The Simpson Strong-Tie ATRM 7/8 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, uplift restraint systems for roofs, and a wide range of other applications including use as an adhesive anchor rod. Whether you're working on a new residential build or retrofitting an existing structure for seismic compliance, this precut threaded rod delivers the dimensional precision and mechanical strength structural projects demand.

Key Features

• Precut to 12 in. length - ready to install right out of the package, eliminating field cutting time and reducing jobsite waste
• Meets Grade 55 specifications - confirms the rod delivers the minimum yield and tensile strength required for structural load path applications
• UNC Class 2A thread specification - ensures compatibility with standard nuts and couplers used in continuous rod tiedown assemblies, reducing fit-up issues on the job
• ASTM A36 steel; Fy = 55 ksi and Fu = 75 ksi - the combination of yield and tensile strength values meets demanding structural requirements for seismic and wind force resistance
• Uncoated black steel finish - suitable for interior structural applications where exposure to corrosive environments is not a concern, and compatible with the full Simpson Strong-Tie anchor tiedown system
• 7/8 in. rod diameter - sized for high-load tension transfer applications, providing the cross-sectional strength needed in shearwall overturning and roof uplift restraint systems
• Fully threaded along the entire length - allows flexible positioning of couplers, nuts, and bearing plates anywhere along the rod without the constraint of a partially threaded design

Why This Product

• Engineered for seismic and wind force resistance - the ATRM is specifically designed as a tension transfer element to maintain a continuous load path from roof to foundation, making it appropriate for structural systems in high-wind and seismic zones
• Versatile across multiple structural applications - the same rod works in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and as an adhesive anchor rod, reducing the number of different products a contractor needs to stock
• Precut for convenience - at 12 in. in length, this rod arrives ready to use, saving time during installation and keeping projects on schedule
• Made in the United States - domestically produced to ASTM A36 standards with verified Grade 55 mechanical properties, supporting confidence in material traceability for structural documentation

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM7-1
• Product Class: Threaded Rod
• Rod Diameter: 7/8 in.
• Rod Length: 12 in.
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi and Fu = 75 ksi
• Grade: Grade 55
• 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 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 ATRM7-1 use, and why does it matter?

The ATRM7-1 uses a UNC Class 2A thread specification. This is a standard Unified National Coarse thread form with Class 2A tolerances, which ensures reliable compatibility with the nuts, couplers, and other threaded hardware commonly used in continuous rod tiedown and uplift restraint assemblies. Consistent thread fit reduces installation complications and supports proper load transfer across threaded connections.

What are the yield and tensile strength values for this threaded rod?

The ATRM7-1 is manufactured to ASTM A36 standards and meets Grade 55 specifications, with a minimum yield strength (Fy) of 55 ksi and a minimum ultimate tensile strength (Fu) of 75 ksi. These values confirm the rod's capacity to carry the tension loads required in seismic and wind force-resisting structural systems.

Can this all-thread rod be used as an adhesive anchor rod?

Yes. In addition to its primary use in continuous rod tiedown systems for shearwall overturning restraint and uplift restraint systems for roofs, the ATRM7-1 can also be used as an adhesive anchor rod. The fully threaded design along its entire 12 in. length supports proper adhesive engagement and mechanical interlock when used in anchor applications.

Is the ATRM7-1 suitable for exterior or corrosive environments?

The ATRM7-1 is made from uncoated black steel with no protective coating applied. It is best suited for interior structural applications where exposure to moisture, chemicals, or corrosive conditions is not anticipated. For applications in corrosive environments, a coated or stainless steel threaded rod product should be evaluated instead.