The Simpson Strong-Tie ATRM 7/8 in. x 48 in. All-Thread Rod, Grade 55 is a fully threaded structural steel rod engineered as a tension transfer element for systems designed to resist seismic and wind forces. Built from uncoated ASTM A36 black steel with a minimum yield strength of 55 ksi, this all-thread rod provides a continuous and reliable load path from roof to foundation - making it a trusted component in shearwall overturning restraint applications and uplift restraint systems for roofs. Its fully threaded design also makes it suitable for use as an adhesive anchor rod and a range of other structural fastening applications.

Key Features

• Precut 48 in. length - ready to install right out of the box, saving time on the job site without the need for cutting or measuring
• Meets Grade 55 specifications (ASTM A36; Fy = 55 ksi and Fu = 75 ksi) - delivers the tensile strength required for engineered structural tiedown and uplift restraint systems
• UNC Class 2A thread specification - ensures consistent, reliable thread engagement with compatible nuts and couplers used in continuous rod tiedown assemblies
• 7/8 in. rod diameter - sized for use in strong-rod systems where a larger-diameter rod is needed to handle greater structural loads
• Uncoated black steel construction - provides a clean, bare steel surface compatible with a variety of structural system components and adhesive anchor installations
• Fully threaded along the entire length - allows connection points at any location along the rod, giving installers maximum flexibility in positioning hardware within a load path assembly

Why This Product

• Designed specifically as a tension transfer element for seismic and wind-force-resisting structural systems, this all-thread rod supports continuous load path construction from roof to foundation - a critical requirement in high-wind and seismic design zones.
• The precut 48 in. length eliminates field cutting, reducing installation time and helping ensure consistent rod lengths across a tiedown system installation.
• Grade 55 steel with ASTM A36 certification means this threaded rod meets recognized engineering specifications, supporting use in engineered shearwall overturning restraint and roof uplift restraint designs.
• The fully threaded profile makes this rod equally suited for use as an adhesive anchor rod, giving structural contractors a single versatile component that works across multiple application types on the same job.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM7-4
• Rod Diameter: 7/8 in.
• Rod Length: 48 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi and Fu = 75 ksi
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• 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 and wind forces

Frequently Asked Questions

What is this all-thread rod used for in structural construction?

This fully threaded rod is used as a tension transfer element in structural systems designed to resist seismic and wind forces. Common applications include continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod installations. It provides a continuous and reliable load path from roof to foundation.

What material standard does the ATRM7-4 meet?

The ATRM7-4 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 all-thread rod. The thread form follows the UNC Class 2A specification.

Is this rod sold precut or does it require field cutting?

This rod comes precut to a length of 48 in. with a diameter of 7/8 in., so no field cutting is required. The precut format is designed for convenience and consistent installation across structural tiedown assemblies.

Does this rod have a protective coating?

No - the ATRM7-4 is made from uncoated black steel with no applied finish or coating. This bare steel surface is compatible with adhesive anchor applications and the hardware components commonly used in continuous rod tiedown and uplift restraint systems.