Grade 55 Threaded Rod

Grade 55 Threaded Rod for Concrete Anchoring

Grade 55 threaded rod is a high-strength, weldable anchor rod designed specifically for structural concrete embedment, bridge construction, and DOT infrastructure projects. Manufactured to meet the ASTM F1554 Grade 55 specification, this threaded rod offers a combination of tensile performance, bendability, and field-weld compatibility that makes it ideal for demanding structural applications.

Whether you’re installing anchor bolts for highway sign supports, base plates, or steel columns, Grade 55 is engineered for strength and built to meet public and commercial project specs.

What Is F1554 Grade 55 Threaded Rod?

F1554 Grade 55 is a specification under ASTM for anchor bolts and rods used in concrete foundations. Grade 55 rods have a minimum yield strength of 55 ksi and a tensile strength of 75–95 ksi, making them stronger than mild steel but more flexible and weldable than higher-grade fasteners like Grade 105.

This makes them especially valuable for anchor assemblies requiring field welding or applications that must meet state DOT or bridge construction standards.

Key Features of Grade 55 Threaded Rod

• Weldable Composition: Manufactured with supplemental weldability requirements for safe field fabrication
• ASTM F1554 Compliance: Meets industry standards for structural anchoring into concrete
• High Yield & Tensile Strength: Designed for load-bearing applications in steel-to-concrete connections
• Multiple Finishes Available: Choose from plain, zinc-plated, or hot-dip galvanized depending on exposure

When to Use Grade 55 Threaded Rod

• Concrete-embedded anchor rod systems
• DOT and highway infrastructure projects
• Bridge supports, sign foundations, and pole bases
• Structural steel column anchoring
• Applications requiring field welding to anchor assemblies

Finish Options

• Plain Finish: Best for indoor or temporary installs
• Zinc-Plated: Moderate corrosion protection for indoor or low-moisture environments
• Hot-Dip Galvanized: Ideal for outdoor, embedded, or exposed concrete anchoring applications

When choosing a finish, consider corrosion exposure and compatibility with other embedded hardware to prevent galvanic reactions in the field.

Installation Considerations

F1554 Grade 55 threaded rod should be installed with matching nuts and washers that meet ASTM requirements. Always confirm embedment depths, edge spacing, and anchoring methods when working with structural concrete. If welding in the field, verify material certification for weldability and follow applicable procedures to maintain structural integrity.

Frequently Asked Questions

• Is Grade 55 threaded rod weldable? Yes. F1554 Grade 55 is available with supplemental weldable chemistry and is commonly used in field-welded anchor assemblies.
• What is the tensile strength of Grade 55 rod? The tensile range is 75,000 to 95,000 psi, with a minimum yield strength of 55,000 psi.
• Can I use it for DOT or bridge jobs? Yes. Grade 55 is widely accepted for Department of Transportation projects, especially where welding or high load performance is required.
• Does it come fully threaded? Yes. Unless otherwise noted, rods sold on this page are fully threaded end to end.

For more Frequently Asked Questions, check out our blog What is Threaded Rod?

When your anchor system needs the strength of steel, the weldability of mild rod, and the compliance of ASTM-grade material, Grade 55 threaded rod is the ideal choice for structural reliability and jobsite flexibility.

Need Help Specifying Grade 55 Threaded Rod?

Our experts can help you find the right finish, diameter, and certification for your project,whether it's commercial framing, DOT infrastructure, or custom anchor assemblies. Reach out for fast answers, technical specs, and fast shipping.

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