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| Specification | Value |
|---|---|
| ASTM Standard | ASTM A490 Type 1 |
| Tensile Strength | 1035–1205 MPa (150–170 ksi) |
| Yield Strength (min) | 940 MPa (0.2% offset) |
| Hardness | 33–38 HRC |
| Material Type | Alloy Steel, Quenched & Tempered |
| Max Service Temperature | 340°C (continuous) |
| Element | Composition (%) |
|---|---|
| C | 0.38–0.53 |
| Mn | 0.75–1.40 |
| Cr | 0.40–0.80 |
| Mo | 0.20–0.40 |
| P | ≤0.035 |
| S | ≤0.040 |
| Si | 0.15–0.40 |
ASTM A490 fasteners are manufactured from alloy steel incorporating carefully balanced additions of chromium, molybdenum, and nickel or manganese, depending on the specific chemistry selected by the producer. Chromium enhances hardenability and contributes to wear resistance, while molybdenum improves strength retention at elevated temperatures and reduces temper embrittlement. These alloying elements work together during the quenching and tempering process to develop a fine-grained martensitic microstructure, which is essential for achieving the high strength levels required by this specification.
The resulting mechanical performance makes A490 fasteners ideal for heavy structural steel connections, including bridges, high-rise buildings, and industrial framing where superior clamping force and fatigue resistance are critical. Their high tensile and yield strength allow for smaller fastener sizes without compromising joint integrity, reducing overall connection weight. Although not inherently corrosion resistant, these fasteners can be hot-dip galvanized or mechanically plated in accordance with specification allowances. Their elevated hardness and strength provide dependable long-term performance under high-load structural service conditions.
Specifications
ASTM A490 Fasteners specifications emphasize high-strength structural fastening components defined by precise mechanical properties, dimensional tolerances, and technical requirements under ASTM A490. They suit demanding load-bearing applications where strength, hardness, and fit are critical, with dimensions and performance aligned to applicable structural standards.
| Property | Value |
|---|---|
| Tensile Strength | 1035–1205 MPa |
| Yield Strength | 940 MPa min |
| Elongation | 14% min in 4D |
| Reduction of Area | 40% min |
| Hardness Range | 33–38 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion | 12.2 µm/m·°C |
| Density | 7.85 g/cm³ |
| Heat Treatment | Quenched & Tempered |
| Max Service Temperature | 340°C |
| Standard | Details |
|---|---|
| Bolt Standard | ASTM A490 Type 1/3, Heavy Hex Structural Bolts |
| Nut Standard | ASTM A563 DH/DH3 |
| Washer Standard | ASTM F436 |
| Thread Form | UNC per ASME B1.1 |
| Diameter Range | 1/2 in – 1-1/2 in |
| Length Range | 1-1/2 in – 8 in |
| Product Forms | Heavy Hex Bolts, Nuts, Washers, Assemblies |
| Custom Sizes | Available upon request |
| Manufacturing Standard | ASME B18.2.6 |
| Inspection Standard | ASTM F606 |
Applications
