S-94705A828 1 1/8"-8 x 8" 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 applications, reducing failure risks
• ASTM Grade B7 steel construction provides superior durability and resistance to deformation under heavy loads
• Rockwell C35 hardness offers excellent wear resistance for extended service life in demanding environments
• Class 2A thread fit enables precise, smooth installation with standard tools while maintaining secure fastening
• Partially threaded design with 5 1/4" grip length provides optimal clamping force distribution across joined materials
• External hex drive with 1 13/16" head width allows for high-torque installation using common industrial tools
• UN fine threads (1 1/8"-8) deliver superior vibration resistance and improved load distribution compared to coarse threads

Professional Applications & Engineering Value

This ASTM Grade B7 steel hex head screw is engineered to solve critical fastening challenges in heavy-duty industrial applications where reliability is paramount. The combination of 125,000 psi tensile strength and Rockwell C35 hardness makes it ideal for pressure vessels, structural connections, and machinery subjected to extreme mechanical stress and temperature variations. The UN fine thread configuration provides enhanced resistance to vibration loosening, while the partially threaded design ensures optimal clamping force is maintained across the 5 1/4" grip length. With its external hex drive and precise Class 2A thread fit, installation is streamlined using standard industrial tools, reducing assembly time while delivering consistent, reliable performance in critical applications where fastener failure is not an option.

Specification Summary & Compliance

This 1 1/8"-8 hex head screw features Class 2A thread fit per UN standards, ensuring dimensional accuracy and interchangeability. Manufactured to ASTM A193 specifications for high-temperature service, the fastener complies with industry standards for ASTM Grade B7 material requirements. The inch system measurement provides compatibility with North American industrial specifications, while the partially threaded design and fine thread spacing deliver precision performance in demanding engineering applications where compliance with established mechanical standards is essential for safety and reliability.