The Simpson Strong-Tie ATRM 3/8 in. x 24 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 deliver a continuous and reliable load path from roof to foundation, this all-thread rod is a core 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 suitable for use as an adhesive anchor rod, giving contractors and engineers a versatile fastening solution across multiple structural applications.

Key Features

• Precut 24 in. length - ready to install straight out of the package, saving time on the jobsite and eliminating the need for on-site cutting or threading.
• Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - meets established structural strength thresholds, giving engineers confidence in load calculations for seismic and wind resistance applications.
• UNC Class 2A thread specification - a standardized thread form that ensures proper fit and compatibility with standard nuts, couplers, and tiedown hardware used in continuous rod systems.
• Fully threaded (all-thread) construction - threads run the entire 24 in. length, allowing connection at any point along the rod and providing maximum flexibility during structural assembly.
• Uncoated black steel finish - suited for interior structural applications where the rod will be protected within wall assemblies, keeping material cost straightforward without unnecessary coating.
• 3/8 in. rod diameter - a commonly specified size for residential and light commercial tiedown systems, compatible with Simpson Strong-Tie tiedown hardware designed for this rod diameter.

Why This Product

• Designed specifically for continuous rod tiedown systems, this all-thread rod provides a proven, engineered solution for shearwall overturning restraint - a critical requirement in seismic and high-wind construction zones.
• The fully threaded 24 in. length means no field threading is required, reducing labor time and the risk of threading errors that can compromise load-path integrity.
• With Grade 55 strength ratings (Fy = 55 ksi, Fu = 75 ksi) backed by ASTM A36 compliance, structural engineers can use this rod with confidence in code-compliant designs for both seismic and wind uplift restraint.
• Versatility across applications - from shearwall tiedown systems to roof uplift restraint to adhesive anchor rod use - means this single rod size covers a wide range of structural connection needs on the same project.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM3-2
• Product Class: Threaded Rod
• Rod Diameter: 3/8 in.
• Rod Length: 24 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: 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 system for shearwall overturning restraint
• Uplift restraint system for roof applications
• Adhesive anchor rod applications
• Structural systems designed to resist seismic and wind forces

Frequently Asked Questions

What structural systems is the ATRM3-2 all-thread rod designed for?

The ATRM3-2 is designed for use as a tension transfer element in structural systems that resist seismic and wind forces. It is used in continuous rod tiedown systems for shearwall overturning restraint, in uplift restraint systems for roofs, and can also serve as an adhesive anchor rod in a variety of other applications.

Does this rod come precut or does it need to be cut to length on the jobsite?

The ATRM3-2 is precut to 24 in. for convenience. No field cutting or threading is required, making it ready for immediate use in tiedown and uplift restraint assemblies.

What are the material strength ratings for this all-thread rod?

The ATRM3-2 meets Grade 55 specifications and conforms to ASTM A36, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The thread form follows UNC Class 2A specifications.

Is this rod coated or treated for corrosion resistance?

No - the ATRM3-2 is made from uncoated black steel. It is intended for use in interior structural applications such as within wall assemblies where it will be protected from moisture and the elements.