The Simpson ATR 3/4 in. x 18 in. Hot-Dip Galvanized All-Thread Rod by Simpson is a fully threaded steel tension transfer element engineered for use with Simpson Strong-Tie adhesives in structural anchoring applications. Whether the job calls for floor-to-floor holdown connections or a broad range of adhesive-based anchoring solutions, this all-thread rod delivers dependable performance where secure load transfer matters. The hot-dip galvanized finish provides extra corrosion resistance, making it a reliable choice for exterior environments and treated-wood applications where moisture and chemical exposure are ongoing concerns.

Key Features

• Fully threaded along the entire length - allows nuts, connectors, and hardware to be positioned anywhere along the 18 in. span, maximizing placement flexibility on the job site.
• Cut to length for convenience - can be trimmed to the exact dimension needed, reducing waste and saving time during installation.
• Hot-dip galvanized (HDG) finish - delivers extra corrosion resistance compared to standard zinc-plated finishes, making this rod well suited for exterior and treated-wood applications where durability is critical.
• 3/4 in. diameter, 18 in. length - sized for common structural holdown and anchoring applications, providing a strong cross-section capable of handling tension transfer demands.
• UNC Class 2A or 1A thread specifications - conforms to standard unified national coarse thread designations, ensuring broad compatibility with structural hardware, nuts, and connectors.

Why This Product

• Built for demanding structural connections - designed specifically as a tension transfer element for use with Simpson Strong-Tie adhesives, this fully threaded rod supports floor-to-floor holdowns and a wide range of anchoring solutions where load transfer integrity is essential.
• Hot-dip galvanization for long-term durability - the HDG coating provides a higher level of corrosion protection than standard zinc plating, making this rod a practical choice for exterior installations and applications involving treated wood, where chemical and moisture exposure can degrade lesser finishes over time.
• Full threading from end to end - because there are no unthreaded sections, installers gain complete flexibility in positioning hardware along the rod, reducing the need for workarounds and keeping structural connections precise.
• Made from steel with standardized thread specs - the combination of steel construction and UNC Class 2A or 1A threading ensures compatibility with widely used structural hardware, simplifying procurement and installation across multiple project types.

Specifications

• MPN: ATR3/4X18HDG
• Brand: Simpson Strong-Tie
• Material: Steel
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Diameter: 3/4 in.
• Length: 18 in.
• Thread Type: UNC Class 2A or 1A
• Country of Origin: United States

Approved Applications

• Floor-to-floor holdown connections
• Structural anchoring solutions with Simpson Strong-Tie adhesives
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood applications where moisture and chemical exposure demand a durable finish

Frequently Asked Questions

What makes the hot-dip galvanized finish beneficial for this all-thread rod?

Hot-dip galvanization (HDG) provides extra corrosion resistance compared to standard zinc-plated finishes, making this rod especially well suited for exterior environments and applications involving treated wood, where exposure to moisture and chemicals is a concern.

Is this rod fully threaded along its entire length?

Yes. The ATR3/4X18HDG is fully threaded along the entire 18 in. length of the rod, providing maximum flexibility for positioning nuts, connectors, and other hardware anywhere along its span.

What thread specification does this all-thread rod use?

This rod conforms to UNC Class 2A or 1A thread specifications, which are standard unified national coarse thread designations used in structural and construction hardware applications.

What applications is this all-thread rod designed for?

The ATR3/4X18HDG is a tension transfer element designed for use with Simpson Strong-Tie adhesives, providing versatility for structural applications including floor-to-floor holdowns along with a wide range of other anchoring solutions.

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