The Simpson Strong-Tie ATRM 1-1/4 in. x 24 in. All-Thread Rod, Grade 55 is a fully threaded structural steel rod engineered to serve as a tension transfer element within systems designed to resist seismic and wind forces. Built from uncoated black steel meeting ASTM A36 material standards, this all-thread rod delivers a continuous and reliable load path from roof to foundation - making it a trusted choice for contractors and structural engineers working on shearwall overturning restraint, uplift restraint systems for roofs, and adhesive anchor rod applications. Precut to a convenient 24-inch length and threaded its entire length, the rod integrates directly into continuous rod tiedown systems without modification, saving time on the jobsite.

Key Features

• Precut 24 in. length - arrives ready to install with no cutting required, reducing labor time and material waste on the jobsite.
• Grade 55 specification - meets the strength demands of structural seismic and wind-force-resisting systems, providing engineered confidence in high-load applications.
• UNC Class 2A thread specification - ensures compatibility with standard threaded connectors, couplers, and hardware used in continuous rod tiedown and uplift restraint systems.
• ASTM A36; Fy = 55 ksi and Fu = 75 ksi - verified minimum yield and tensile strength values give designers precise data for load path calculations and structural design.
• Uncoated black steel finish - provides a clean, consistent surface for use in interior structural assemblies where coating is not required by the design.
• 1-1/4 in. rod diameter - a robust cross-section suited for heavy-duty tension transfer in shearwall and roof uplift restraint applications.
• Fully threaded along entire length - allows couplers, plates, and anchor hardware to be positioned anywhere along the rod, maximizing installation flexibility.

Why This Product

• Designed specifically as a tension transfer element for seismic and wind-force-resisting structural systems, this rod is purpose-built for the demanding performance requirements of continuous rod tiedown systems - not a generic fastener pressed into structural service.
• The Grade 55 rating backed by ASTM A36 material standards gives structural engineers documented yield and tensile values to work with, simplifying design compliance and plan review.
• Full threading from end to end means coupler placement is not restricted to a single location - the rod adapts to varying story heights and framing conditions without requiring custom-length orders.
• Versatility across multiple structural applications - including shearwall overturning restraint, roof uplift restraint, and adhesive anchor rod use - means this single rod can address several connection details on the same project.

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM10-2
• Rod Diameter: 1-1/4 in.
• Rod Length: 24 in.
• Grade: Grade 55
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36; Fy = 55 ksi and Fu = 75 ksi
• Material: Uncoated Steel
• Finish: Uncoated Steel
• Color: Black
• Product Class: Threaded Rod
• 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 applications
• Structural systems designed to resist seismic and wind forces

Frequently Asked Questions

What is this all-thread rod used for in structural construction?

The ATRM10-2 is designed as a tension transfer element for structural systems built to resist seismic and wind forces. It is used within continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and can also serve as an adhesive anchor rod in a variety of other structural applications.

What material and strength standards does this threaded rod meet?

This rod meets Grade 55 specifications and is made from ASTM A36 steel with a minimum yield strength of 55 ksi (Fy) and a minimum tensile strength of 75 ksi (Fu). The thread is manufactured to UNC Class 2A specification, ensuring compatibility with standard structural hardware and couplers.

Is this rod fully threaded along its entire length?

Yes. The ATRM is a fully threaded rod - also referred to as an all-thread rod - meaning threads run the complete length of the 24 in. rod. This allows couplers, bearing plates, and other hardware to be positioned at any point along the rod during installation.

Does this rod have any special coating or corrosion protection?

No. The ATRM10-2 is made from uncoated black steel with no applied coating or finish. It is intended for use in interior structural assemblies or applications where the design does not require corrosion protection.