S-91247A609 5/16"-18 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in various environmental conditions
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced durability from Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Easy installation and removal with external hex drive design, compatible with standard tools for efficient maintenance
• Versatile partial threading allowing precise clamping force distribution across the 7" length
• Proven reliability meeting Grade 5 standards for consistent performance in industrial applications

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures exceptional resistance to shear forces and deformation in construction, machinery assembly, and structural frameworks. The 5/16"-18 UNC coarse thread configuration provides superior grip in various materials, while the partial threading design allows for precise tension control across the 7" length. The zinc plated finish offers reliable corrosion protection in demanding environments, making these external hex drive screws ideal for applications requiring both structural integrity and maintenance accessibility. Engineered to withstand vibration and dynamic loads, these fasteners solve critical challenges in equipment manufacturing and industrial assembly where reliability and durability are paramount.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit with 5/16"-18 UNC coarse thread specifications and right-hand thread direction. Manufactured to exacting standards including ASME B18.2.1 and SAE J429 Grade 5 requirements. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. The fastener maintains dimensional accuracy with 1/2" head width and 13/64" head height for consistent performance in standardized applications.