The Simpson Strong-Tie ATRM 1 in. x 24 in. All-Thread Rod, Grade 55 is a fully threaded steel rod engineered to serve as a tension transfer element in structural systems designed to resist seismic and wind forces. Built from uncoated black steel to ASTM A36 material standards, this precut rod provides a continuous and reliable load path from roof to foundation - making it a trusted component in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roofs. It is also well-suited for use as an adhesive anchor rod and a variety of other structural anchoring applications.

Key Features

• Precut to 24 in. length - arrives ready to install with no cutting required, saving time and labor on the job site.
• Meets Grade 55 specifications - delivers the tensile and yield strength needed for demanding seismic and wind-force applications in structural systems.
• ASTM A36 material; Fy = 55 ksi and Fu = 75 ksi - independently verified steel properties ensure predictable, code-compliant structural performance.
• UNC Class 2A thread specification - provides a standardized thread form that ensures reliable fitment with compatible nuts, couplers, and tiedown hardware.
• Uncoated black steel finish - a clean, bare-steel surface compatible with adhesive anchor systems and a wide range of structural connection methods.
• 1 in. diameter rod - sized for high-load tension transfer applications including shearwall overturning restraint and roof uplift restraint systems.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind-force resistance, this all-thread rod supports a continuous load path from roof to foundation - addressing one of the most critical requirements in shearwall and uplift restraint system design.
• The precut 24 in. length eliminates field cutting and reduces installation time, giving contractors a job-site-ready component that maintains consistent dimensional accuracy.
• With Grade 55 strength and ASTM A36 material certification, this threaded rod meets the structural requirements for use in engineered continuous rod tiedown systems without the uncertainty of uncertified alternatives.
• The UNC Class 2A thread specification ensures compatibility with standard tiedown hardware and couplers, reducing the risk of mismatched fasteners and simplifying procurement.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM8-2
• Rod Diameter: 1 in.
• Rod Length: 24 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• ASTM Standard: ASTM A36; Fy = 55 ksi and 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 roof applications
• Adhesive anchor rod applications
• Structural systems designed to resist seismic and wind forces

Frequently Asked Questions

What structural applications is this all-thread rod designed for?

This fully threaded rod is designed for use as a tension transfer element in structural systems that resist seismic and wind forces. It can be used in continuous rod tiedown systems for shearwall overturning restraint, in uplift restraint systems for roofs, and as an adhesive anchor rod in other structural applications.

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

This rod is manufactured from uncoated black steel to ASTM A36 material standards, with a minimum yield strength of Fy = 55 ksi and a minimum tensile strength of Fu = 75 ksi, meeting Grade 55 specifications. The thread form is UNC Class 2A.

Is this rod precut, or does it need to be cut to length in the field?

This rod comes precut to a 24 in. length with a 1 in. diameter, so no field cutting is required. It arrives ready for installation, helping to reduce labor time and ensure dimensional consistency.

Does this threaded rod have any coating or surface treatment applied?

No. This rod features an uncoated black steel finish with no additional coating or surface treatment. The bare steel surface is compatible with adhesive anchor systems and a range of structural connection methods.