Key Features
Complete Anchor Assembly The nut and washer come assembled on the retrofit bolt, so you are not piecing together parts in the field. That speeds up installs and helps keep anchoring layouts consistent. Built for Adhesive Anchoring This Simpson Strong-Tie retrofit bolt is made for threaded-rod anchoring with Simpson Strong-Tie adhesive. You get a purpose-built anchor component instead of cutting threaded rod on the job. Easy ID After Install Stamped length markings and head identification make it easier to verify what was installed later. On 1/2 inch diameter and larger bolts, the No-Equal symbol also helps with fast visual confirmation.
Overview
The Simpson Strong-Tie RFB#5X10HDG Hot-Dip Galvanized Retrofit Bolt is a precut threaded retrofit bolt for adhesive anchoring in existing concrete and masonry. This is a retrofit bolt designed for threaded-rod anchoring. Model Number: RFB#5X10HDG. For contractors, installers, and serious builders who need a clean, ready-to-install anchor component, this setup cuts out the extra step of measuring and cutting loose rod on site.
What matters here is that this is not just a piece of generic threaded rod. Simpson Strong-Tie supplies the RFB with the nut and washer already assembled, which gives you a more complete anchoring assembly right out of the box. On a job where time matters and consistency matters even more, that saves handling time and helps reduce mistakes during layout and install.
This specific version is sized at 5/8 in. x 10 in. and uses ASTM F1554 Grade 36 steel with a hot-dip galvanized finish. In practical terms, that means you are getting a common structural anchor size with corrosion protection suited for applications where a zinc-plated part would not be the right call. If finish matters for the environment or spec book, the hot-dip galvanized coating is a key reason to choose this model over the zinc-plated version.
The RFB line is designed to work as part of a complete engineered anchoring system when paired with Simpson Strong-Tie adhesive. That is the real value of this product. Instead of sourcing rod, nuts, and washers separately and hoping everything matches the application, you are using a bolt intended for adhesive anchor installations from the start. That is cleaner, more straightforward, and easier to standardize across crews and repeat jobs.
Another detail worth noting is identification after installation. Simpson Strong-Tie stamps the bolt length on the head, and for diameters 1/2 inch and larger, the head also carries the No-Equal symbol. The product family also uses color-coded painted heads by grade or material for easier visual ID. On inspection-heavy work or jobs where you need to verify installed hardware later, that is a useful detail, not just a catalog talking point.
For day-to-day use, this bolt fits best anywhere you are anchoring into existing concrete or masonry with adhesive and want a purpose-built threaded anchor component. That includes structural retrofits, equipment anchoring, rack support work, and general construction anchoring where a precut threaded rod assembly is the right answer. If you want jobsite convenience, known material spec, and a finish that matches tougher exposure requirements, this is the kind of anchoring hardware that earns its keep.
Precut for Faster, Cleaner Installs
This setup is built for crews that want to move faster without giving up consistency. Because the rod is precut and the hardware is already on it, you spend less time prepping anchor components in the field.
- 5/8 in. diameter by 10 in. length for threaded-rod anchoring applications
- Nut and washer are supplied assembled on the retrofit bolt
What’s in the Box
- (1) Simpson Strong-Tie RFB#5X10HDG retrofit bolt
- (1) Assembled nut
- (1) Assembled washer
Adhesive is not included.
Key Specifications
| Size | 5/8 in. x 10 in. |
|---|---|
| Material | ASTM F1554 Grade 36 |
| Finish | Hot-Dip Galvanized |
| Application | Threaded-Rod Anchoring |
| Packaging Quantity | 1 |
| Carton Quantity | 25 |
| API Approval | Approved – Full |
| Head Style | Hex |
Compatibility
Adhesive Anchoring System Designed to provide a complete engineered anchoring system when used with Simpson Strong-Tie adhesive. Anchor Format Precut threaded retrofit bolt format for existing concrete and masonry anchoring applications.
Built For
Construction Concrete Anchoring Masonry Anchoring Structural Retrofit Work General Contracting Commercial Installations
Pro Tip
Before the bolt goes in the hole, check the head stamp. On 1/2 inch diameter and larger RFBs like this one, the stamped length and No-Equal symbol make it easier to confirm you grabbed the right anchor without measuring every piece.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie RFB#5X10HDG Hot-Dip Galvanized Retrofit Bolt Keeps Anchoring Simple
This is the kind of anchoring hardware that saves time because it shows up ready to work, not ready to be cut, sorted, and chased around the truck.
- Who it’s for: Contractors and installers anchoring into existing concrete or masonry with adhesive who want a precut 5/8 in. threaded bolt assembly.
- Why it stands out: You get the nut and washer already assembled, ASTM F1554 Grade 36 material, and a hot-dip galvanized finish in one purpose-built package.
- Worth knowing: This is an anchor component meant to be used with adhesive, so make sure your adhesive system matches the job requirements.
Common Questions
- What is this product used for? It is used for threaded-rod anchoring as part of an adhesive anchoring system in existing concrete and masonry.
- Does the bolt include hardware? Yes. The nut and washer come fully assembled on the retrofit bolt.
- What material and finish does this model use? This model uses ASTM F1554 Grade 36 material with a hot-dip galvanized finish.
- How can you identify the bolt after installation? The head is stamped with the length, and on diameters 1/2 inch and larger it also includes the No-Equal symbol for visual identification.
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