The Simpson Strong-Tie ATRM 7/8 in. x 36 in. All-Thread Rod, Grade 55 is a fully threaded structural 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 standards, this all-thread rod delivers a continuous and reliable load path from roof to foundation - making it a critical component in continuous rod tiedown systems for shearwall overturning restraint and uplift restraint systems for roofs. Its fully threaded design also makes it suitable for use as an adhesive anchor rod, giving engineers and contractors added flexibility across a range of structural applications.

Key Features

• Precut to 36 in. length - ready to install straight out of the box, saving layout and cutting time on the job site
• Grade 55 specification (Fy = 55 ksi, Fu = 75 ksi) - meets the elevated yield and tensile strength demands of structural tiedown and uplift restraint applications
• ASTM A36 material standard - ensures consistent, code-recognized mechanical properties that engineers and inspectors can rely on
• UNC Class 2A thread specification - provides a standard and widely compatible thread form that mates correctly with nuts, couplers, and other Strong-Rod system components
• Uncoated black steel finish - a straightforward, no-frills material choice suited for interior or protected structural assemblies where coating is not required
• 7/8 in. rod diameter - sized to handle the high tensile loads typical of shearwall overturning restraint and roof uplift systems in seismic and high-wind zones
• Fully threaded along entire length - enables precise positioning of bearing hardware, couplers, and take-up devices anywhere along the rod without the limitations of partial threading

Why This Product

• Engineered for seismic and wind load paths - designed specifically as a tension transfer element within structural systems that must resist lateral and uplift forces, giving builders a rod with a defined structural purpose rather than a generic fastener
• Dual-application versatility - works in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roofs, reducing the number of different rod products a contractor needs to stock for a wood-frame project
• Also suitable as an adhesive anchor rod - the fully threaded profile and ASTM A36 material make it compatible with adhesive anchor applications, expanding its usefulness beyond above-grade tiedown assemblies
• Made in the United States - domestic production supports consistent quality and availability for structural projects that require traceable, code-compliant materials

Specifications

• Brand: Simpson Strong-Tie
• MPN: ATRM7-3
• Rod Diameter: 7/8 in.
• Rod Length: 36 in.
• Thread Specification: UNC Class 2A
• Material Standard: ASTM A36
• Yield Strength (Fy): 55 ksi
• Ultimate Tensile Strength (Fu): 75 ksi
• Grade: Grade 55
• 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 structural systems is this all-thread rod designed for?

The ATRM7-3 is designed for use as a tension transfer element in structural systems engineered to resist seismic and wind forces. It is used in continuous rod tiedown systems for shearwall overturning restraint and in uplift restraint systems for roofs. It can also be used as an adhesive anchor rod in other applications.

What are the thread specifications for this rod?

The rod uses a UNC Class 2A thread specification, which is a standard unified coarse thread form compatible with nuts, couplers, and other hardware used in Strong-Rod systems and general structural assemblies.

What do Grade 55 and the ASTM A36 designation mean for this rod?

Grade 55 refers to the rod meeting a minimum yield strength (Fy) of 55 ksi and an ultimate tensile strength (Fu) of 75 ksi per ASTM A36 standards. These values define the rod's structural load capacity and ensure it meets the requirements of engineered shearwall tiedown and uplift restraint designs.

Is the rod fully threaded along its entire length?

Yes. This is an all-thread rod, meaning it is fully threaded from end to end. The fully threaded profile allows bearing hardware, take-up devices, and couplers to be positioned at any point along the rod, which is important for flexible installation within continuous rod tiedown assemblies.