Product Description
The Simpson 1/2 in. x 4 in. Zinc-Plated Retrofit Bolt, Grade 36 is a precut threaded rod from Simpson, supplied complete with a nut and washer, and engineered for use with anchoring adhesives to anchor into existing concrete and masonry. Designed to handle both tension and shear loads in connections, this retrofit bolt pairs with compatible Simpson Strong-Tie adhesives to form a complete engineered anchoring system - making it a dependable solution for structural anchoring applications where reliability and post-installation traceability matter.
Key Features
- Handles both tension and shear loads - delivers versatile structural performance in a single fastener, reducing the need for multiple connection solutions
- Coarse thread type - promotes strong mechanical engagement with adhesive anchoring systems for secure, long-lasting connections
- Rod length stamped on each end - allows for quick and easy identification after installation, saving time during inspection and verification
- Color-coded to indicate grade or type of steel - provides at-a-glance confirmation of material grade post-installation, supporting quality control on the job
- No-Equal symbol stamped on rod - a distinctive marking present on 1/2 in. diameter and larger rods, helping confirm authentic Simpson hardware in the field
- Zinc-plated finish - provides a protective coating that helps resist corrosion in typical anchoring environments
- Nut and washer included - arrives as a ready-to-use assembly, eliminating the need to source additional hardware separately
Why This Product
- A complete engineered anchoring system - when paired with Simpson Strong-Tie adhesives, this retrofit bolt delivers a fully engineered solution for anchoring into existing concrete and masonry, giving contractors confidence that all components are designed to work together
- Built-in post-installation identification - stamped rod length and color-coded steel grade markings make it straightforward to verify the correct bolt was installed, which is especially valuable during inspections or on multi-phase projects
- Dual-load capability in one fastener - the ability to resist both tension and shear forces means this single bolt addresses multiple structural demands, simplifying connection design and reducing the number of components needed
- Domestic-grade quality with traceable marking - the No-Equal symbol stamped on every 1/2 in. and larger rod serves as a built-in authenticity marker, helping ensure the hardware in place meets the specification originally called for
Specifications
- MPN: RFB#4X4
- Brand: Simpson Strong-Tie
- Diameter: 1/2 in.
- Bolt Length: 4 in.
- Thread Type: Coarse
- Grade: Grade 36
- Finish: Zinc Plated
- Coating: 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 resistance
What's Included
Each pack contains (1) RFB#4X4 Retrofit Bolt, Precut threaded rod, Nut, Washer.
Note: Product dimensions and/or length may differ from picture. Please see the item description above for specifications.
Frequently Asked Questions
What is the Simpson RFB#4X4 used for?
The Simpson Strong-Tie RFB retrofit bolt 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 loads in connections, forming a complete engineered anchoring system when used with a compatible Simpson Strong-Tie adhesive.
What size is the RFB#4X4?
The RFB#4X4 has a diameter of 1/2 in. and a bolt length of 4 in. It features a coarse thread type.
How do you identify the RFB#4X4 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 for quick and easy identification post-installation. For 1/2 in. diameters and larger, the distinctive No-Equal symbol is also stamped on the rod.
What adhesive should be used with the RFB#4X4?
The RFB#4X4 is designed for use with Simpson Strong-Tie adhesives to anchor into existing concrete and masonry, creating a complete engineered anchoring system.
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