The Simpson Strong-Tie ATRM 5/8 in. x 48 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. Built to provide a continuous and reliable load path from roof to foundation, this all-thread rod is a critical component in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roof applications. Its fully threaded design also makes it well suited for use as an adhesive anchor rod and a range of other structural fastening applications.

Key Features

• Precut 48 in. length - arrives ready to install without cutting, saving time on the job site and reducing setup effort.
• Grade 55 specification (ASTM A36; Fy = 55 ksi and Fu = 75 ksi) - delivers the tensile and yield strength required for engineered structural tiedown and uplift restraint applications.
• UNC Class 2A thread specification - ensures compatibility with standard structural hardware, connectors, and bearing plates used in Strong-Rod systems and similar assemblies.
• Fully threaded along the entire 48 in. rod length - provides maximum flexibility for positioning couplers, nuts, and bearing hardware anywhere along the rod without cutting new threads.
• Uncoated black steel finish - suitable for interior structural applications and dry service conditions where a bare steel surface is appropriate.
• 5/8 in. rod diameter - sized to work within standard continuous rod tiedown system components and adhesive anchor applications calling for this common structural diameter.
• Made in the United States - manufactured domestically to meet quality and consistency expectations for structural building components.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind force resistance, this threaded rod delivers a continuous load path from roof to foundation - making it a purpose-built solution rather than a generic fastener.
• The precut 48 in. length eliminates field cutting for common tiedown rod installations, reducing labor time and material waste on residential and light commercial framing projects.
• With a Grade 55 rating meeting ASTM A36 standards (Fy = 55 ksi and Fu = 75 ksi), this rod is engineered to handle the demanding tensile loads present in shearwall overturning restraint and roof uplift restraint systems.
• The fully threaded design supports multiple use cases - from continuous rod tiedown systems to adhesive anchor rod applications - giving contractors and engineers a single versatile component across different structural details.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM5-4
• Product Class: Threaded Rod
• Rod Diameter: 5/8 in.
• Rod Length: 48 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Specification: ASTM A36; Fy = 55 ksi and 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 systems for shearwall overturning restraint
• Uplift restraint systems for roof applications
• Adhesive anchor rod installations
• Structural systems designed to resist seismic forces
• Structural systems designed to resist wind forces

Frequently Asked Questions

What is the difference between an all-thread rod and a standard partially threaded rod?

An all-thread rod - like the ATRM5-4 - is fully threaded along its entire length. This means nuts, couplers, and bearing plates can be positioned anywhere along the rod, providing maximum flexibility during installation in continuous tiedown and uplift restraint systems. A partially threaded rod only has threads at one or both ends.

Can this rod be used as an adhesive anchor rod?

Yes. In addition to its primary use in continuous rod tiedown systems for shearwall overturning restraint and roof uplift restraint, the ATRM5-4 is also suitable for use as an adhesive anchor rod, as stated in the product data.

What does the Grade 55 designation mean for this threaded rod?

Grade 55 refers to the minimum yield strength of the steel. The ATRM5-4 meets ASTM A36 specifications with a minimum yield strength (Fy) of 55 ksi and a minimum ultimate tensile strength (Fu) of 75 ksi, confirming it meets the load requirements for engineered structural tiedown applications.

Is this rod compatible with standard structural connectors and couplers?

The ATRM5-4 features a UNC Class 2A thread specification, which is a standard Unified National Coarse thread form used widely in structural hardware, ensuring compatibility with couplers, bearing plates, nuts, and other components called for in continuous rod system designs.