ASTM A307 Grade B Specification
ASTM A307 Grade B Specification for medium strength carbon steel bolts, studs, threaded rods & similar externally fasteners with tensile strength between 60 to 100 ksi.
ASTM A307 Grade B is a standard material specification for medium strength carbon steel fasteners specially bolts, studs and threaded rods for general purpose applications. Grade B is a heat treated carbon steel bolting material with minimum tensile requirement between 60 to 100 ksi and hardness range from 121 to 212 BHN. ASTM A307 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B Bolts.
Chemical Composition
| Element |
Grade B |
| Carbon |
0.29 |
| Manganese, max |
1.20 |
| Phosphorus, max |
0.04 |
| Sulfur, max |
0.15 |
Mechanical Properties
| Bolt Grade |
Diameter, Inch |
Tensile Strength, ksi |
Yield Strength ksi |
Elongation, % |
Hardness, BHN |
| A |
1/4 to 4, inclusive |
60 |
... |
18 |
121 - 241 |
Recommended Nuts & Washers