The Simpson 5/8 in. x 8 in. Zinc-Plated Retrofit Bolt is a precut threaded rod from Simpson that is supplied with a nut and washer, engineered for use with anchoring adhesives to anchor into existing concrete and masonry. 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 identification post-installation. The distinctive No-Equal symbol is also stamped on this 5/8 in. diameter rod, and when paired with a Simpson Strong-Tie adhesive, the retrofit bolt becomes part of a complete engineered anchoring system built for demanding structural connections.

Key Features

• Handles both tension and shear loads - supports structural connections where forces act in multiple directions, reducing the need for additional hardware
• Coarse thread type - promotes reliable mechanical engagement with the nut for a secure, stable hold in anchoring applications
• End-stamped rod length and color-coded grade markings - allow for fast, accurate identification of the bolt after installation, minimizing verification errors on the job
• No-Equal symbol stamped on the rod - provides a clear, permanent indicator of rod type directly on the fastener, supporting inspection and quality control
• Zinc-plated finish - offers a protective coating that helps guard the steel rod against corrosion in typical concrete and masonry anchoring environments
• Supplied with nut and washer - delivers a ready-to-install assembly that streamlines prep work and keeps hardware organized on site

Why This Product

• A complete anchoring solution in one package - the precut threaded rod, nut, and washer arrive together, and when combined with a Simpson Strong-Tie adhesive, form a fully engineered system for anchoring into existing concrete and masonry without sourcing components separately
• Built-in post-installation identification - stamped rod length and color-coded grade markings on each end make it straightforward to confirm bolt specs after the pour or installation is complete, a practical advantage during inspections
• Versatile load performance - the ability to carry both tension and shear loads in a single fastener means this retrofit bolt can serve a wide range of structural connection scenarios without requiring supplemental anchors
• Made in the United States to Grade 36 standards - the defined steel grade and domestic production support consistent material quality for applications where engineering documentation and traceability matter

Specifications

• Manufacturer Part Number (MPN): RFB#5X8
• Diameter: 5/8 in.
• Bolt Length: 8 in.
• Thread Type: Coarse
• Grade: Grade 36
• Coating: Zinc Plated
• Finish: Zinc Plated
• Country of Origin: United States

Approved Applications

• Anchoring into existing concrete using Simpson Strong-Tie adhesives
• Anchoring into existing masonry using Simpson Strong-Tie adhesives
• Connections requiring both tension and shear load capacity

What's Included

Each pack contains (1) RFB#5X8 Retrofit Bolt, Precut threaded rod (5/8 in. x 8 in.), Nut, Washer.

Frequently Asked Questions

What is the Simpson RFB#5X8 used for?

The Simpson Strong-Tie RFB#5X8 is a precut threaded rod used with anchoring adhesives to anchor into existing concrete and masonry. It is designed to provide both tension and shear load capacity in structural connections.

What adhesive should be used with the RFB#5X8 retrofit bolt?

The RFB#5X8 is designed for use with Simpson Strong-Tie adhesives. When paired together, they form a complete engineered anchoring system for concrete and masonry applications.

How is the RFB#5X8 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, allowing for quick and easy identification post-installation. The distinctive No-Equal symbol is also stamped on this 5/8 in. diameter rod.

Does the RFB#5X8 come with hardware?

Yes. The Simpson Strong-Tie RFB#5X8 is supplied with both a nut and a washer, providing everything needed to complete the anchoring connection alongside the appropriate Simpson Strong-Tie adhesive.

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