The Simpson Strong-Tie ATRM 1-1/4 in. x 36 in. All-Thread Rod, Grade 55 is a fully threaded steel rod engineered as a tension transfer element for structural systems designed to resist seismic and wind forces. By providing a continuous and reliable load path from roof to foundation, this threaded rod is a core component in continuous rod tiedown systems for shearwall overturning restraint as well as uplift restraint systems for roofs. Its versatility also extends to use as an adhesive anchor rod, making it a practical choice for contractors and structural engineers who need a dependable, precut all-thread rod ready to install.

Key Features

• Precut 36 in. length - arrives ready to use without additional cutting, saving time on the job site and reducing material waste.
• Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - delivers a minimum yield strength of 55 ksi and ultimate strength of 75 ksi, providing the structural integrity required for seismic and wind-load applications.
• UNC Class 2A thread specification - ensures consistent, standard threading that mates correctly with compatible nuts and couplers used in continuous rod tiedown systems.
• 1-1/4 in. rod diameter - sized for high-load structural applications including shearwall overturning restraint and roof uplift restraint where a larger diameter rod is required.
• Uncoated black steel finish - keeps the rod lightweight and free of coating interference, well-suited for interior structural applications where corrosion exposure is not a concern.
• Fully threaded along the entire 36 in. length - allows the rod to be cut or positioned at any point along its length without losing thread engagement, maximizing flexibility in installation.

Why This Product

• Designed specifically as a tension transfer element for continuous load path systems, this all-thread rod directly addresses the structural demand of transferring seismic and wind forces from roof to foundation - a requirement in modern building codes for high-demand construction zones.
• The Grade 55 rating (Fy = 55 ksi, Fu = 75 ksi) meets the strength demands of shearwall overturning restraint and roof uplift restraint systems, giving engineers and inspectors a verifiable, code-compliant material specification to rely on.
• Because the rod is precut to 36 in. and fully threaded end-to-end, it eliminates the need for on-site fabrication and works equally well as an adhesive anchor rod, reducing the number of separate components a contractor needs to carry.
• Made in the United States by Simpson Strong-Tie, a recognized name in structural connectors and tiedown systems, this rod is purpose-built to integrate within Strong-Rod Systems for shearwall and roof applications.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM10-3
• Product Class: Threaded Rod
• Rod Diameter: 1-1/4 in.
• Rod Length: 36 in.
• Thread Specification: UNC Class 2A
• Grade: Grade 55
• 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 system for shearwall overturning restraint
• Uplift restraint system 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 ATRM10-3 is a tension transfer element used in structural systems designed to resist seismic and wind forces. It provides a continuous and reliable load path from roof to foundation and is suitable for use in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and as an adhesive anchor rod.

What are the strength specifications for this threaded rod?

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

Is this rod precut or does it need to be cut to length on site?

The ATRM10-3 is precut to a length of 36 in. with a diameter of 1-1/4 in., so it arrives ready to install without requiring any additional cutting in most standard applications.

What finish does this rod have, and is it suitable for exterior or wet environments?

This rod features an uncoated black steel finish. It is uncoated steel with no protective coating applied. For applications involving exposure to moisture, corrosive environments, or pressure-treated lumber, a rod with an appropriate protective finish should be considered instead.