The Simpson Strong-Tie ATRM 3/4 in. x 18 in. All-Thread Rod (Grade 55) is a fully threaded structural rod engineered as a tension transfer element within systems designed to resist seismic and wind forces. Built from uncoated black steel meeting ASTM A36 material standards with a minimum yield strength of 55 ksi, this precut all-thread rod delivers a continuous and reliable load path from roof to foundation - making it a trusted choice for shearwall overturning restraint and roof uplift restraint applications. Its UNC Class 2A thread specification ensures compatibility across a wide range of structural connectors, and its versatility extends to use as an adhesive anchor rod in various construction scenarios.

Key Features

• Precut 18 in. length - arrives job-ready with no field cutting required, saving installation time and reducing waste on the jobsite.
• Grade 55 specification (Fy = 55 ksi, Fu = 75 ksi) - provides verified medium-strength performance with clearly defined yield and ultimate tensile values for use in engineered structural designs.
• UNC Class 2A thread specification - ensures consistent thread fit and compatibility with standard structural hardware, nuts, and couplers used in tiedown and anchor systems.
• ASTM A36 uncoated black steel construction - meets a widely recognized structural steel standard, giving engineers and contractors confidence in material traceability and performance.
• 3/4 in. rod diameter - sized for high-load structural applications including continuous rod tiedown systems and uplift restraint assemblies where robust tension capacity is required.
• Fully threaded along entire length - allows flexible placement and adjustment within a tiedown or anchor rod assembly, eliminating limitations tied to partial-thread rods.
• Made in the United States - domestically produced for consistent quality standards and reliable supply for structural construction projects.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind force resistance, this rod is built for the demands of continuous rod tiedown systems (ATS) - not just general-purpose fastening.
• The precut 18 in. format means contractors can install directly from the package without measuring or cutting, reducing labor time when installing multiple rods in a shearwall or roof uplift restraint system.
• With ASTM A36 material certification and Grade 55 strength ratings, structural engineers can specify this rod with confidence, knowing the mechanical properties are standardized and verifiable for code-compliant designs.
• The fully threaded profile across the entire 18 in. length offers maximum flexibility in positioning couplers, nuts, and bearing plates - making this rod adaptable to adhesive anchor rod applications as well as structural tiedown assemblies.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM6-1.5
• Rod Diameter: 3/4 in.
• Rod Length: 18 in.
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Ultimate Tensile Strength (Fu): 75 ksi
• Product Class: Threaded Rod
• Quantity: 1
• Country of Origin: United States
• Prop 65: No

Approved Applications

• Continuous rod tiedown systems (ATS) 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 structural applications is the ATRM6-1.5 all-thread rod designed for?

This rod is designed as a tension transfer element for use in structural systems that resist seismic and wind forces. Primary applications include continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod installations.

What does Grade 55 mean for this threaded rod?

Grade 55 indicates the rod meets ASTM A36 material standards with a minimum yield strength (Fy) of 55 ksi and an ultimate tensile strength (Fu) of 75 ksi. These defined mechanical properties allow structural engineers to accurately calculate load capacity and specify the rod with confidence in engineered designs.

Is this rod fully threaded along its entire length?

Yes - the ATRM6-1.5 is a fully threaded rod (all-thread rod) along the complete 18 in. length. This allows nuts, couplers, and bearing plates to be positioned anywhere along the rod, providing flexibility during installation in tiedown and anchor rod assemblies.

What thread specification does the ATRM6-1.5 use, and why does it matter?

The rod uses a UNC Class 2A thread specification. This is a standard unified national coarse thread classification that ensures proper fit and compatibility with corresponding nuts, couplers, and structural connectors commonly used in shearwall tiedown and uplift restraint systems.