Product Description
The Simpson Strong-Tie ATRM 3/4 in. x 48 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. 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. It can also serve as an adhesive anchor rod, making it a versatile choice for a wide range of structural fastening and anchoring needs.
Key Features
- Precut 48 in. length - arrives ready to install, eliminating the need for field cutting and saving time on the job site.
- Grade 55 specification (ASTM A36; Fy = 55 ksi, Fu = 75 ksi) - delivers proven tensile and yield strength required for engineered shearwall and uplift restraint applications.
- UNC Class 2A thread specification - ensures compatibility with standard nuts, couplers, and bearing plates used in continuous rod tiedown systems.
- 3/4 in. rod diameter - sized for high-load structural tiedown applications where robust tension transfer is required from roof to foundation.
- Uncoated black steel finish - suited for interior structural installations where exposure to moisture or corrosive environments is not a factor.
- Fully threaded along entire length - allows connection hardware to be positioned anywhere along the rod, giving installers flexible placement options for tiedown assemblies.
Why This Product
- Designed specifically as a tension transfer element for seismic and wind-force-resistant structures, this threaded rod provides the continuous load path from roof to foundation that engineered tiedown systems demand.
- With a precut 48 in. length and full UNC Class 2A threading, the rod installs directly into continuous rod tiedown systems and uplift restraint systems without additional preparation.
- The Grade 55 rating (Fy = 55 ksi, Fu = 75 ksi) meets the strength requirements for shearwall overturning restraint applications, giving engineers and contractors confidence in the structural performance.
- Its versatility extends beyond tiedown systems - the ATRM can also function as an adhesive anchor rod, making it useful across multiple structural anchoring applications on the same project.
Specifications
- Brand: Simpson Strong-Tie
- MPN: ATRM6-4
- Rod Diameter: 3/4 in.
- Rod Length: 48 in.
- Thread Specification: UNC Class 2A
- Grade: Grade 55
- Material Standard: ASTM A36; Fy = 55 ksi & 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 roof applications
- Adhesive anchor rod installations
- Structural systems designed to resist seismic forces
- Structural systems designed to resist wind forces
Frequently Asked Questions
- What structural systems is the ATRM6-4 all-thread rod designed for?
- The ATRM6-4 is designed as a tension transfer element for structural systems that resist seismic and wind forces. It is used in continuous rod tiedown systems for shearwall overturning restraint, uplift restraint systems for roofs, and can also be used as an adhesive anchor rod in other applications.
- What are the material strength properties of this threaded rod?
- The ATRM6-4 meets Grade 55 specifications per ASTM A36, with a minimum yield strength (Fy) of 55 ksi and a minimum tensile strength (Fu) of 75 ksi. The thread specification is UNC Class 2A.
- Is this rod precut or does it need to be cut to length on site?
- The ATRM6-4 comes precut to a 3/4 in. diameter by 48 in. length, so no field cutting is required. The fully threaded design allows hardware to be positioned anywhere along the rod during installation.
- Does the uncoated finish affect where this rod can be used?
- The ATRM6-4 features an uncoated black steel finish with no protective coating applied. It is best suited for interior structural installations where direct exposure to moisture or corrosive conditions is not expected.
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