Technical Overview of the ASTM A354 Standard
The ASTM A354 specification establishes strict chemical and mechanical standards for fasteners made from quenched and tempered alloy steels. This standard covers bolts, studs, and other externally threaded fasteners up to 4 inches in diameter. Products supplied by EV Group China are designed for operation under normal atmospheric temperatures where high strength is critical, as well as for limited use in temperature regimes requiring specific material characteristics.
Note: For fasteners intended for use under prolonged exposure to high temperatures, it is recommended to refer to the ASTM A193 / A193M specification.
The standard classifies fasteners into two strength levels: BC and BD. The selection of a specific grade is determined by design loads, specific operating conditions, and connection assembly requirements.
Note: For structural connections of steel structures with diameters up to 1 1/2 inches, follow the ASTM F3125 / F3125M standard. Grades BC and BD may be used for fasteners with diameters over 1 1/2 inches if tensile strength requirements exceed 120 ksi (for BC) and 150 ksi (for BD), respectively.
When selecting nuts for ASTM A354 bolts and studs, the requirements of the ASTM A563 specification must be met. EV Group China recommends the following combinations:
| Fastener Grade and Surface Type | Recommended Nut (Type) |
|---|---|
| BC, plain or thin-film coated | C, heavy hex |
| BC, galvanized (requiring loose fit) | DH, heavy hex |
| BD, any finish | DH, heavy hex |
Note: The use of nuts of other grades and designs is permitted if their load-carrying capacity (according to A563) meets or exceeds the values established for the given fastener grade.
The terminology used in the specification complies with the F1789 standard. All linear dimensions and mechanical properties are provided in the inch-pound system, which is standardized for this specification.