The Simpson Strong-Tie ATRM 7/8 in. x 18 in. All-Thread Rod, Grade 55 is a fully threaded tension transfer element engineered by Simpson Strong-Tie for use in structural systems designed to resist seismic and wind forces. This precut all-thread rod provides a continuous and reliable load path from roof to foundation, making it a proven choice for continuous rod tiedown systems used in shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod applications. Built from uncoated black steel to ASTM A36 standards with a yield strength of 55 ksi, this medium-strength threaded rod delivers dependable structural performance in demanding load-path assemblies.

Key Features

• Precut at 18 in. length - ready to install without additional cutting, reducing labor time on the job site and minimizing measurement error in critical structural connections.
• Grade 55 specification (ASTM A36; Fy = 55 ksi and Fu = 75 ksi) - delivers medium-strength steel performance that meets the structural demands of seismic and wind-force tiedown systems.
• UNC Class 2A thread specification - ensures compatibility with standard nuts, couplers, and bearing plates used in continuous rod tiedown assemblies, simplifying sourcing and installation.
• 7/8 in. rod diameter - provides the cross-sectional area needed for high-tension transfer applications in shearwall overturning restraint and roof uplift systems.
• Uncoated black steel finish - suitable for interior structural applications where a bare steel surface is acceptable, keeping material costs efficient for concealed installations.
• Fully threaded along the entire length - allows flexible positioning of hardware anywhere along the rod, accommodating varied connection configurations without constraints on thread engagement location.
• Made in the United States - produced domestically to consistent quality standards for use in code-compliant structural systems.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind-force resistance, this all-thread rod is a purpose-built component for continuous load-path systems - not a generic fastener adapted to the task.
• The precut 18 in. length eliminates field cutting of threaded rod, saving installation time and ensuring thread integrity is maintained from end to end without the risk of damaged threads from cutting tools.
• With full UNC Class 2A threading and Grade 55 steel, this rod integrates directly into Simpson Strong-Tie anchor tiedown systems (ATS) and uplift restraint systems (URS), streamlining specification and compatibility verification.
• Its versatility extends beyond tiedown systems - the ATRM can also serve as an adhesive anchor rod, giving contractors a single stocked component that covers multiple structural connection scenarios.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM7-1.5
• Rod Diameter: 7/8 in.
• Rod Length: 18 in.
• Product Class: Threaded Rod
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Ultimate Strength (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 systems for shearwall overturning restraint
• Uplift restraint systems (URS) 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 grade of steel is the ATRM7-1.5 all-thread rod, and what does that mean structurally?

The ATRM7-1.5 meets Grade 55 specifications per ASTM A36, with a minimum yield strength (Fy) of 55 ksi and a minimum ultimate tensile strength (Fu) of 75 ksi. This medium-strength rating makes it appropriate for tension transfer applications in seismic and wind-force resistant structural systems, including shearwall overturning restraint and roof uplift restraint.

Can this threaded rod be used as an adhesive anchor rod?

Yes. In addition to its use in continuous rod tiedown systems and roof uplift restraint systems, the ATRM is designed to be compatible with adhesive anchor rod applications, making it a versatile component for various structural connection needs.

What does the UNC Class 2A thread specification mean for compatibility?

UNC Class 2A is a standard external thread classification for Unified National Coarse threads. This means the ATRM7-1.5 is compatible with standard nuts, couplers, bearing plates, and other hardware that use UNC Class 2B internal threads - the typical mating specification used throughout continuous rod tiedown and structural anchor systems.

Is this rod fully threaded, and why does that matter for installation?

Yes, the ATRM is a fully threaded rod (all-thread rod), meaning threads run the entire 18 in. length. Full threading allows hardware such as nuts and couplers to be positioned anywhere along the rod without being limited to a specific threaded zone, providing greater flexibility when fitting components within a structural assembly.