The Simpson Strong-Tie ATRM6-3 ATRM 3/4 in. x 36 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 provide a continuous and reliable load path from roof to foundation, this threaded rod is a core component in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod applications. Crafted from uncoated black steel and meeting Grade 55 specifications, it delivers the strength and consistency demanded by structural and seismic design professionals.

Key Features

• Precut to 36 in. length - arrives ready to install with no field cutting required, saving labor time and reducing setup waste on the jobsite.
• Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - provides verified tensile and yield strength values that structural engineers can rely on for load path calculations in seismic and wind-resistant designs.
• UNC Class 2A thread specification - ensures compatibility with standard threaded hardware and connectors used in continuous rod tiedown and uplift restraint systems.
• 3/4 in. rod diameter - a heavy-duty size suited for high-load structural applications including shearwall overturning restraint and roof uplift restraint.
• Uncoated black steel construction - offers the raw steel surface often required for adhesive anchor rod installations and structural interior applications.
• Fully threaded along the entire 36 in. length - allows fastening and adjustment at any point along the rod, maximizing flexibility in continuous load path system configurations.

Why This Product

• Engineered for seismic and wind-force resistance - the ATRM6-3 is specifically designed as a tension transfer element, making it the right choice for structural systems that must meet code requirements for continuous load path from roof to foundation.
• Versatile across multiple structural applications - a single rod type handles shearwall overturning restraint, roof uplift restraint, and adhesive anchor rod use, reducing the need to source separate products for different system configurations.
• Precut and ready to use - the 36 in. precut length eliminates field fabrication steps, helping contractors maintain schedule efficiency on structural framing and tiedown installations.
• Backed by Simpson Strong-Tie engineering - produced by Simpson Strong-Tie, a recognized name in structural connectors, giving engineers and inspectors confidence in material traceability and specification compliance.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM6-3
• Product Class: Threaded Rod
• Rod Diameter: 3/4 in.
• Rod Length: 36 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi & 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 system for shearwall overturning restraint
• Uplift restraint system for roofs
• Adhesive anchor rod applications
• Structural systems designed to resist seismic forces
• Structural systems designed to resist wind forces

Frequently Asked Questions

What structural systems is the ATRM6-3 designed to be used in?

The ATRM6-3 is designed for use in structural systems that resist seismic and wind forces. It functions as a tension transfer element providing a continuous load path from roof to foundation, and can be used in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and as an adhesive anchor rod.

What are the material strength specifications for this threaded rod?

The ATRM6-3 meets ASTM A36 Grade 55 specifications with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The thread conforms to UNC Class 2A specification for compatibility with standard structural hardware.

Does the ATRM6-3 come precut or does it need to be cut to length in the field?

The ATRM6-3 comes precut to 36 in. (3 ft.) in length, so no field cutting is required. It is fully threaded along its entire length, allowing fastening at any point along the rod for flexible installation configurations.

Is this threaded rod suitable for use as an adhesive anchor rod?

Yes. In addition to its use in continuous rod tiedown and roof uplift restraint systems, the ATRM6-3 can also be used as an adhesive anchor rod. Its uncoated black steel surface and full UNC Class 2A threading make it compatible with adhesive anchor applications.