The Simpson Strong-Tie ATRM 1 in. x 18 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 precut all-thread rod is a core component in anchor tiedown systems for shearwall overturning restraint and in uplift restraint systems for roof applications. Its versatility also makes it a dependable choice for use as an adhesive anchor rod in a wide range of construction and structural retrofit projects.

Key Features

• Precut 18 in. length - arrives ready to install without field cutting, saving time on the job site and reducing material waste.
• Grade 55 specification (Fy = 55 ksi, Fu = 75 ksi) - delivers medium-strength tensile and yield performance suited to demanding structural load transfer applications including seismic and wind resistance systems.
• ASTM A36 material standard - ensures consistent, code-recognized steel quality that engineers and inspectors can confidently specify and verify.
• UNC Class 2A thread specification - provides a standardized thread fit compatible with nuts, couplers, and hardware used throughout continuous rod tiedown systems, simplifying assembly.
• 1 in. rod diameter - sized to handle significant structural loads in shearwall overturning restraint and roof uplift applications without oversizing the connection.
• Uncoated black steel finish - suited for protected interior structural applications where corrosion exposure is limited, keeping the rod ready for immediate use without additional surface prep.
• Fully threaded along entire length - allows flexible placement and adjustment of nuts, couplers, and bearing hardware anywhere along the rod, maximizing installation versatility.

Why This Product

• Engineered for continuous load path systems - the ATRM is purpose-built for Strong-Rod systems that carry seismic and wind forces from roof to foundation, making it a reliable choice when a complete, engineer-designed tiedown solution is required.
• Dual-application flexibility - functions equally well in shearwall overturning restraint systems and roof uplift restraint systems, reducing the number of different rod SKUs needed on a complex structural project.
• Also suitable as an adhesive anchor rod - the fully threaded profile and medium-strength Grade 55 specification make this rod appropriate for anchoring into concrete or masonry with structural adhesive, broadening its use on mixed-trade job sites.
• Made in the United States to ASTM A36 standards - provides domestically produced, code-recognized structural steel that supports project documentation and specification compliance for commercial and residential construction alike.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM8-1.5
• Rod Diameter: 1 in.
• Rod Length: 18 in.
• Product Class: Threaded Rod
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Steel Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Ultimate Strength (Fu): 75 ksi
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

• Continuous rod tiedown system for shearwall overturning restraint
• Uplift restraint system 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 thread specification does the ATRM8-1.5 use?

The ATRM8-1.5 uses a UNC Class 2A thread specification. This is a standardized thread fit that ensures compatibility with nuts, couplers, and other hardware components used throughout continuous rod tiedown and uplift restraint systems.

Can this all-thread rod be used as an adhesive anchor rod?

Yes. In addition to its primary role as a tension transfer element in shearwall overturning restraint and roof uplift restraint systems, the ATRM can be used as an adhesive anchor rod for a variety of structural anchoring applications.

What does Grade 55 mean for this threaded rod?

Grade 55 refers to the rod meeting an ASTM A36 steel specification with a minimum yield strength (Fy) of 55 ksi and an ultimate tensile strength (Fu) of 75 ksi. This medium-strength rating makes it appropriate for demanding structural load transfer applications such as seismic and wind force resistance systems.

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

The ATRM8-1.5 comes precut to 18 in. for convenience, so no field cutting is required. The fully threaded profile runs the entire length, allowing flexible positioning of nuts, couplers, and bearing hardware anywhere along the rod during installation.