The Simpson Strong-Tie ATRM 3/8 in. x 12 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 to deliver 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 versatility also makes it well suited for use as an adhesive anchor rod in a wide range of construction scenarios.

Key Features

• Precut to 12 in. length - ready to install right out of the box, saving time on the job site without the need for field cutting.
• Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - delivers the tensile and yield strength required for demanding structural applications including seismic and wind load resistance.
• UNC Class 2A thread specification - ensures reliable thread engagement with compatible nuts, couplers, and tiedown hardware for a secure, load-bearing connection.
• 3/8 in. rod diameter - sized appropriately for use in continuous rod tiedown assemblies and adhesive anchor applications where a compact, strong fastener is needed.
• Uncoated black steel finish - suitable for interior and protected structural applications where corrosion is not a primary environmental concern.
• Manufactured in the United States - produced domestically to consistent quality standards expected in engineered structural applications.

Why This Product

• Engineered specifically for seismic and wind force resistance, this threaded rod provides the structural continuity needed when a reliable load path from roof to foundation is required in a shearwall overturning restraint system.
• The precut 12 in. length eliminates field measuring and cutting, reducing installation time and the risk of errors when integrating the rod into a continuous rod tiedown or uplift restraint assembly.
• Grade 55 tensile strength (Fu = 75 ksi) means this rod can handle the high tension demands placed on a tiedown system during extreme wind or seismic events, giving engineers and installers confidence in the connection's capacity.
• The UNC Class 2A threading allows straightforward compatibility with standard structural nuts and coupling hardware, making this rod a practical choice for both tiedown systems and adhesive anchor rod applications.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM3-1
• Rod Diameter: 3/8 in.
• Rod Length: 12 in.
• Thread Specification: UNC Class 2A
• Grade: Grade 55
• Material Standard: ASTM A36; Fy = 55 ksi & 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 forces
• Structural systems designed to resist wind forces

Frequently Asked Questions

What thread specification does the ATRM3-1 all-thread rod use?

The ATRM3-1 uses a UNC Class 2A thread specification, which provides reliable compatibility with standard structural nuts, couplers, and tiedown hardware used in continuous rod tiedown and uplift restraint assemblies.

What are the strength ratings of this threaded rod?

This rod meets ASTM A36 Grade 55 specifications with a yield strength of Fy = 55 ksi and an ultimate tensile strength of Fu = 75 ksi, making it appropriate for structural applications involving seismic and wind force resistance.

Can this rod be used as an adhesive anchor rod?

Yes. In addition to its use in continuous rod tiedown systems for shearwall overturning restraint and uplift restraint systems for roofs, the ATRM all-thread rod is also suitable for use as an adhesive anchor rod in a variety of structural applications.

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

The ATRM3-1 comes precut to a 12 in. length, eliminating the need for field measuring or cutting and allowing for faster, more accurate installation in tiedown and anchor rod applications.