S-92620A118 5/16"-32 x 1 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
• Superior Corrosion Protection through zinc yellow-chromate plating that withstands harsh industrial environments
• Precision Thread Engagement with UNEF extra fine threading and Class 2A fit for vibration-resistant connections
• Enhanced Durability from Rockwell C33 hardness that maintains fastener integrity under repeated stress
• Optimized Torque Transmission via external hex drive design for secure installation with standard tools
• Reliable Performance Compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
• Versatile Partial Threading allowing both clamping and alignment functions in assembly applications

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where vibration resistance and structural integrity are paramount. The UNEF extra fine threading provides significantly more thread engagement per inch compared to standard threads, creating superior resistance to loosening in high-vibration machinery, automotive assemblies, and precision equipment. The zinc yellow-chromate plating offers enhanced corrosion protection that extends service life in exposed or humid conditions, while the Rockwell C33 hardness ensures the fastener maintains its mechanical properties under sustained loading. The combination of 150,000 psi tensile strength and precise Class 2A thread fit makes this fastener ideal for critical connections in heavy equipment, structural frameworks, and manufacturing systems where failure is not an option.

Specification Summary & Compliance

This 5/16"-32 hex head screw features precise Class 2A thread fit tolerances with UNEF extra fine threading (32 threads per inch) and partial threading configuration. Manufactured to meet ASME B18.2.1 dimensional specifications and SAE J429 Grade 8 mechanical requirements, ensuring consistent performance and interchangeability. The fastener maintains compliance with industry standards for dimensional accuracy, mechanical properties, and quality assurance protocols suitable for professional industrial applications.