The Simpson Strong-Tie ATRM 1-1/4 in. x 18 in. All-Thread Rod, Grade 55 is a fully threaded steel rod engineered to serve as a tension transfer element in structural systems designed to resist seismic and wind forces - delivering a continuous and reliable load path from roof to foundation. Built from uncoated black steel and meeting Grade 55 specifications, this all-thread rod is a trusted component in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and a variety of other structural anchoring applications including use as an adhesive anchor rod.

Key Features

• Precut to 18 in. length - ready to install right out of the package, saving time on the jobsite without the need for field cutting or measuring.
• Meets Grade 55 specifications (ASTM A36; Fy = 55 ksi and Fu = 75 ksi) - delivers confirmed medium-strength performance for structural tiedown and uplift restraint applications where load capacity is critical.
• UNC Class 2A thread specification - ensures compatibility with standard structural hardware, couplers, and bearing plates used in continuous rod systems.
• 1-1/4 in. rod diameter - provides a substantial cross-section suited to high-load structural connections in shearwall and roof uplift restraint assemblies.
• Uncoated black steel construction - a clean, bare steel finish that is easy to inspect, field-verify, and integrate into engineered structural systems.
• Fully threaded along the entire rod length - allows flexible placement and adjustment within tiedown assemblies, eliminating positioning restrictions during installation.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind force resistance - making it an engineered solution for continuous load path systems where structural integrity from roof to foundation is required.
• Precut to a standard 18 in. length, reducing layout and prep time on projects where this rod dimension fits common anchor tiedown system (ATS) configurations and uplift restraint system (URS) installations.
• Fully threaded construction allows the rod to be positioned and connected at any point along its length - offering flexibility that solid or partially threaded rods cannot provide in tiedown and anchor applications.
• Grade 55 strength with ASTM A36 material standards provides verified mechanical properties - Fy = 55 ksi and Fu = 75 ksi - giving engineers and inspectors the documented performance data needed for code-compliant structural designs.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM10-1.5
• Product Class: Threaded Rod
• Rod Diameter: 1-1/4 in.
• Rod Length: 18 in.
• Color: Black
• Finish: Uncoated Steel
• Material: Uncoated Steel
• Thread Specification: UNC Class 2A
• Grade: Grade 55
• Material Standard: ASTM A36; Fy = 55 ksi and Fu = 75 ksi
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

• Continuous rod tiedown systems for shearwall overturning restraint
• Uplift restraint systems for roof applications
• Adhesive anchor rod applications
• Structural systems designed to resist seismic forces
• Structural systems designed to resist wind forces

Frequently Asked Questions

What structural applications is this all-thread rod designed for?

This fully threaded rod is designed for use as a tension transfer element in structural systems that resist seismic and wind forces. It is commonly used in continuous rod tiedown systems for shearwall overturning restraint, in uplift restraint systems for roofs, and as an adhesive anchor rod in a variety of anchoring applications.

What are the mechanical strength properties of this rod?

This rod meets Grade 55 specifications and conforms to ASTM A36 material standards, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi, providing verified medium-strength performance for engineered structural connections.

What thread type does this rod use, and why does it matter?

This rod uses a UNC Class 2A thread specification. This is a standard unified coarse thread classification that ensures compatibility with couplers, bearing plates, and other threaded hardware commonly used in tiedown and anchor assemblies.

Does this rod come with a coating or corrosion protection?

No - this rod is made from uncoated black steel with no applied coating or finish. It is intended for use in applications where coating is not required by the design. The uncoated surface also makes the rod easy to inspect and field-verify during installation.