S-94705A839 1 1/4"-8 x 5 1/4" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional tensile strength of 125,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• High hardness rating of Rockwell C35 provides superior resistance to wear and deformation, extending service life in demanding environments.
• Partially threaded design with a 2 3/4" thread length and 2 1/2" grip length offers optimal clamping force and vibration resistance for secure connections.
• Class 2A thread fit and UN fine thread profile ensure precise, easy assembly and consistent performance in machinery and structural applications.
• ASTM A193 Grade B7 compliance guarantees material integrity and performance standards for high-temperature and high-pressure uses.
• External hex drive and 2" head width allow for straightforward installation and high torque application with standard tools, saving time and labor.
• Heavy-duty steel construction delivers durability and corrosion resistance, ideal for long-term use in harsh industrial settings.

Professional Applications & Engineering Value

This Grade B7 steel hex head screw is engineered to address critical challenges in heavy machinery, pressure vessels, and structural assemblies where high tensile strength and thermal stability are paramount. The partially threaded configuration with a UN fine thread enhances grip and distributes stress evenly, minimizing loosening under vibration. Made from ASTM A193-compliant steel and featuring a Rockwell C35 hardness, it resists deformation and wear in corrosive or high-temperature environments. The external hex drive and precise Class 2A thread fit streamline installation, reducing downtime in industrial maintenance and construction projects. Ideal for applications requiring reliable heavy-duty fasteners, it ensures safety and efficiency in pipelines, valves, and equipment frames.

Specification Summary & Compliance

This hex head screw adheres to Class 2A thread fit tolerances and UN fine thread standards for consistent engagement. It meets ASTM A193 specifications for material composition and performance, with a tensile strength of 125,000 psi and hardness of Rockwell C35. The product complies with industry regulations for heavy-duty industrial fasteners, ensuring reliability in applications requiring high mechanical strength and durability.