S-91257A684 7/16"-14 x 3 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity - Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in the most demanding heavy-duty applications
• Superior Corrosion Protection - Zinc Yellow-Chromate plating provides enhanced resistance to rust and environmental degradation
• Optimized Thread Engagement - UNC coarse thread design with Class 2A fit guarantees secure fastening and easier installation in various materials
• Exceptional Durability - Rockwell C33 hardness rating maintains structural integrity under repeated stress and vibration
• Industry-Standard Compatibility - External hex drive and standard dimensions ensure seamless integration with existing tools and equipment
• Strategic Threading Design - Partial threading provides unthreaded shank strength where needed while maintaining full thread engagement
• Regulatory Compliance Assurance - Meets multiple industry standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The 7/16"-14 UNC coarse thread configuration provides superior grip in steel frameworks, machinery assembly, and structural components, while the zinc yellow-chromate plating offers reliable corrosion resistance in challenging environments. The partially threaded design maximizes unthreaded shank strength, making these fasteners ideal for applications requiring precise clamp load distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, these screws maintain integrity under extreme vibration and dynamic loading conditions common in construction equipment, automotive systems, and industrial machinery.

Specification Summary & Compliance

This 3 3/4" length hex head screw features precise Class 2A thread fit tolerance with 7/16"-14 UNC coarse threading and external hex drive configuration. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance of material safety and regulatory adherence for global industrial applications.