Scope
The ASTM A354 specification covers the chemical and mechanical requirements of quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners 4″ and under in diameter.
Two strength levels, grade BC and grade BD, are summarized in the chart below. This specification is unrestricted in its configuration and can be a headed bolt, bent bolt, or threaded rod.
A354 Grades
A354 BD | A354 BC |
A354 grade BD bolts are higher in strength than A354 grade BC and equal in strength to ASTM A490 bolts. Unlike ASTM A490 however, the A354 BD specification is unrestricted in its configuration. Since A490 bolts are heavy hex structural bolts and do not exceed 1-1/2″ diameter, specification A354 BD should be considered for anchor bolts, threaded rods, other styles of headed bolts, and bolts larger than 1-1/2″ diameter where similar mechanical properties are desired. A354 grade BD does not require a magnetic particle test as is required by the A490 specification. | Lower in strength than grade BD. |
A354 Mechanical Properties
Grade | Size | Tensile, ksi, min | Yield, ksi, min | Elong %, min | RA %, min |
BC | 1/4 – 2-1/2 | 125 | 109 | 16 | 501 |
2-5/8 – 4 | 115 | 99 | 16 | 45 | |
BD | 1/4 – 2-1/2 | 150 | 130 | 14 | 40 |
2-5/8 – 4 | 140 | 115 | 14 | 40 |
A354 Chemical Properties
Element | Sizes 1/4 to 1-1/2 | Sizes above 1-1/2 |
Carbon | 0.30 – 0.53% | 0.35 – 0.53% |
Phosphorus, max | 0.035% | 0.035% |
Sulfur, max | 0.040% | 0.05% |
A354 Recommended Hardware
Nuts | Washers | ||
Grade BC | Grade BD | ||
Plain | Galvanized | Plain | |
A563C Heavy Hex | A563DH Heavy Hex | A563DH Heavy Hex | F436 |
* Nuts of other grades load stresses greater than the specified grade are suitable. Follow the link for an ASTM A563 Nut Compatibility Chart. | |||