ASTM A490 Alloy Steel Structural Bolts: Properties, Advantages, and Applications
ASTM A490 Alloy Steel Structural Bolts are critical components in modern construction and engineering. They play a pivotal role in connecting steel structures, ensuring stability, and withstanding high-pressure environments. These bolts, manufactured from high-strength alloy steel, are widely used in construction, bridges, towers, and other heavy-duty structures where strength and durability are essential.
In this comprehensive guide, we will delve into what ASTM A490 Alloy Steel Structural Bolts are, their properties, and advantages, and why they are a preferred choice for structural connections. Additionally, we will explore the role of ASC LLP as one of the leading ASTM A490 Alloy Steel Structural Bolts exporters and suppliers.
What Are ASTM A490 Alloy Steel Structural Bolts?
ASTM A490 Alloy Steel Structural Bolts are high-strength, heavy hex bolts made from alloy steel. They are designed to be used in structural steel-to-steel connections, offering superior tensile and shear strength compared to standard steel bolts. These bolts meet the ASTM A490 specification, which outlines the mechanical and chemical requirements for high-strength bolts used in structural applications.
Properties of ASTM A490 Alloy Steel Structural Bolts
ASTM A490 Alloy Steel Structural Bolts are recognized for their high-performance characteristics, including:
- Strength: The main advantage of A490 bolts is their high tensile strength, rated at a minimum of 150 ksi (1034 MPa). This makes them suitable for demanding structural applications where a high level of force is exerted on connections. They can handle high loads without stretching, bending, or failing.
- Durability: The alloy steel used in A490 Alloy Steel Structural Bolts provides excellent durability, ensuring the longevity of the connections even under harsh conditions. Their resistance to wear and fatigue makes them ideal for structures that experience dynamic loads or vibrations.
- Corrosion Resistance: Although A490 Alloy Steel Structural Bolts are not inherently corrosion-resistant like stainless steel, they can be treated with protective coatings such as galvanization, which enhances their corrosion resistance. This makes them suitable for outdoor use, particularly in construction projects exposed to environmental elements.
- Temperature Resistance: These bolts perform well in both high-temperature and low-temperature environments, maintaining their strength and integrity under extreme conditions.
- Fatigue Resistance: ASTM A490 bolts have excellent fatigue resistance, meaning they can withstand repeated loading and unloading cycles, which is especially important in bridges, wind turbines, and other infrastructure subjected to fluctuating forces.
- Precision Manufacturing: These bolts are manufactured with tight tolerances to meet the ASTM A490 specification. This ensures uniformity in performance across different batches, a critical requirement for large-scale construction projects.
Advantages of ASTM A490 Alloy Steel Structural Bolts
ASTM A490 Alloy Steel Structural Bolts offer several advantages that make them the preferred choice for high-strength structural connections:
- Superior Load-Bearing Capacity: The primary advantage of ASTM A490 Alloy Steel Structural Bolts is their ability to bear heavy loads without failure. The high tensile strength of these bolts means they can be used in applications where safety and reliability are of the utmost importance, such as in bridges and skyscrapers.
- Cost-Effectiveness: Due to their strength, fewer A490 Alloy Steel Structural Bolts are required compared to standard bolts, which reduces the overall material and installation costs. Additionally, their durability minimizes the need for frequent replacements or maintenance, further lowering long-term expenses.
- Versatile Application: Alloy Steel ASTM A490 Structural Bolts are versatile and can be used in a wide variety of applications, from bridges and buildings to industrial equipment. Their ability to perform under different environmental conditions—whether high-stress loads, temperature fluctuations, or exposure to corrosive elements—makes them highly adaptable.
- Increased Safety: Safety is a critical factor in structural applications, and the high-strength properties of ASTM A490 Alloy Steel Structural Bolts ensure that structures remain secure under heavy loads and stress. Their use in seismic zones, wind-prone areas, and high-pressure environments enhances the overall stability of a structure.
- Ease of Installation: The heavy hex head of these bolts provides an improved grip for installation. This allows for greater torque application, making it easier for workers to tighten or loosen the bolts during construction and maintenance. Additionally, the heavy hex head design ensures even distribution of pressure across the bolt head, reducing the risk of deformation.
- Compliance with Industry Standards: ASTM A490 Alloy Steel Structural Bolts comply with the ASTM International standards, ensuring they meet stringent mechanical and performance criteria. This compliance guarantees that the bolts deliver consistent, high-quality results, regardless of the specific application.
Schedule and Size Chart
| Nominal Diameter (inches) | Thread Length (inches) | Minimum Bolt Length (inches) | Maximum Bolt Length (inches) |
| 1/2″ | 1-1/4″ | 2″ | 4″ |
| 5/8″ | 1-1/2″ | 2-1/4″ | 5-1/2″ |
| 3/4″ | 1-3/4″ | 2-1/2″ | 6″ |
| 7/8″ | 2″ | 3″ | 7″ |
| 1″ | 2-1/4″ | 3-1/2″ | 8″ |
| 1-1/8″ | 2-1/2″ | 3-3/4″ | 9″ |
| 1-1/4″ | 2-3/4″ | 4-1/4″ | 10″ |
Mechanical Properties Chart
| Property | Value |
| Tensile Strength | Minimum 150 ksi (1034 MPa) |
| Yield Strength | Minimum 130 ksi (895 MPa) |
| Elongation (in 4D) | Minimum 14% |
| Reduction of Area | Minimum 35% |
| Proof Load | 120 ksi to 144 ksi (827 MPa to 993 MPa) |
| Hardness | 33-39 HRC |
Specifications Chart
| Specification | Detail |
| ASTM Standard | ASTM A490 |
| Bolt Type | Heavy Hex Structural Bolt |
| Material | Alloy Steel |
| Coating Options | Hot-dip Galvanized, Zinc-plated, Plain Finish |
| Manufacturing Standard | ANSI B18.2.6 |
| Thread Type | Unified Coarse Thread (UNC) |
| Heat Treatment | Quenched and Tempered |
| Compliance | ASTM A490 covers both Type 1 (plain alloy steel) and Type 3 (weathering steel) |
| Applications | Steel-to-steel structural connections |
Chemical Composition Chart
| Element | Percentage (%) |
| Carbon (C) | 0.28 – 0.55 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.05 max |
| Silicon (Si) | 0.15 – 0.35 |
| Boron (B) | 0.0005 – 0.003 |
| Chromium (Cr) | 0.70 – 1.20 |
| Molybdenum (Mo) | 0.20 – 0.30 |
| Nickel (Ni) | 0.25 max |
Physical Properties Chart
| Physical Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1425°C – 1540°C (2597°F – 2800°F) |
| Thermal Conductivity | 45.0 W/m·K |
| Electrical Resistivity | 0.2 µΩ·m at 20°C |
| Specific Heat | 0.49 J/g°C |
| Elastic Modulus | 200 GPa (29,000 ksi) |
Application Chart
| Application | Description |
| Bridge Construction | Used in connecting beams and girders, providing high-strength structural support. |
| Skyscrapers | Essential in high-rise buildings to maintain the integrity of steel frameworks. |
| Transmission Towers | Utilized in power and telecommunication towers for securing the structural frames. |
| Wind Turbines | Ideal for securing the tall towers of wind turbines, ensuring stability in dynamic load conditions. |
| Heavy Machinery | Used to fasten heavy machinery components, especially in industries requiring strong and reliable connections. |
| Cranes and Heavy Equipment | Employed in large cranes and heavy-lift equipment where safety and structural integrity are critical. |
| Seismic Zones | Preferred for construction in earthquake-prone areas due to their ability to withstand extreme stress and dynamic loads. |
| Towers and Steel Structures | Commonly used in the construction of steel structures like telecom and power transmission towers. |
| Railway and Transportation Projects | ASTM A490 bolts are often used in railway and road infrastructure projects due to their high load-bearing capacities and durability. |
| Industrial Infrastructure | Widely used in the oil and gas industry, petrochemical plants, and power generation sectors for structural assembly of industrial equipment and buildings. |
Choosing the Right ASTM A490 Alloy Steel Structural Bolt Supplier
When selecting A490 Alloy Steel Structural Bolts, it’s essential to choose a supplier that can provide consistent, high-quality products. As one of the top ASTM A490 Alloy Steel Structural Bolts exporters and suppliers, ASC LLP has built a reputation for delivering reliable and durable fasteners that meet the highest industry standards.
- Quality Assurance: All of our bolts meet ASTM standards, ensuring top-notch performance in every application.
- Extensive Range: We offer a wide variety of bolt sizes and types to suit different structural needs.
- Global Reach: With a strong international presence, ASC LLP serves clients across the globe, providing timely and efficient delivery.
- Customization Options: We understand that each project is unique. We offer customization services to meet specific client requirements, from coatings to bolt dimensions.
- Expert Support: Our experienced team is available to provide technical guidance and support, helping you select the right fasteners for your project.
ASTM A490 Alloy Steel Structural Bolts are an indispensable component in the construction of large-scale structures. Their high strength, durability, and versatility make them the ideal choice for structural applications where safety and reliability are critical. With excellent load-bearing capacity and resistance to wear, fatigue, and environmental stress, these bolts ensure the longevity and stability of steel-to-steel connections.
Global Reach
Amardeep Steel Centre boasts a robust global presence and is committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality ASTM A490 Alloy Steel Structural Bolts. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
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