S-92620A298 1 1/8"-7 x 4" 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 thread engagement with UNC coarse threading and Class 2A fit for faster assembly and reduced cross-threading risk
• Enhanced torque transmission via external hex drive design that prevents tool slippage during installation
• Controlled thread distribution through partially threaded design that concentrates strength where needed most
• Premium material integrity with Grade 8 steel and Rockwell C33 hardness maintaining dimensional stability under extreme conditions
• Simplified maintenance access with standard 1 11/16" head width accommodating common industrial tools

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 1 1/8"-7 UNC coarse threading with Class 2A fit ensures rapid installation in thick materials while minimizing thread stripping concerns. The zinc yellow-chromate plating provides a robust barrier against corrosion in manufacturing facilities, outdoor applications, and chemical exposure environments. With partial threading concentrating the fastener's strength at critical stress points, engineers achieve optimal clamp load distribution while reducing material costs. The external hex drive configuration allows for high-torque installation using standard industrial tools, making it ideal for maintenance operations and production line applications where reliability and quick assembly are paramount.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with 1 1/8"-7 UNC coarse thread specifications. This fastener complies with ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional consistency and mechanical performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, making it suitable for global industrial applications. With 4" length and 2 1/2" minimum thread length, it provides consistent engagement depth across various material thicknesses.