The Simpson 1/2 in. x 8 in. Hot-Dip Galvanized Retrofit Bolt from Simpson Strong-Tie is a precut threaded rod supplied complete with a nut and washer, engineered for anchoring into existing concrete and masonry when paired with Simpson Strong-Tie adhesives. Capable of handling both tension and shear loads in structural connections, this bolt delivers a complete engineered anchoring system built for demanding retrofit and new-construction applications alike. Each end of the rod is stamped with the rod length in inches and color-coded to indicate the grade or type of steel, making post-installation identification fast and reliable. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod, further simplifying field verification.

Key Features

• Handles both tension and shear loads - supports demanding structural connections where multi-directional force resistance is required, reducing the need for additional hardware.
• Coarse thread type - promotes strong mechanical engagement with Simpson Strong-Tie adhesives, helping ensure a secure and reliable anchor in concrete and masonry.
• End-stamped rod length in inches - allows installers to confirm the correct bolt is in place even after installation, minimizing costly errors on the job site.
• Color-coded ends indicating steel grade or type - provides fast, at-a-glance field identification without the need for separate documentation or labeling.
• No-Equal symbol stamped on rod - a distinctive mark on 1/2 in. diameter and larger bolts that makes post-installation verification straightforward and audit-ready.
• Hot-dip galvanized finish - delivers a corrosion-resistant coating suited for applications where long-term performance and durability in exposed or demanding environments matter.
• Supplied with nut and washer included - arrives as a ready-to-install assembly, so installers have everything needed for a complete anchoring connection without sourcing separate hardware.

Why This Product

• A complete engineered anchoring system in one package - when used with Simpson Strong-Tie adhesives, the RFB retrofit bolt forms a fully engineered solution for anchoring into existing concrete and masonry, giving buyers confidence that all components are designed to work together.
• Built-in identification features save time and reduce errors - end-stamped rod lengths, color-coded steel grade indicators, and the No-Equal symbol mean crews can verify the correct bolt quickly post-installation, cutting inspection time and protecting structural integrity.
• Dual load capacity broadens application versatility - the ability to resist both tension and shear loads in a single fastener makes this retrofit bolt a practical choice for a wide range of structural anchoring situations, from seismic retrofits to general masonry connections.
• Hot-dip galvanized protection for lasting performance - the hot-dip galvanized finish provides durable corrosion resistance, making this bolt a dependable choice for projects where longevity and finish integrity are priorities.

Specifications

• MPN: RFB#4X8HDGP2
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Bolt Length: 8 in.
• Thread Type: Coarse
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Country of Origin: United States

Approved Applications

• Anchoring into existing concrete when used with Simpson Strong-Tie adhesives
• Anchoring into existing masonry when used with Simpson Strong-Tie adhesives
• Structural connections requiring both tension and shear load resistance

What's Included

Sold as packs of (2) Hot-Dip Galvanized Retrofit Bolts, Precut hot-dip galvanized threaded rod, Nut, Washer.

Frequently Asked Questions

What type of adhesive should be used with the Simpson Strong-Tie RFB retrofit bolt?

The RFB retrofit bolt is designed to be used with Simpson Strong-Tie adhesives to anchor into existing concrete and masonry, creating a complete engineered anchoring system.

How can I identify the rod length and steel grade after installation?

Each end of the threaded rod is stamped with the rod length in inches and color-coded to indicate the grade or type of steel, allowing for quick and easy identification post-installation. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod.

What types of loads does the RFB retrofit bolt support?

The RFB retrofit bolt provides both tension and shear load resistance in connections, making it suitable for demanding structural anchoring applications.

Why is a hot-dip galvanized finish used on this retrofit bolt?

The hot-dip galvanized finish provides enhanced corrosion resistance, making the RFB retrofit bolt well-suited for applications where exposure to moisture or corrosive environments is a concern.

Note: Product dimensions and/or length may differ from picture. Please see the item description above for specifications.