The Simpson 1/2 in. x 5 in. Hot-Dip Galvanized Retrofit Bolt is a precut threaded rod from Simpson, supplied with a nut and washer, designed for use with anchoring adhesives to anchor into existing concrete and masonry. When paired with a compatible Simpson anchoring adhesive, this retrofit bolt delivers a complete engineered anchoring system capable of handling both tension and shear loads in structural connections. 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, making post-installation identification quick and straightforward. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped onto the rod.

Key Features

• Handles both tension and shear loads - provides reliable structural performance in connections where forces act in multiple directions, reducing the need for supplemental hardware.
• Coarse thread type - promotes strong mechanical engagement with anchoring adhesive and surrounding substrate for a secure, lasting hold.
• End-stamped with rod length and color-coded by steel grade - allows for quick, accurate identification after installation without guesswork or additional documentation on site.
• No-Equal symbol stamped on 1/2 in. diameter and larger - adds a further layer of post-installation verification, supporting inspection and quality assurance processes.
• Hot-dip galvanized finish - delivers corrosion resistance suited to both interior and exterior environments, helping the fastener stand up to moisture and exposure over time.
• Supplied with nut and washer included - arrives ready to install with the essential hardware included, simplifying procurement and reducing the chance of missing components on the job.

Why This Product

• A complete engineered anchoring system in one package - when used with a Simpson anchoring adhesive, this retrofit bolt functions as a fully engineered solution for anchoring into concrete and masonry, giving contractors and engineers a coordinated, traceable system rather than a mix of unrelated components.
• Built for demanding structural applications - its ability to resist both tension and shear loads makes it well suited for connections that experience complex, multi-directional forces, expanding its usefulness across a wide range of structural retrofitting and anchoring projects.
• Designed for field efficiency - the stamped rod length, color-coded steel grade identification, and No-Equal symbol streamline post-installation verification, saving time during inspections and reducing potential errors on the job site.
• Corrosion-resistant finish for versatile deployment - the hot-dip galvanized coating makes this anchor bolt appropriate for both interior and exterior applications, eliminating the need to source separate fasteners for different exposure conditions on the same project.

Specifications

• MPN: RFB#4X5HDGP2
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Bolt Length: 5 in.
• Thread Type: Coarse
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Interior/Exterior: Interior/Exterior
• Country of Origin: United States

Approved Applications

• Anchoring into existing concrete using Simpson Strong-Tie anchoring adhesives
• Anchoring into existing masonry using Simpson Strong-Tie anchoring adhesives
• Structural connections requiring resistance to both tension and shear loads
• Interior and exterior installation environments

What's Included

Sold as packs of (2) Hot-Dip Galvanized Retrofit Bolts, Precut threaded rod (1/2 in. x 5 in.), Nut, Washer.

Frequently Asked Questions

What is a retrofit bolt used for?

The Simpson Strong-Tie RFB retrofit bolt is a precut threaded rod used with anchoring adhesives to anchor into existing concrete and masonry, providing both tension and shear load resistance in structural connections.

Does this bolt require a separate adhesive to install?

Yes. This retrofit bolt is designed to be used with Simpson Strong-Tie adhesives. When paired with a compatible Simpson Strong-Tie adhesive, the RFB offers a complete engineered anchoring system.

How can I identify the bolt after installation?

Each end of the threaded rod is stamped with the rod length in inches and is 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.

Is this bolt suitable for outdoor use?

Yes. The hot-dip galvanized finish provides corrosion resistance, making the RFB#4X5HDGP2 suitable for both interior and exterior applications.

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