The Simpson 5/8 in. x 16 in. Zinc-Plated Retrofit Bolt, Grade 36 is a precut threaded rod from Simpson that is supplied with a nut and washer for anchoring into existing concrete and masonry using compatible Simpson adhesives. When paired with a Simpson Strong-Tie adhesive, the retrofit bolt delivers a complete engineered anchoring system built to handle demanding structural connections. 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 quick and straightforward. The No-Equal symbol is also stamped on this 5/8 in. diameter rod, providing an additional layer of verification in the field.

Key Features

• Handles both tension and shear loads - supports a wide range of structural connection demands in a single fastener, reducing the need for supplemental hardware
• Coarse thread type - promotes reliable mechanical engagement with anchoring adhesives in concrete and masonry for a secure, stable hold
• 5/8 in. diameter x 16 in. length - provides substantial embedment depth for applications requiring greater load capacity in existing structures
• Zinc-plated finish - offers a baseline level of corrosion resistance suitable for standard anchoring environments
• End-stamped length markings and color-coded grade identification - allow installers and inspectors to quickly confirm rod specifications after installation without guesswork
• No-Equal symbol stamped on rod - gives added field verification that the correct grade and product type are in place, supporting inspection confidence
• Nut and washer included - all essential hardware ships with the bolt so the installation can proceed without sourcing additional components

Why This Product

• Engineered as a complete anchoring system - the retrofit bolt is designed specifically for use with Simpson Strong-Tie adhesives, meaning the rod, hardware, and adhesive work together as a coordinated, engineered solution rather than a collection of unmatched components
• Built-in post-installation traceability - the stamped rod length and color-coded grade markings on each end make it straightforward to verify the correct product is installed, a practical advantage during inspections and quality checks on retrofit and repair projects
• Dual-load capability in a single fastener - because the bolt handles both tension and shear loads, structural engineers and contractors can address multiple connection demands without specifying separate fasteners for each load direction
• Made in the United States to Grade 36 standards - the rod meets defined structural steel grade requirements, giving project teams confidence in consistent material performance for concrete and masonry anchoring applications

Specifications

• MPN: RFB#5X16
• Brand: Simpson Strong-Tie
• Diameter: 5/8 in.
• Bolt Length: 16 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#5X16 Retrofit Bolt, Precut threaded rod (5/8 in. x 16 in.), Nut, Washer.

Frequently Asked Questions

What adhesive should be used with the Simpson RFB#5X16 Retrofit Bolt?

The RFB#5X16 is designed for use with Simpson Strong-Tie adhesives to anchor into existing concrete and masonry, providing a complete engineered anchoring system.

How can I identify the grade of the rod 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. The No-Equal symbol is also stamped on the rod.

What types of loads does the RFB#5X16 support?

The Simpson RFB#5X16 Retrofit Bolt provides both tension and shear loads in connections, making it suitable for a variety of structural anchoring applications.

Does the RFB#5X16 come with the necessary hardware for installation?

Yes, the RFB#5X16 is supplied with both a nut and a washer, so the hardware needed to complete the installation is included with the bolt.

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