S-91247A681 7/16"-14 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating protects against rust and environmental damage, extending service life in demanding conditions.
• Heavy-duty Grade 5 classification with Rockwell C25 hardness provides excellent durability and resistance to wear and deformation.
• Coarse UNC threads offer faster installation and better grip in a wide range of materials, improving assembly efficiency.
• Partially threaded design allows for precise clamping force control, preventing joint loosening under vibration.
• Class 2A thread fit ensures consistent, easy assembly with standard nuts while maintaining secure connections.
• External hex drive enables high-torque installation with common tools, reducing installation time and labor costs.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 5 hex head screws deliver critical performance where vibration resistance and structural integrity are paramount. The zinc plated steel construction provides essential corrosion protection for outdoor equipment, machinery frames, and structural assemblies exposed to harsh environments. The 7/16"-14 UNC coarse threading ensures rapid installation in steel, aluminum, and cast iron components while maintaining superior pull-out resistance. With partial threading optimizing clamp load distribution, these fasteners prevent joint failure in vibrating systems like agricultural machinery, construction equipment, and transportation infrastructure. The combination of 120,000 psi tensile strength and Rockwell C25 hardness makes these industrial hex bolts ideal for critical connections requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

These 3" hex head screws feature precise Class 2A thread fit tolerances and UNC thread form per industry standards. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.