The Simpson 1/2 in. x 6 in. Hot-Dip Galvanized Retrofit Bolt from Simpson is a precut threaded rod supplied with a nut and washer, engineered for anchoring into existing concrete and masonry when used with anchoring adhesives. 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, enabling quick and easy post-installation identification. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on each end. When paired with a Simpson Strong-Tie adhesive, this retrofit bolt delivers a complete engineered anchoring system built for demanding structural connections.

Key Features

• Handles both tension and shear loads - supports a wide range of structural connection demands in a single fastener, reducing the need for multiple hardware types.
• Coarse thread type - provides strong mechanical engagement with adhesive anchoring systems in concrete and masonry substrates.
• 1/2 in. diameter x 6 in. length - a versatile mid-range size suited for common retrofit anchoring applications in existing structures.
• Nut and washer included - arrives as a ready-to-install assembly, eliminating the need to source matching hardware separately.
• Hot-dip galvanized finish - delivers heavy-duty corrosion resistance, making this bolt appropriate for exposed or moisture-prone environments.
• End-stamped rod length and color-coded steel grade - allows contractors and inspectors to quickly verify bolt specifications after installation without guesswork.
• No-Equal symbol stamped on each end - provides an additional layer of post-installation verification unique to 1/2 in. diameter and larger rods.

Why This Product

• A complete engineered anchoring system in one bolt - designed specifically to work with Simpson Strong-Tie adhesives, this retrofit bolt combines a precut threaded rod, nut, and washer into a single, coordinated solution for anchoring into existing concrete and masonry.
• Built-in post-installation traceability - the stamped rod length, color-coded steel grade indicator, and No-Equal symbol on each end mean job site verification and inspection are straightforward, even after the anchor has been set.
• Corrosion resistance where it counts - the hot-dip galvanized finish provides durable protection against rust and environmental exposure, making this threaded rod anchor a reliable choice for projects where long-term performance matters.
• Dual load capacity in a single fastener - by handling both tension and shear loads, this retrofit anchor bolt eliminates the need for multiple connection hardware types, simplifying design and installation on concrete and masonry anchoring projects.

Specifications

• MPN: RFB#4X6HDG
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Bolt Length: 6 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
• Connections requiring both tension and shear load resistance

What's Included

Each pack contains (1) RFB#4X6HDG Hot-Dip Galvanized Retrofit Bolt, Precut threaded rod, Nut, Washer.

Frequently Asked Questions

What adhesive should be used with the Simpson RFB#4X6HDG Retrofit Bolt?

The RFB#4X6HDG is designed to be used with Simpson Strong-Tie adhesives to anchor into existing concrete and masonry. When paired with a Simpson Strong-Tie adhesive, the RFB offers a complete engineered anchoring system.

How can I identify the bolt after it has been installed?

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 each end.

What type of loads does the RFB#4X6HDG support?

The Simpson Strong-Tie RFB#4X6HDG Retrofit Bolt provides both tension and shear loads in connections, making it suitable for a variety of anchoring applications in existing concrete and masonry.

Does the RFB#4X6HDG come with a nut and washer?

Yes, the RFB#4X6HDG is supplied as a precut threaded rod complete with both a nut and a washer included.

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