The Simpson Strong-Tie ATRM 1/2 in. x 24 in. All-Thread Rod, Grade 55 by Simpson Strong-Tie is a fully threaded tension transfer element engineered for structural systems designed to resist seismic and wind forces. This precut all-thread rod delivers a continuous and reliable load path from roof to foundation, making it a trusted solution for continuous rod tiedown systems used in shearwall overturning restraint and uplift restraint systems for roofs. The ATRM series is also well-suited for adhesive anchor rod applications, giving builders and engineers a versatile threaded rod option for demanding structural connections.

Key Features

• Precut 24 in. length - ready to install without field cutting, saving time and ensuring consistent dimensions on the job site.
• Meets Grade 55 specifications (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - delivers high yield and tensile strength to handle the demanding loads found in seismic and wind-resistant structural systems.
• UNC Class 2A thread specification - ensures precise thread fit and compatibility with standard nuts and couplers used in continuous rod tiedown assemblies.
• Uncoated black steel material - a straightforward, no-frills steel rod suited for interior structural applications where additional corrosion protection is not required.
• 1/2 in. rod diameter - a commonly specified size in shearwall tiedown systems, making this rod easy to integrate into engineered load path designs.
• Fully threaded along the entire length - allows flexible placement of nuts and hardware anywhere along the rod, simplifying installation and adjustment during assembly.

Why This Product

• Designed specifically as a tension transfer element for continuous rod tiedown systems, this all-thread rod addresses the critical need to transfer overturning and uplift forces reliably from roof to foundation in seismic and wind load scenarios.
• The precut 24 in. length reduces on-site preparation, allowing installers to move efficiently through shearwall overturning restraint and uplift restraint system installations without the delays of custom cutting.
• Grade 55 strength (Fy = 55 ksi, Fu = 75 ksi) to ASTM A36 standards means this threaded rod meets the structural specifications commonly called out in engineered drawings for seismic and wind force-resisting systems.
• Its fully threaded design paired with the UNC Class 2A thread specification makes this rod compatible with a wide range of hardware used in continuous rod tiedown assemblies, as well as adhesive anchor applications, providing genuine multi-use value on structural projects.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM4-2
• Rod Diameter: 1/2 in.
• Rod Length: 24 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Thread Specification: UNC Class 2A
• Grade: Grade 55
• Material Standard: ASTM A36; Fy = 55 ksi & Fu = 75 ksi
• Product Class: Threaded Rod
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

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

Frequently Asked Questions

What is this all-thread rod used for?

The Simpson Strong-Tie ATRM4-2 is a tension transfer element used in structural systems designed to resist seismic and wind forces. It is used within continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and as an adhesive anchor rod in a variety of other structural applications.

What are the strength specifications for this threaded rod?

This rod meets Grade 55 specifications per ASTM A36, with a yield strength (Fy) of 55 ksi and an ultimate tensile strength (Fu) of 75 ksi. The thread profile follows the UNC Class 2A specification.

Is this rod precut or does it require field cutting?

The ATRM4-2 is precut for convenience at a length of 24 in. with a diameter of 1/2 in., so no field cutting is required. This allows for faster, more consistent installation in tiedown and uplift restraint assemblies.

Does this threaded rod have any protective coating?

No - this rod is made from uncoated black steel with no protective coating applied. It is best suited for interior structural applications where additional corrosion resistance is not specified by the project design requirements.