The Simpson Strong-Tie ATRM 3/8 in. x 36 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 from uncoated black steel meeting ASTM A36 specifications with a minimum yield strength of 55 ksi and a minimum tensile strength of 75 ksi, this all-thread rod provides a continuous and reliable load path from roof to foundation - making it an essential component in shearwall overturning restraint and roof uplift restraint applications. Beyond tiedown systems, it is also suitable for use as an adhesive anchor rod and a variety of other structural fastening applications.

Key Features

• Precut 36 in. length - ready to install without on-site cutting, saving labor time and reducing measurement error
• Meets Grade 55 specifications (Fy = 55 ksi, Fu = 75 ksi) - delivers verified tensile and yield strength for demanding seismic and wind-force applications
• UNC Class 2A thread specification - ensures compatibility with standard nuts and connectors used in continuous rod tiedown systems
• ASTM A36 material standard - confirms the rod meets a widely recognized structural steel specification, supporting code-compliant installations
• Uncoated black steel finish - suited for interior structural applications and adhesive anchor rod use where coating is not required
• 3/8 in. rod diameter - sized for use in continuous rod tiedown systems, shearwall overturning restraint, and uplift restraint systems for roofs
• Fully threaded along the entire 36 in. length - allows positioning of nuts and connectors anywhere along the rod for flexible installation configurations

Why This Product

• Designed specifically as a tension transfer element for seismic and wind force resistance, this all-thread rod is engineered to anchor structural systems from roof to foundation - not a generic fastener adapted for structural use.
• The precut 36 in. length eliminates field cutting, making it a time-efficient choice for contractors installing continuous rod tiedown or uplift restraint systems.
• Grade 55 strength (Fy = 55 ksi, Fu = 75 ksi) combined with UNC Class 2A threading means this rod integrates directly with compatible Strong-Rod system hardware without modification.
• Its versatility extends beyond tiedown systems - the same rod can serve as an adhesive anchor rod or be used across a variety of other structural fastening applications, reducing the number of different rod SKUs needed on a job site.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM3-3
• Product Class: Threaded Rod
• Rod Diameter: 3/8 in.
• Rod Length: 36 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Tensile Strength (Fu): 75 ksi
• Grade: Grade 55
• 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
• Structural systems designed to resist seismic forces
• Structural systems designed to resist wind forces

Frequently Asked Questions

What is this all-thread rod used for?

This fully threaded rod is designed as a tension transfer element for structural systems built to resist seismic and wind forces. It is used in continuous rod tiedown systems for shearwall overturning restraint, in uplift restraint systems for roofs, and also as an adhesive anchor rod in a variety of other structural applications.

What thread standard does this rod use?

The ATRM3-3 features a UNC Class 2A thread specification, which ensures compatibility with standard nuts and connectors used in continuous rod tiedown and uplift restraint system assemblies.

What are the strength ratings for this rod?

This rod 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 - providing the structural capacity required for seismic and wind-force load path applications.

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

The ATRM3-3 comes precut at 36 in. (3 ft.) for convenience, eliminating the need for field cutting and allowing for faster installation in tiedown and uplift restraint system assemblies.