S-92620A661 3/8"-24 x 3 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 capability with 150,000 psi tensile strength and Grade 8 classification for demanding industrial applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Precise thread engagement with UNF fine threading and Class 2A fit ensuring vibration resistance and secure fastening
• Enhanced durability from Rockwell C33 hardness that maintains structural integrity under heavy stress
• Full-length threading provides consistent clamping force across the entire 3½" length for maximum holding power
• Standard-compliant performance meeting ASME B18.2.1 and SAE J429 specifications for reliable interoperability
• Easy installation and removal with external hex drive design allowing high torque application with standard tools

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value through its high-strength steel construction and zinc yellow-chromate plating, specifically engineered to address critical fastening challenges in heavy-duty applications. The 3/8"-24 UNF fine thread configuration provides superior resistance to vibration loosening while maintaining precise thread engagement in materials prone to stripping. The fully threaded design ensures uniform stress distribution across the entire length, preventing point loading failures in structural assemblies. These industrial screws are particularly valuable in automotive, construction, and manufacturing environments where 150,000 psi tensile strength and reliable performance under extreme conditions are mandatory requirements. The combination of external hex drive and Class 2A thread fit enables efficient installation while maintaining the precision necessary for critical connections.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 3/8"-24 UNF fine threading and right-hand thread direction. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. The fastener maintains Rockwell C33 hardness and 150,000 psi tensile strength consistent with Grade 8 requirements. The zinc yellow-chromate plating provides corrosion resistance while the external hex drive and 9/16" head width facilitate standard tool compatibility.