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| Specification | Value |
|---|---|
| ASTM Standard | A307 Grade A |
| Material | Low Carbon Steel |
| Tensile Strength | 60,000 psi (min) |
| Yield Strength | Not specified (typically ~36,000 psi) |
| Hardness | Rockwell B69–100 |
| Max Service Temperature | 150°C (302°F) |
| Element | Composition (%) |
|---|---|
| C | 0.18–0.30 |
| Mn | 0.60–0.90 |
| P | ≤0.040 |
| S | ≤0.050 |
| Si | 0.10–0.30 |
ASTM A307 Grade A fasteners are manufactured from low carbon steel, typically containing carbon in the range of 0.15–0.30%, along with controlled amounts of manganese, phosphorus and sulfur. Carbon content provides moderate strength while maintaining good ductility and machinability. Manganese enhances hardenability and tensile strength without compromising weldability, while limited phosphorus and sulfur levels help ensure toughness and reduce brittleness during forming and threading operations.
These compositional characteristics make A307 Grade A fasteners well-suited for general-purpose structural and mechanical applications where moderate strength, cost-effectiveness and ease of fabrication are required. The material offers reasonable atmospheric corrosion resistance, particularly when galvanized, and performs reliably under moderate temperature conditions. Its balanced mechanical performance, combined with widespread availability and low cost, makes it a preferred choice for bolts, studs and general fastening applications in non-critical load environments.
Specifications
ASTM A307 Grade A Fasteners are general-purpose carbon steel fastening components specified under ASTM A307, combining reliable mechanical properties, controlled dimensional requirements, and practical technical data for structural and industrial assemblies. Their performance is defined by strength, size, and tolerance criteria suited to standard fastening applications.
| Property | Value |
|---|---|
| Tensile Strength | 60,000 psi (min) |
| Yield Strength | ~36,000 psi (typical) |
| Elongation | 18% min in 2 in. |
| Hardness | Rockwell B69–100 |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion | 11.7 x10⁻⁶ /°C |
| Density | 7.85 g/cm³ |
| Max Service Temperature | 150°C (302°F) |
| Standard | Details |
|---|---|
| Bolt Standard | ASTM A307 Grade A |
| Nut Standard | ASTM A563 Grade A |
| Washer Standard | ASTM F844 |
| Thread Form | UNC / UNF (ASME B1.1) |
| Diameter Range | 1/4 in. to 4 in. |
| Length Range | 1/2 in. to 20 in. |
| Product Forms | Hex Bolts, Studs, Carriage Bolts |
| Manufacturing Standard | ASME B18.2.1 |
Applications
