S-92620A281 1 1/4"-12 x 7 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc yellow-chromate plating that extends service life in harsh environments
• Optimized torque transmission with external hex drive design for secure installation and removal
• Precise thread engagement with Class 2A thread fit ensuring consistent fastening performance
• Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
• Versatile partial threading with 3" minimum thread length for flexible application across various material thicknesses
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and reliability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value for demanding industrial applications where failure is not an option. The 1-1/4"-12 UNF fine thread configuration provides superior vibration resistance compared to coarse threads, making it ideal for machinery, heavy equipment, and structural assemblies subject to dynamic loads. The zinc yellow-chromate plating creates a robust barrier against corrosion, significantly extending service life in outdoor or chemically aggressive environments. With partial threading and substantial 7-1/2" length, this fastener accommodates varying material thicknesses while maintaining optimal clamp load distribution. The external hex drive design ensures maximum torque application during installation, preventing stripping and ensuring secure fastening in critical joints where reliability is paramount.

Specification Summary & Compliance

This high-strength hex head screw features precise Class 2A thread fit according to UNF standards, ensuring consistent engagement and reliable performance. Manufactured to meet ASME B18.2.1 and SAE J429 specifications, it guarantees dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener exceeds industry requirements for heavy-duty applications where structural integrity is critical.