The Simpson Strong-Tie ATRM 5/8 in. x 36 in. All-Thread Rod, Grade 55 is a fully threaded steel rod engineered by Simpson Strong-Tie to serve as a tension transfer element in structural systems designed to resist seismic and wind forces. By providing 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 and in uplift restraint systems for roof applications. Its fully threaded design also makes it suitable for use as an adhesive anchor rod, giving structural engineers and contractors a versatile fastening solution across a range of demanding applications.

Key Features

• Precut 36 in. length - arrives ready to install, eliminating on-site cutting and saving time during structural assembly
• Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - meets the minimum yield and tensile strength requirements for use in engineered structural tiedown systems, giving confidence in load-path integrity
• UNC Class 2A thread specification - ensures compatibility with standard nuts and couplers used throughout continuous rod tiedown and uplift restraint systems
• Fully threaded design (all-thread rod) - allows attachment points at any position along the rod, providing maximum flexibility for shearwall overturning restraint and roof uplift applications
• Uncoated black steel construction - a durable, straightforward material choice suited for interior structural applications where the rod is protected within the building assembly
• 5/8 in. rod diameter - sized to work within Simpson Strong-Tie Strong-Rod Systems components for continuous load-path assemblies from roof to foundation

Why This Product

• Engineered for continuous load-path systems - this all-thread rod is specifically designed as a tension transfer element, making it a purpose-built solution for resisting seismic and wind forces rather than a generic fastener
• Dual-application versatility - a single rod model can serve both shearwall overturning restraint and roof uplift restraint roles, reducing the number of separate components a contractor needs to keep on hand
• Meets Grade 55 and ASTM A36 standards - the verified yield strength of 55 ksi and tensile strength of 75 ksi provide the documented strength values that structural engineers need to specify this rod with confidence in permitted construction
• Adhesive anchor rod compatibility - the fully threaded profile and standard UNC Class 2A threads allow this rod to double as an adhesive anchor rod, broadening its usefulness across concrete and structural attachment scenarios

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM5-3
• Rod Diameter: 5/8 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
• Product Class: Threaded Rod
• System: Strong-Rod Systems
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

• Continuous rod tiedown system (ATS) for shearwall overturning restraint
• Uplift restraint system (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 structural systems is the Simpson Strong-Tie ATRM5-3 designed to work with?

The ATRM5-3 is designed for use within Simpson Strong-Tie Strong-Rod Systems. It functions as a tension transfer element in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roofs, providing a continuous and reliable load path from roof to foundation to resist seismic and wind forces. It can also be used as an adhesive anchor rod.

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

The ATRM5-3 is manufactured from uncoated black steel meeting ASTM A36 requirements and is rated to Grade 55 specifications, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The threads conform to UNC Class 2A specifications for compatibility with standard structural hardware.

Does this rod arrive precut, or does it need to be cut to length in the field?

The ATRM5-3 arrives precut at 36 in. (3 feet) in length with a diameter of 5/8 in., so no field cutting is required. This precut convenience allows for faster and more straightforward installation within tiedown and uplift restraint assemblies.

Is this all-thread rod suitable for exterior or corrosive environments?

The ATRM5-3 features an uncoated steel finish with no protective coating applied. This makes it most appropriate for interior structural applications where the rod is protected within the building assembly, rather than direct-exposure exterior or corrosive environments.