The Simpson Strong-Tie ATRM9-1 All-Thread Rod is a fully threaded 1-1/8 in. diameter by 12 in. long tension transfer element engineered for use in structural systems designed to resist seismic and wind forces. Made from uncoated black steel meeting Grade 55 specifications, this precut threaded rod delivers a continuous and reliable load path from roof to foundation - making it a go-to choice for shearwall overturning restraint in continuous rod tiedown systems and uplift restraint applications for roofs. It is equally suited for use as an adhesive anchor rod in a wide range of other structural applications.

Key Features

• Precut to 12 in. length - ships ready to install, eliminating field cutting and saving time on the job site.
• Grade 55 specification (ASTM A36; Fy = 55 ksi and Fu = 75 ksi) - delivers the verified tensile and yield strength required for engineered structural load path applications in seismic and wind force-resisting systems.
• UNC Class 2A thread specification - ensures precise, code-compliant thread fit with compatible nuts, couplers, and tiedown hardware used in continuous rod systems.
• 1-1/8 in. rod diameter - provides the cross-sectional capacity needed for heavy-duty shearwall overturning restraint and roof uplift restraint systems.
• Uncoated black steel finish - suited for interior structural applications where the rod is encapsulated within wall assemblies or used with adhesive anchoring systems.
• Versatile application range - functions as a shearwall tiedown rod, a roof uplift restraint element, or an adhesive anchor rod, giving contractors flexibility across multiple structural system types.

Why This Product

• Engineered for seismic and wind load path continuity - the ATRM all-thread rod is specifically designed as a tension transfer element, meaning it is built to handle the dynamic forces that shearwall and roof uplift systems must resist during seismic events and high-wind conditions.
• Meets recognized material standards - Grade 55 compliance and ASTM A36 material properties give engineers and inspectors the documented proof of performance needed for permitted structural work.
• Precut convenience reduces field labor - the 12 in. precut length means no additional cutting equipment or time is needed on site, supporting faster installation in continuous rod tiedown systems.
• Multi-application utility - a single rod design that works in anchor tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod applications reduces the need to stock multiple specialty fasteners.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM9-1
• Rod Diameter: 1-1/8 in.
• Rod Length: 12 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi and Fu = 75 ksi
• Grade: Grade 55
• Product Class: Threaded Rod
• 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 Simpson Strong-Tie ATRM all-thread rod designed for?

The ATRM is a tension transfer element for use in structural systems designed to resist seismic and wind forces. It provides a continuous and reliable load path from roof to foundation. Specific applications include continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod installations.

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

The ATRM9-1 is manufactured from uncoated black steel meeting ASTM A36 material requirements. It is rated at Fy = 55 ksi (yield strength) and Fu = 75 ksi (tensile strength), conforming to Grade 55 specifications. The thread form is UNC Class 2A.

Is this rod precut, or does it need to be cut to length on site?

This rod is precut to 12 in. for convenience. No field cutting is required, which helps streamline installation in continuous rod tiedown and uplift restraint systems.

Does the uncoated finish affect where this rod can be used?

The ATRM9-1 features an uncoated black steel finish. It is intended for structural applications such as those found within wall assemblies in shearwall tiedown systems or in adhesive anchor rod installations. The uncoated finish is consistent with its design as a load path element in interior or encapsulated structural configurations.