S-92620A324 1 1/4"-7 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 PSI and Rockwell C33 hardness, these screws withstand extreme stress and vibration, reducing the risk of fastener failure in critical applications.
• Superior Corrosion Protection: Zinc yellow-chromate plating offers excellent resistance to rust and environmental elements, extending service life in harsh industrial settings.
• Reliable Fastening Performance: UNC coarse threads provide quick installation and strong holding power, minimizing cross-threading and ensuring secure connections in heavy machinery.
• High-Strength Material Integrity: Manufactured from Grade 8 steel, these screws deliver consistent performance under high-torque conditions, ideal for structural and automotive assemblies.
• Precision Thread Fit: Class 2A thread tolerance ensures smooth engagement with nuts and tapped holes, reducing assembly time and improving fastener reliability.
• Optimized Drive Design: External hex head allows for easy wrench access and high torque application, facilitating efficient maintenance and disassembly.
• Regulatory Compliance Assurance: Meets ASME B18.2.1 and SAE J429 standards, along with RoHS 3 and REACH compliance, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery, and automotive sectors where high tensile strength and durability are paramount. The steel material combined with zinc yellow-chromate plating provides robust corrosion resistance, essential for outdoor or chemically exposed environments. The UNC coarse thread design ensures rapid installation and reliable performance in vibrating equipment, reducing maintenance downtime. With a partially threaded shank, it offers precise clamping force control, making it ideal for structural fastening and high-stress assemblies that demand consistent load distribution and long-term reliability.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and compatibility. It conforms to ASME B18.2.1 and SAE J429 specifications for mechanical properties and manufacturing consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and restricted substance control. Key dimensions include a 1 1/4"-7 UNC thread size, 3" length, and external hex drive for standardized tooling.