ASTM A490 bolts are high-strength structural heavy hex bolts used for critical steel-to-steel connections. They are manufactured to ASTM requirements and are commonly supplied as ASTM F3125 Grade A490 bolts. Type 1 uses alloy steel, while Type 3 uses weathering steel for applications requiring enhanced atmospheric corrosion resistance.
ASTM A490 Structural Bolts are high-strength structural fasteners manufactured for heavy-duty bolted connections in structural steelwork. These bolts are designed to provide high tensile strength, reliable clamping force, and secure connections in demanding construction and engineering applications. ASTM A490 Heavy Hex Bolts are commonly used where high-strength structural bolting is required for bridges, buildings, towers, industrial structures, and heavy equipment.
We supply ASTM F3125 Grade A490 Bolts in different sizes, lengths, thread configurations, and finishes to meet project-specific requirements. These fasteners are available in Type 1 alloy steel and Type 3 weathering steel grades, subject to applicable ASTM requirements and product availability.
Table of Contents
- ➤ What Are ASTM A490 Structural Bolts?
- ➤ ASTM A490 Bolt Types
- ➤ ASTM A490 Heavy Hex Bolts Specifications
- ➤ ASTM A490 Chemical Composition
- ➤ ASTM A490 Mechanical Properties
- ➤ ASTM A490 Structural Bolt Sizes and Weight
- ➤ ASTM A490 vs ASTM A325 Structural Bolts
- ➤ Applications of ASTM A490 Structural Bolts
- ➤ Why Buy ASTM F3125 Grade A490 Bolts From Us?
- ➤ ASTM A490 Heavy Hex Bolts Supplier in India
- ➤ Quality Testing and Inspection
- ➤ Frequently Asked Questions About ASTM A490 Bolts
- ➤ Request a Quote for ASTM A490 Structural Bolts
What Are ASTM A490 Structural Bolts?
ASTM A490 is a specification for high-strength steel bolts used in structural connections. A490 bolts are generally manufactured with a heavy hexagonal head and are intended for applications where greater strength is required than conventional structural bolts.
A490 High Strength Structural Bolts are particularly suitable for connections subjected to high tensile loads, vibration, and significant structural stresses. Their heavy hex head provides a larger bearing surface and allows the use of appropriate structural bolting tools during installation.
The ASTM A490 specification has been incorporated into ASTM F3125, with Grade A490 identifying the corresponding high-strength structural bolt requirements.
ASTM A490 Bolt Types
ASTM A490 structural bolts are available in different material types depending on the intended service environment.
| Type | Material | Typical Application |
|---|---|---|
| ASTM A490 Type 1 | Alloy steel | General high-strength structural connections |
| ASTM A490 Type 3 | Weathering steel | Structural connections requiring improved atmospheric corrosion resistance |
ASTM A490 Type 1 Alloy Steel Bolts
ASTM A490 Type 1 Alloy Steel Bolts are manufactured from alloy steel and provide high tensile strength for heavily loaded structural joints. They are widely considered for bridges, steel buildings, industrial structures, transmission towers, and other load-bearing applications.
ASTM A490 Type 3 Weathering Steel Bolts
ASTM A490 Type 3 Weathering Steel Bolts are designed for applications where atmospheric corrosion resistance is an important consideration. They can be used with compatible weathering steel structures and are selected to complement the corrosion-resistant characteristics of the structural system.
ASTM A490 Heavy Hex Bolts Specifications
ASTM A490 Heavy Hex Bolts are manufactured with a heavy hex head and coarse or fine threads depending on the required size and application. Dimensional requirements are generally selected according to applicable ASME/ANSI structural fastener standards.
| Property | ASTM A490 Structural Bolts |
|---|---|
| Standard | ASTM A490 / ASTM F3125 Grade A490 |
| Bolt Type | Heavy Hex Structural Bolt |
| Material | Alloy Steel / Weathering Steel |
| Material Type | Type 1 / Type 3 |
| Nominal Diameter | Commonly 1/2 to 1-1/2 in. |
| Thread | UNC / UNF as specified |
| Head Style | Heavy Hex |
| Strength Level | High Strength Structural |
| Application | Structural Steel Connections |
| Installation | Turn-of-nut / calibrated wrench / direct-tension methods as applicable |
| Surface Finish | Plain or approved coating where permitted |
| Testing | Mechanical and dimensional testing as required |
Exact dimensions, coatings, testing and permissible sizes should be confirmed against the applicable current ASTM/ASME requirements and project specification.
ASTM A490 Chemical Composition
The chemistry of ASTM A490 alloy steel is controlled to achieve the required strength and hardenability. The actual limits depend on the applicable grade and manufacturing requirements.
| Element | Typical Controlled Alloying Element |
|---|---|
| Carbon (C) | Controlled |
| Manganese (Mn) | Controlled |
| Phosphorus (P) | Limited |
| Sulfur (S) | Limited |
| Silicon (Si) | Controlled |
| Chromium (Cr) | Alloying element |
| Molybdenum (Mo) | Alloying element |
| Nickel (Ni) | May be present depending on steel chemistry |
| Iron (Fe) | Balance |
Important: For procurement, the exact chemical composition should always be checked against the current ASTM F3125 Grade A490 requirements and the manufacturer's material test certificate.
ASTM A490 Mechanical Properties
The major advantage of A490 High Strength Structural Bolts is their high tensile and yield strength, making them suitable for highly loaded structural connections.
| Mechanical Property | ASTM F3125 Grade A490 |
|---|---|
| Tensile Strength | Approx. 150 ksi minimum |
| Yield Strength | Approx. 130 ksi minimum |
| Hardness | Controlled within applicable specification limits |
| Proof Load | As specified by applicable standard |
| Elongation | As specified by applicable specification |
| Reduction of Area | As specified by applicable specification |
Mechanical requirements can vary according to diameter and the applicable edition of the standard. Test certificates should be reviewed for project-specific compliance.
ASTM A490 Structural Bolt Sizes and Weight
We can supply A490 structural bolts in various diameters and lengths according to project requirements.
| Nominal Diameter | Approx. Weight per 100 Pieces* |
|---|---|
| 1/2 inch | 10–18 kg |
| 5/8 inch | 18–30 kg |
| 3/4 inch | 30–48 kg |
| 7/8 inch | 45–68 kg |
| 1 inch | 65–95 kg |
| 1-1/8 inch | 85–125 kg |
| 1-1/4 inch | 110–160 kg |
| 1-1/2 inch | 150–220 kg |
*Approximate weights vary according to bolt length, head dimensions, thread configuration and manufacturing tolerances. Final shipping weight should be confirmed from the actual order.
ASTM A490 vs ASTM A325 Structural Bolts
ASTM A490 and ASTM A325 are both associated with high-strength structural bolting, but they are not interchangeable simply based on bolt size.
| Feature | ASTM A490 | ASTM A325 |
|---|---|---|
| Strength Level | Higher | Lower |
| Material | Alloy steel / specified Type 3 material | Carbon/alloy steel depending on requirements |
| Bolt Style | Heavy Hex Structural | Heavy Hex Structural |
| Typical Use | Heavily loaded connections | General structural connections |
| Current F3125 Designation | Grade A490 | Grade A325 |
| Corrosion-Resistant Type | Type 3 | Corresponding requirements differ |
The correct grade should be selected by the structural engineer or project specification rather than substituted solely on dimensional compatibility.
Applications of ASTM A490 Structural Bolts
Why Buy ASTM F3125 Grade A490 Bolts From Us?
As an experienced ASTM A490 Structural Bolts Manufacturer, we focus on supplying structural fasteners according to applicable dimensional, material, testing, and documentation requirements.
We can provide ASTM A490 Heavy Hex Bolts in project-specific sizes and configurations, with supporting documentation such as material test certificates and inspection reports where required.
Key Supply Advantages
- ASTM F3125 Grade A490 compliance
- Type 1 and Type 3 options
- Heavy hex structural bolt configuration
- Multiple diameters and lengths
- Bulk and project-order supply
- Material test documentation
- Inspection and testing options
- Export-oriented packaging
- Customized supply according to drawings and specifications
ASTM A490 Heavy Hex Bolts Supplier in India
Looking for an ASTM A490 Heavy Hex Bolts Supplier in India for a structural construction or engineering project? We supply high-strength A490 structural fasteners for domestic and international requirements.
Share your required diameter, length, quantity, Type 1 or Type 3 requirement, thread specification, coating requirement, applicable standard, and delivery destination with us. Our team can review the requirements and provide a suitable quotation.
Request a Quote for ASTM A490 Structural Bolts today.
Quality Testing and Inspection
For structural fasteners, traceability and verification are important. Depending on project requirements, supplied A490 bolts can be supported by relevant inspection and testing documentation.
Possible checks include:
- Chemical composition analysis
- Tensile testing
- Yield strength testing
- Hardness testing
- Dimensional inspection
- Thread inspection
- Lot identification and traceability
- Material Test Certificate (MTC)
- Third-party inspection where specified
Testing and certification requirements should be agreed before order placement.
Frequently Asked Questions About ASTM A490 Bolts
Request a Quote for ASTM A490 Structural Bolts
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Send us your technical requirements, quantity and delivery location. We will help you select and source the appropriate structural fasteners according to the applicable specification.
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