4 in. | 8199;8199;8199;8199;A, heavy hex |