The Simpson ATR Zinc-Plated All-Thread Rod 1-1/8 in. x 18 in. by Simpson Strong-Tie is a fully threaded tension transfer element engineered for demanding structural applications. Designed for use with Simpson Strong-Tie adhesives, this all-thread rod is well suited for floor-to-floor holdowns and a wide range of anchoring solutions where consistent thread engagement along the full rod length is critical. The zinc-plated steel construction delivers a layer of corrosion resistance, making it a dependable choice for structural assemblies that require a reliable, code-compatible threaded rod.

Key Features

• Fully threaded along the entire length - threads run from end to end, giving you maximum flexibility in positioning nuts and hardware anywhere along the rod without dead zones.
• 1-1/8 in. diameter - a robust cross-section suited to heavy-duty tension transfer demands in structural holdown and anchoring applications.
• 18 in. length, cut to length for convenience - the rod arrives ready to use and can be cut to meet job-specific dimensional requirements, reducing field labor and material waste.
• Zinc-plated steel construction - the zinc-plated finish provides corrosion resistance over a steel core, supporting long-term performance in structural assemblies.
• UNC Class 2A or 1A thread specifications - conforms to standard UNC thread tolerances, ensuring compatibility with standard UNC-threaded nuts and mating hardware that share the same material and finish.

Why This Product

• Purpose-built for Simpson Strong-Tie adhesive systems - this all-thread rod is specifically designed as a tension transfer element for use with Simpson Strong-Tie adhesives, so it integrates directly into proven structural anchoring assemblies without guesswork on compatibility.
• Versatile across multiple structural applications - from floor-to-floor holdowns to a wide range of other anchoring solutions, the fully threaded design means one rod can serve multiple roles on the job site.
• Cut-to-length convenience reduces field modifications - because the rod is fully threaded end to end, cutting it to a custom length at any point still leaves usable threads, preserving function and saving installation time.
• Domestic production with a zinc-plated finish option - made in the United States and available in zinc-plated or hot-dipped galvanized finishes, allowing contractors to match the corrosion protection level to the demands of their specific application.

Specifications

• MPN: ATR1-1/8X18ZP
• Brand: Simpson Strong-Tie
• Material: Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Diameter: 1-1/8 in.
• Length: 18 in.
• Thread Type: UNC Class 2A or 1A
• Country of Origin: United States

Approved Applications

• Floor-to-floor holdowns in structural assemblies
• Use with Simpson Strong-Tie adhesives as a tension transfer element
• Structural anchoring solutions requiring fully threaded rod

Frequently Asked Questions

What is the diameter and length of this all-thread rod?

This Simpson Strong-Tie ATR all-thread rod has a diameter of 1-1/8 in. and a length of 18 in.

What thread specification does this rod conform to?

This rod meets UNC Class 2A or 1A thread specifications, ensuring compatibility with standard UNC-threaded nuts and hardware that match the same material and finish.

What finish is applied to this all-thread rod?

This rod features a zinc-plated finish over steel construction, providing a layer of corrosion resistance suitable for the intended structural applications. The coated ATR rods are also available with a hot-dipped galvanized finish for environments requiring greater protection.

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

The Simpson Strong-Tie ATR is designed as a tension transfer element for use with Simpson Strong-Tie adhesives, and is well suited for structural applications such as floor-to-floor holdowns and 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.