The Simpson Strong-Tie ATRM 1/2 in. x 18 in. All-Thread Rod, Grade 55 is a fully threaded steel rod engineered by Simpson Strong-Tie to serve as a tension transfer element in structural systems designed to resist seismic and wind forces. This medium-strength threaded rod provides a continuous and reliable load path from roof to foundation, making it a critical component in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod applications. Precut to 18 inches and conforming to ASTM A36 material standards, the ATRM4-1.5 delivers dependable performance wherever a secure, full-thread connection is required.

Key Features

• Precut 18 in. length - arrives ready to install with no field cutting required, saving time and labor on the job site.
• Grade 55 specification (Fy = 55 ksi, Fu = 75 ksi) - provides medium-strength tensile and yield capacity to handle seismic and wind-driven overturning loads reliably.
• UNC Class 2A thread specification - ensures compatibility with standard nuts, couplers, and take-up devices used in continuous rod tiedown and uplift restraint assemblies.
• ASTM A36 uncoated black steel construction - delivers consistent, code-recognized material properties suited for structural load-path applications in protected interior environments.
• 1/2 in. rod diameter - fits standard Strong-Rod system hardware, couplers, and take-up devices designed for this thread size, simplifying system assembly.
• Fully threaded along the entire length - allows flexible positioning of nuts and connectors anywhere along the rod, adapting to varying installation depths and structural configurations.

Why This Product

• Engineered for continuous load-path systems - the ATRM is specifically designed as a tension transfer element, making it the correct choice for anchor tiedown systems (ATS) and uplift restraint systems (URS) where uninterrupted force transfer from roof to foundation is required.
• Versatile across multiple structural applications - beyond shearwall overturning restraint, this all-thread rod is suitable for use as an adhesive anchor rod, giving contractors a single product that works across a range of structural connection needs.
• Precut for job-site efficiency - at exactly 18 in., the rod eliminates the need for field measuring and cutting, reducing installation errors and keeping projects on schedule.
• Manufactured in the United States to recognized material standards - ASTM A36 compliance and Grade 55 certification mean the rod meets the material specifications required by engineers designing seismic- and wind-force-resisting systems.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM4-1.5
• Product Class: Threaded Rod
• Rod Diameter: 1/2 in.
• Rod Length: 18 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi & Fu = 75 ksi
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

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

Frequently Asked Questions

What structural applications is the Simpson Strong-Tie ATRM4-1.5 designed for?

The ATRM4-1.5 is designed as a tension transfer element for use in structural systems that resist seismic and wind forces. It is suitable for continuous rod tiedown systems used in shearwall overturning restraint, uplift restraint systems for roofs, and can also function as an adhesive anchor rod in a variety of applications.

What are the material and strength specifications for this threaded rod?

This all-thread rod is manufactured from uncoated ASTM A36 steel conforming to Grade 55 specifications, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The threads conform to UNC Class 2A specifications, ensuring standard compatibility with system hardware.

Is this rod compatible with standard Strong-Rod system components?

Yes. The 1/2 in. diameter and UNC Class 2A thread specification make this rod compatible with standard nuts, couplers, and take-up devices used in Simpson Strong-Tie Strong-Rod systems for continuous load-path assemblies.

Does this threaded rod require any field cutting before installation?

No. The ATRM4-1.5 is precut to exactly 18 in., so it arrives ready to install. This eliminates field measuring and cutting, streamlining installation in both shearwall tiedown and roof uplift restraint applications.