Quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners.
Scope – This specification covers the chemical and mechanical requirements of quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners covering two strength levels, 4” diameter and smaller.
Grades |
A354 BC | Alloy Steel, quenched and tempered |
A354 BD | Alloy Steel, quenched and tempered |
Mechanical Properties |
Grade | Markings | Size | Tensile, ksi, min |
Yield, ksi, min | Elong %, min |
RA %,min |
Hardness |
BC | BC | 1/4 – 2-1/2 | 125 | 109 | 16 | 50 | C26-C36 | |
2-5/8 – 4 | 115 | 99 | 16 | 45 | C22-C33 | |||
BD | BD | 1/4 – 2-1/2 | 150 | 130 | 14 | 40 | C33-C39 | |
2-5/8 – 4 | 140 | 115 | 14 | 40 | C33-C39 |
Chemical
|
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 |
Recommended
|
Nuts | Washers | ||
Grade BC | Grade BD | |||
Plain | Galvanized | Plain | ||
A563C Heavy Hex | A563DH Heavy Hex | A563DH Heavy Hex | F436 |