S-90602A264 5/8"-11 x 4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength and Rockwell C32 hardness for demanding industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Enhanced stability and load distribution through the integrated flange design, eliminating the need for separate washers
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring reliable fastening in various materials
• Easy installation and removal with standard 15/16" external hex head compatible with common wrench tools
• Verified quality assurance through compliance with SAE J429/IFI 111 specifications for consistent performance
• Strategic partial threading providing unthreaded shank strength where maximum clamping force is required

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in heavy-duty industrial applications where failure is not an option. The zinc yellow-chromate plated steel construction provides superior protection against corrosion in demanding environments, from manufacturing equipment to structural assemblies. The UNC coarse thread configuration ensures rapid installation and reliable holding power in various substrates, while the external hex drive accommodates high torque applications without stripping. The integrated flange design distributes clamping force evenly, preventing surface damage and maintaining joint integrity under extreme vibration and dynamic loads. These partially threaded fasteners are engineered specifically for applications requiring maximum strength in the unthreaded portion, making them ideal for machinery, construction, and transportation equipment where 150,000 psi tensile strength is critical for safety and performance.

Specification Summary & Compliance

This 5/8"-11 hex head screw features precise Class 2A thread fit tolerances with UNC coarse threading standards. The fastener meets SAE J429 specifications and IFI 111 standards for Grade 8 requirements, ensuring consistent quality and performance. Manufacturing complies with industry standards for dimensional accuracy, including the specified 4" length, 15/16" head width, and 1 21/64" flange diameter. The zinc yellow-chromate plating provides environmental protection while maintaining the mechanical properties required for heavy-duty industrial applications.