S-94705A836 1 1/4"-8 x 4 1/2" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 125,000 PSI tensile strength for reliable performance in high-stress applications
• Superior material durability through ASTM Grade B7 steel construction with Rockwell C35 hardness for extended service life
• Optimized thread engagement with UN fine thread pattern and Class 2A fit ensuring precise, vibration-resistant connections
• Enhanced installation efficiency with external hex drive and 2" head width for superior torque application
• Strategic load distribution through partially threaded design with 1¾" grip length for improved clamping force
• Industry-standard compliance meeting ASTM A193 specifications for consistent quality and reliability
• Versatile inch-system compatibility with right-hand threading for seamless integration into existing industrial assemblies

Professional Applications & Engineering Value

This high-strength hex head screw addresses critical engineering challenges in demanding industrial environments where vibration resistance and structural integrity are paramount. The ASTM Grade B7 steel construction, combined with Rockwell C35 hardness, provides exceptional resistance to deformation under extreme loads, making it ideal for pressure vessel applications, structural steel connections, and heavy machinery assemblies. The partially threaded design with precise 2¾" thread length and 1¾" grip length ensures optimal stress distribution while preventing thread damage during installation. The UN fine thread pattern with Class 2A fit maintains secure fastening in high-vibration environments, while the external hex drive and substantial 2" head width facilitate efficient installation with standard tools, reducing assembly time and labor costs in industrial maintenance and construction projects.

Specification Summary & Compliance

This 1¼"-8 hex head screw features Class 2A thread fit tolerance per UN standards, ensuring precise dimensional accuracy for reliable mating with corresponding nuts. The fastener complies with ASTM A193 specifications for high-temperature service and meets ASTM Grade B7 material requirements, providing assurance of consistent mechanical properties and performance characteristics. Manufacturing follows established industrial standards for inch-system fasteners, with right-hand threading and partial threading configuration as specified. The product maintains compliance with relevant industry regulations for heavy-duty industrial applications where material traceability and performance verification are essential.