S-90602A257 5/8"-11 x 1 1/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged 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 provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized thread engagement with UNC coarse spacing and Class 2A fit for faster assembly and secure fastening
• Enhanced stability and distribution through the integrated flange design, reducing the need for separate washers
• Maximum torque transmission enabled by the external hex drive and 15/16" head width for secure installation
• Consistent quality assurance meeting SAE J429/IFI 111 specifications for industrial-grade reliability
• Robust material performance with Rockwell C32 hardness maintaining structural integrity under repeated loads

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides superior protection against corrosion in demanding environments including manufacturing equipment, structural assemblies, and machinery maintenance. The 5/8"-11 UNC coarse thread configuration ensures rapid installation while maintaining secure fastening, significantly reducing assembly time in production environments. The integrated flanged design eliminates washer requirements and provides superior load distribution, preventing surface damage and maintaining joint integrity under vibration and dynamic loads. These fully threaded fasteners offer complete engagement throughout the entire length, making them ideal for applications requiring maximum grip strength and pull-out resistance.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit tolerances with UNC coarse thread spacing (5/8"-11) and right-hand thread direction. Manufacturing complies with SAE J429 and IFI 111 specifications, ensuring consistent quality and performance. The fastener meets industry standards for Grade 8 strength classification with verified 150,000 psi tensile strength and Rockwell C32 hardness. The zinc yellow-chromate plating provides corrosion protection while maintaining compliance with industrial fastener requirements for heavy-duty applications.