Grade B7 Threaded Rod

Grade B7 Threaded Rod for Demanding Applications

Grade B7 threaded rod is a high-strength fastener made from heat-treated alloy steel, designed for critical structural and industrial applications where strength, durability, and temperature resistance are essential. Manufactured to ASTM A193 B7 standards, these rods are trusted in commercial construction, pressure vessel fabrication, mechanical assemblies, and environments exposed to heat or heavy loads.

If your project requires load-rated performance with elevated tensile strength, B7 threaded rod is the fastener you want holding it all together.

What Is Grade B7 Threaded Rod?

Grade B7 is a specification under ASTM A193 for alloy steel fasteners intended for high-pressure and high-temperature service. B7 threaded rod is made from quenched and tempered chromium-molybdenum steel, providing superior strength and performance compared to mild steel or A307 rod.

Key Features of B7 Threaded Rod

• High Tensile Strength: Minimum tensile strength of 125 ksi, far exceeding general-purpose rods
• Heat-Treated Alloy Steel: Made from chrome-moly steel, quenched and tempered for performance
• ASTM A193 Compliance: Meets industry specs for critical structural and mechanical use
• Available in Multiple Finishes: Choose from plain, zinc-plated, or hot-dip galvanized for corrosion resistance

When to Use Grade B7 Threaded Rod

• Structural steel connections in commercial or industrial buildings
• High-load anchor systems embedded in concrete or masonry
• Pressure vessel and flange assemblies
• Machinery and equipment mounting requiring elevated tensile ratings
• Steel fabrication for bridges, towers, or process piping

B7 rod is especially useful in environments with elevated temperatures (up to 800°F) or where long-term load bearing is required.

Finish Options

• Plain Steel: For indoor or controlled environments
• Zinc-Plated: Offers light corrosion resistance
• Hot-Dip Galvanized: Heavy-duty corrosion protection for outdoor or embedded use

Select the right finish based on exposure and performance requirements, especially when dealing with concrete embedment or outdoor applications.

Installation Notes

Always use matching Grade B7 nuts and hardened washers to maintain tensile integrity. When anchoring to concrete, ensure embedment length and epoxy or mechanical anchor systems are designed to match load ratings. Do not substitute mild steel hardware when using B7 rod, doing so can compromise performance and safety.

Frequently Asked Questions

• What is the tensile strength of B7 threaded rod? Minimum tensile strength is 125,000 psi (125 ksi), making it ideal for structural and high-load use.
• Is Grade B7 weldable? B7 is not typically welded. Welding can compromise the heat treatment and reduce strength. If welding is necessary, consult an engineer or use compatible alternatives.
• Is this rod magnetic? Yes, Grade B7 alloy steel is magnetic due to its ferrous content.
• Can I use B7 rod outdoors? Yes, with a hot-dip galvanized finish for maximum corrosion protection. Plain steel should not be used in exposed or humid environments.

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

If you're building for strength under stress, whether it's in steel fabrication, anchor design, or mechanical assembly, Grade B7 threaded rod gives you the tensile backbone to do it right.

Need Help Sizing or Specifying B7 Threaded Rod?

Our Fasteners Plus team can assist with diameter selection, grade-matched nuts and washers, and finish options for every application. From engineered anchor designs to jobsite framing, we’ll help you build it right fast.

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If you have any questions about fastener options, please do not hesitate to reach out to our Product Experts at (888) 794-1590 or by email at customerservice@fastenersplus.com.