The Simpson Strong-Tie ATRM 1/2 in. x 48 in. All-Thread Rod, Grade 55 is a fully threaded structural rod engineered by Simpson Strong-Tie to serve as a tension transfer element in systems designed to resist seismic and wind forces. Built from uncoated black steel to ASTM A36 material standards with a minimum yield strength of 55 ksi, this precut threaded 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, uplift restraint systems for roofs, and adhesive anchor rod applications.

Key Features

• Precut 48 in. length - ready to install without on-site cutting, saving time and reducing material waste during structural assembly.
• Meets Grade 55 specifications (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - delivers the high tensile and yield strength required for seismic and wind force resistance in structural tiedown systems.
• UNC Class 2A thread specification - ensures precise, standardized thread fit for compatibility with nuts, couplers, and take-up devices used in continuous rod tiedown assemblies.
• Uncoated black steel construction - a fully threaded profile along the entire 48 in. length allows flexible positioning and versatile use across multiple structural applications.
• 1/2 in. rod diameter - sized for use in common Strong-Rod tiedown system configurations, providing the load-carrying capacity suited to light-frame wood construction overturning restraint.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind resistance, this all-thread rod supports a continuous load path from roof to foundation - addressing one of the most critical requirements in structural shearwall design.
• The precut 48 in. length eliminates field cutting and speeds up installation in continuous rod tiedown systems and uplift restraint applications, reducing labor time on the job site.
• Grade 55 ASTM A36 steel with Fy = 55 ksi and Fu = 75 ksi ensures the rod meets the structural performance demands of engineered tiedown systems without overspecifying material cost.
• The fully threaded design across the entire rod length means it can also serve as an adhesive anchor rod, giving contractors a single versatile product useful across multiple applications on the same project.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM4-4
• Rod Diameter: 1/2 in.
• Rod Length: 48 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Tensile Strength (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 ATRM4-4 is used as a tension transfer element in structural systems designed to resist seismic and wind forces. Primary applications include continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and use as an adhesive anchor rod in various construction scenarios.

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

This rod is manufactured from ASTM A36 uncoated black steel and meets Grade 55 specifications, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The thread profile follows UNC Class 2A specification for precise, standardized fit with compatible hardware.

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

The ATRM4-4 comes precut to a length of 48 in. with a diameter of 1/2 in., so no on-site cutting is required. This makes it ready for immediate use in continuous rod tiedown systems and other structural applications without additional preparation.

Does this threaded rod have any coating or corrosion protection?

No. The ATRM4-4 is uncoated black steel with no applied finish or corrosion-resistant coating. It is intended for use in dry or protected interior structural applications typical of continuous rod tiedown and overturning restraint systems in wood-frame construction.