The Simpson Strong-Tie ATRM 1/2 in. x 12 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 precut all-thread rod delivers a continuous and reliable load path from roof to foundation, making it a critical component in continuous rod tiedown systems for shearwall overturning restraint and uplift restraint systems for roof applications. Built from uncoated black steel to ASTM A36 standards with a minimum yield strength of 55 ksi, this threaded rod is also well-suited for use as an adhesive anchor rod in a wide range of structural and construction applications.

Key Features

• Precut 12 in. length - ready to install right out of the package, saving time on the job site and eliminating the need to cut or measure rod stock on site.
• Meets Grade 55 specifications (Fy = 55 ksi, Fu = 75 ksi) - provides the high tensile and yield strength required for structural load-path applications involving seismic and wind forces.
• ASTM A36 material standard - ensures consistent, code-recognized steel quality for structural use in tiedown and anchor systems.
• UNC Class 2A thread specification - delivers precise threading compatibility with standard nuts, couplers, and hardware used in Strong-Rod and similar tiedown systems.
• Uncoated black steel finish - a straightforward, practical choice for interior or protected structural applications where corrosion-resistant coatings are not required.
• 1/2 in. rod diameter - a widely used size that integrates easily into continuous rod tiedown assemblies and adhesive anchor applications.
• Fully threaded along the entire length - allows positioning flexibility during installation, so hardware can be secured at any point along the rod without repositioning constraints.

Why This Product

• Designed for seismic and wind force resistance - this all-thread rod is specifically engineered as a tension transfer element in structural systems that must resist lateral loads, giving builders a purpose-built component rather than a generic rod.
• Supports multiple structural applications in one product - the ATRM works in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and as an adhesive anchor rod, reducing the number of different components to source and stock.
• Grade 55 strength in a precut format - the combination of high-strength ASTM A36 steel at 55 ksi yield and a precut 12 in. length means fewer field cuts, consistent performance, and faster assembly on structural projects.
• Made in the United States - domestic origin supports traceability and quality confidence for projects with sourcing requirements or quality assurance programs.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM4-1
• Rod Diameter: 1/2 in.
• Rod Length: 12 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Ultimate Strength (Fu): 75 ksi
• Grade: Grade 55
• 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 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 systems is the ATRM4-1 all-thread rod designed for?

The ATRM4-1 is designed for use in structural systems that resist seismic and wind forces. It functions as a tension transfer element in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roof applications. It can also be used as an adhesive anchor rod in other structural applications.

What are the strength ratings for this Grade 55 threaded rod?

The ATRM4-1 meets ASTM A36 material standards with a minimum yield strength (Fy) of 55 ksi and an ultimate tensile strength (Fu) of 75 ksi, qualifying it as a Grade 55 threaded rod for structural applications.

What thread specification does the ATRM4-1 use?

This all-thread rod uses a UNC Class 2A thread specification, which provides compatibility with standard nuts, couplers, and other hardware commonly used in tiedown and anchor rod assemblies.

Is the ATRM4-1 fully threaded along its entire length?

Yes, the ATRM4-1 is a fully threaded rod - also referred to as an all-thread rod - meaning threads run the complete 12 in. length of the rod. This allows hardware to be positioned and secured at any point along the rod, providing installation flexibility in tiedown and anchor applications.