The Simpson ATR 5/8 in. x 18 in. Hot-Dip Galvanized All-Thread Rod is a fully threaded steel tension transfer element from Simpson, engineered for use with Simpson Strong-Tie adhesives in demanding structural anchoring applications. Threaded along its entire length, this all-thread rod delivers the versatility needed for floor-to-floor holdown installations and a wide range of other anchoring solutions. The hot-dip galvanized finish provides enhanced corrosion resistance, making this rod a dependable choice for exterior environments and treated-wood construction where long-term durability is critical.

Key Features

• Fully threaded along the entire length - gives you maximum flexibility to cut the rod to your exact required length without sacrificing thread engagement at any point.
• Hot-dip galvanized coating - provides extra corrosion resistance compared to standard zinc-plated finishes, keeping the rod protected in exterior conditions and against the chemicals present in treated wood.
• 5/8 in. diameter and 18 in. length - a robust, commonly specified size well suited to floor-to-floor holdown assemblies and structural adhesive anchoring systems.
• UNC Class 2A or 1A thread specification - conforms to established industry thread standards, ensuring reliable fitment with compatible nuts and hardware.
• Designed for use with Simpson Strong-Tie adhesives - functions as part of a coordinated tension transfer system, making it straightforward to specify and detail within a Simpson Strong-Tie anchoring assembly.

Why This Product

• Built for corrosive and chemically aggressive environments - the hot-dip galvanized finish is specifically suited for exterior applications and treated-wood assemblies where lesser-coated threaded rods are prone to premature corrosion and reduced service life.
• Versatile across multiple structural applications - from floor-to-floor holdowns to a broad range of adhesive anchoring solutions, this fully threaded rod adapts to varied project demands without requiring multiple specialized fasteners.
• Cut-to-length convenience built in - because threads run the full 18 in. of the rod, installers can trim it to any required dimension on site while retaining full thread engagement, reducing waste and saving time.
• Sourced from a trusted structural connector brand - Simpson products are widely specified by engineers and contractors in structural applications, giving you confidence that this all-thread rod is designed and tested to perform as part of a cohesive anchoring system.

Specifications

• MPN: ATR5/8X18HDG
• Brand: Simpson Strong-Tie
• Material: Steel
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Diameter: 5/8 in.
• Length: 18 in.
• Thread Specification: UNC Class 2A or 1A
• Country of Origin: United States

Approved Applications

• Tension transfer in structural anchoring systems
• Floor-to-floor holdown applications
• Use with Simpson Strong-Tie adhesives
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood construction applications

Frequently Asked Questions

What finish does the ATR5/8X18HDG have, and why does it matter?

This all-thread rod features a hot-dip galvanized (HDG) finish, which offers extra corrosion resistance compared to zinc-plated alternatives. This makes it particularly suitable for exterior applications and use with treated wood, where moisture and chemical exposure can accelerate corrosion on lesser-coated fasteners.

Is the ATR5/8X18HDG fully threaded along its entire length?

Yes. This rod is fully threaded along its entire 18-inch length, providing maximum flexibility for cutting to the exact length needed for your specific application.

What thread specification does this all-thread rod use?

The ATR5/8X18HDG conforms to UNC Class 2A or 1A thread specifications. When pairing this rod with a nut, the material and finish of the nut must match the rod to ensure proper fit and performance.

What is this all-thread rod designed to be used with?

This Simpson Strong-Tie ATR all-thread rod is designed for use as a tension transfer element in conjunction with Simpson Strong-Tie adhesives, supporting structural applications such as floor-to-floor holdowns and a variety of other anchoring solutions.

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