S-94705A791 1"-8 x 3 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 under extreme loads, reducing the risk of fastener failure in critical applications.
• High hardness rating (Rockwell C35) provides superior resistance to wear and deformation, extending service life in abrasive environments.
• Class 2A thread fit with coarse UNC threading allows for easier, faster assembly while maintaining secure connections in high-vibration settings.
• Partially threaded design offers optimal grip length control, preventing joint loosening and improving structural stability in industrial assemblies.
• External hex drive with large 1 5/8" head enables high-torque installation using standard tools, speeding up maintenance and installation processes.
• ASTM A193 Grade B7 compliance guarantees material quality and manufacturing consistency for pressure systems and high-temperature applications.
• Robust steel construction delivers excellent corrosion resistance and durability in demanding construction and industrial environments.

Professional Applications & Engineering Value

This 1"-8 UNC Grade B7 steel hex head screw is engineered to address critical challenges in heavy-duty industrial and construction applications. The partially threaded design with precise 1" grip length ensures optimal clamping force distribution, preventing stress concentration points that can lead to joint failure. The coarse UNC thread profile maintains secure fastening even in high-vibration environments common in machinery, structural steel connections, and pressure vessel assemblies. Manufactured from ASTM A193 Grade B7 steel, this external hex drive fastener delivers consistent performance in elevated temperature applications while meeting rigorous industrial standards. The combination of 125,000 psi tensile strength and Rockwell C35 hardness provides exceptional resistance to mechanical stresses, making it ideal for critical bolting applications where reliability cannot be compromised.

Specification Summary & Compliance

This hex head screw features Class 2A thread fit tolerance for reliable assembly with standard nuts, 1"-8 UNC coarse thread specifications for optimal engagement, and partial threading with 2 1/4" thread length. The fastener complies with ASTM A193 specifications for high-temperature service and meets ASTM Grade B7 material requirements, ensuring consistent mechanical properties including the specified 125,000 psi tensile strength and Rockwell C35 hardness. Manufacturing follows standardized dimensions with precise head width (1 5/8") and overall length (3 1/4") for compatibility with industry-standard tools and applications.