The Simpson 5/8 in. x 12 in. Hot-Dip Galvanized Retrofit Bolt from Simpson is a precut threaded rod supplied complete with a nut and washer, engineered to anchor into existing concrete and masonry when used with Simpson Strong-Tie anchoring adhesives. Each end of the 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 after installation. For diameters of 1/2 in. and larger, the distinctive No-Equal symbol is also stamped on the rod ends. When paired with a compatible Simpson Strong-Tie adhesive, this retrofit bolt delivers a complete engineered anchoring system built for structurally demanding connections.

Key Features

• Handles both tension and shear loads - engineered to resist multiple load types simultaneously, making it suitable for structurally critical anchoring connections in concrete and masonry
• Coarse thread type - provides strong mechanical engagement with the nut and within adhesive-anchored applications, supporting reliable load transfer
• Hot-dip galvanized finish - delivers robust corrosion resistance for use in demanding or moisture-exposed environments where long-term durability is required
• End-stamped rod length and color-coded steel grade - enables quick and easy identification of bolt length and material type post-installation, reducing verification time on the job
• No-Equal symbol stamped on rod ends (for 1/2 in. diameter and larger) - provides an additional layer of identification confidence for inspectors and installers after adhesive has been applied
• Nut and washer included - arrives as a ready-to-install assembly, eliminating the need to source additional hardware separately
• Designed for use with Simpson Strong-Tie adhesives - integrates into a complete engineered anchoring system when combined with compatible Simpson Strong-Tie anchoring adhesive products

Why This Product

• A complete, system-engineered anchoring solution - the retrofit bolt is designed to work in conjunction with Simpson Strong-Tie adhesives, forming a fully engineered system for anchoring threaded rod into existing concrete and masonry rather than relying on mismatched components
• Built-in post-installation identification - the stamped rod length and color-coded steel grade on each end mean the bolt can be verified after the adhesive has set, adding a practical quality-control advantage on jobsites where inspection matters
• Dual-load capability in a single fastener - by resisting both tension and shear forces, this anchor bolt eliminates the need for separate fasteners in connections that experience combined loading, simplifying the overall connection design
• Hot-dip galvanized protection for long-term performance - the hot-dip galvanized coating provides a level of corrosion resistance well-suited to exterior, embedded, or high-moisture applications where a standard zinc-plated bolt would fall short

Specifications

• Manufacturer Part Number (MPN): RFB#5X12HDGP2
• Brand: Simpson Strong-Tie
• Diameter: 5/8 in.
• Bolt Length: 12 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

Sold as packs of (2) Hot-Dip Galvanized Retrofit Bolts, Precut hot-dip galvanized threaded rod (5/8 in. x 12 in.), Nut, Washer.

Frequently Asked Questions

What type of base materials can the RFB Retrofit Bolt be used to anchor into?

The Simpson Strong-Tie RFB Retrofit Bolt is designed to anchor into existing concrete and masonry when used with a compatible Simpson Strong-Tie anchoring adhesive.

How can the RFB Retrofit Bolt be identified 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, enabling quick and easy identification post-installation. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod ends.

What type of loads does the RFB Retrofit Bolt support?

The RFB Retrofit Bolt is engineered to provide resistance to both tension and shear loads in anchoring connections, making it suitable for structurally demanding applications.

Does the RFB Retrofit Bolt need to be used with an adhesive?

Yes. The RFB Retrofit Bolt is intended for use with Simpson Strong-Tie adhesives. When combined with a compatible Simpson Strong-Tie adhesive, the RFB forms a complete engineered anchoring system.

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