A490 Structural Bolts

A490 Structural Bolt Specifications and Information

In 2016, ASTM A490 was replaced by ASTM F3125 Grade A490. This consolidated multiple structural bolt standards into a single specification. Bolts with the A490 designation must meet F3125 Grade A490 requirements.

Key Features of A490 Bolts

• Alloy steel construction
• Higher tensile strength than A325 bolts
• Manufactured to meet the 33–39 HRC hardness range
• Compatible with ASTM A563 Grade DH nuts

Common Industrial Applications for ASTM A490 Bolts

A490 bolts are used in infrastructure that require extreme strength, including bridges and buildings with dynamic loads. Common applications include:

• Steel bridges
• Commercial buildings
• Industrial facilities
• Structural frames with high shear demand

A490 vs. A325 Structural Bolts

A490 bolts and A325 bolts are two grades of structural bolts that are often confused with each other. The differences matter at the specification stage. Understanding these differences helps reduce ordering errors and jobsite delays:

• Strength: A490 bolts offer higher tensile and shear strength than A325 bolts.
• Material: A490 bolts use alloy steel. A325 bolts may use carbon or alloy steel.
• Cost: A490 bolts typically cost more due to material and heat treatment.
• Coating Options: A325 bolts can be hot-dip galvanized. A490 bolts cannot.
• Typical Use: A325 suits standard structural connections. A490 fits higher load applications.

Coating Restrictions and Safety Considerations for ASTM A490 Bolts

A490 bolts cannot be hot-dip galvanized. The process increases the risk of hydrogen embrittlement, which can lead to sudden bolt failure. For this reason, A490 bolts are supplied in a plain finish or with approved alternatives specified by the project.
Proper installation is also essential for safety. A490 bolts require controlled tensioning methods and should be installed with compatible heavy hex nuts and hardened washers. Additionally, the use of lubrication can affect torque values and clamp force, so installation procedures should follow project specifications and applicable standards.

A490 Bolts from Fastco: Ordering Information and Custom Capabilities

We supply A490 bolts that meet ASTM F3125 Grade A490 requirements. Standard and custom options are also available. Our inventory includes:

• Diameters from 1/2 inch to 1-1/2 inch
• Standard and custom lengths
• Plain finish and approved alternative coatings
• Lock wire hole styles
• Domestic and imported options

Why Choose Fastco to Be Your A490 Bolt Supplier?

If you're looking for a supplier for A490 bolts, Fastco is your solution. We specialize in sourcing structural bolts for industrial and construction projects nationwide. All our A490 bolts are supplied with proper certifications and material traceability. Orders are verified for compliance with ASTM F3125 standards. With Fastco, you can count on:

• Ready-to-ship inventory of A490 bolts and other structural fasteners
• Bulk ordering options with volume discounts
• Fast order turnaround
• Documentation for inspection and project closeout requirements
• Custom services, including cutting, bending, and threading
• A helpful team ready to assist you in finding the best fasteners for your job

Contact Us to Learn How Fastco Can Be Your Supplier for A490 Bolts

Contact Fastco to discuss specifications, lead times, or custom requirements, or request a quote to get started on an order. Looking for other structural fasteners? Check out our selection of TC bolts, DH nuts, structural washers, and more.