The Simpson 1/2 in. x 10 in. Zinc-Plated Retrofit Bolt is a precut threaded rod from Simpson supplied with a nut and washer, engineered for use with anchoring adhesives to anchor into existing concrete and masonry. When paired with a Simpson Strong-Tie adhesive, this retrofit bolt becomes part of 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 straightforward. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod.

Key Features

• Handles both tension and shear loads - provides reliable structural performance across a range of anchoring applications in existing concrete and masonry
• Coarse thread type - promotes strong mechanical engagement with anchoring adhesives for a secure, stable hold
• End-stamped rod length in inches - allows quick, accurate identification after installation without guesswork on the job site
• Color-coded grade identification - lets installers confirm the grade or type of steel at a glance, even after the bolt is set
• No-Equal symbol stamped on rod - provides an additional verification mark specific to 1/2 in. diameter and larger bolts for added post-installation confidence
• Zinc-plated finish - delivers a corrosion-resistant surface treatment suited to typical anchoring environments
• Supplied with nut and washer - arrives ready for use as part of a complete anchoring assembly, reducing the need to source additional hardware

Why This Product

• A complete engineered anchoring solution - when used with a Simpson Strong-Tie adhesive, the retrofit bolt forms a fully engineered system designed for anchoring into existing concrete and masonry, giving contractors and builders a cohesive, tested approach rather than mixing unmatched components
• Dual-load capability in a single fastener - the ability to carry both tension and shear loads means this threaded rod anchor can serve a wider range of structural connection requirements without the need for multiple fastener types
• Built-in post-installation verification - the stamped rod length, color-coded steel grade, and No-Equal symbol make it easy to confirm the correct bolt is installed, supporting quality control and inspection processes on site
• Precut and hardware-ready - arriving as a precut threaded rod with a nut and washer included, this bolt reduces prep time and keeps the installation process efficient from the start

Specifications

• MPN: RFB#4X10
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Bolt Length: 10 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
• Structural connections requiring both tension and shear load capacity

What's Included

Each pack contains (1) RFB#4X10 Retrofit Bolt, Pre-cut threaded rod, Nut, Washer.

Frequently Asked Questions

What adhesive should be used with the Simpson RFB#4X10 Retrofit Bolt?

The RFB#4X10 is designed for use with Simpson Strong-Tie adhesives to anchor into existing concrete and masonry. Using a Simpson Strong-Tie adhesive together with this bolt creates a complete engineered anchoring system.

How do I identify the RFB#4X10 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. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod, making post-installation identification quick and easy.

What types of loads can the RFB#4X10 Retrofit Bolt handle?

The RFB#4X10 provides both tension and shear loads in connections, making it suitable for a variety of structural anchoring applications in existing concrete and masonry.

Does the RFB#4X10 come with a nut and washer?

Yes. The Simpson Strong-Tie RFB#4X10 is supplied as a pre-cut threaded rod complete with a nut and washer included.

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