S-91247A343 7/16"-20 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with Grade 5 steel construction providing 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc plating that protects against rust and extends service life in harsh industrial environments
• Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
• Optimized torque transmission via external hex drive design that allows for high tightening forces with standard tools
• Versatile partial threading that combines strong grip in the threaded section with smooth shank for alignment in structural applications
• Consistent dimensional accuracy meeting ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
• Environmental compliance with RoHS 3 and REACH regulations ensuring safe use across various industries

Professional Applications & Engineering Value

This 7/16-20 UNF Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and partially threaded design. The combination of Rockwell C25 hardness and 120,000 psi tensile strength addresses critical challenges in heavy machinery, structural steel connections, and industrial equipment where vibration resistance and long-term reliability are paramount. The UNF fine threading provides superior clamping force distribution compared to coarse threads, while the external hex drive enables efficient installation in confined spaces. This 7-inch heavy-duty fastener is engineered to withstand dynamic loads and environmental exposure, making it ideal for construction, manufacturing, and automotive applications where failure is not an option.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 7/16-20 UNF fine threading and right-hand thread direction. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance consistency. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, demonstrating environmental responsibility while maintaining the mechanical properties necessary for industrial applications.