S-92316A595 5/16"-18 x 2 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through black-phosphate steel coating, extending service life in demanding industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced stability and distribution from the integrated flange design, reducing the need for separate washers
• Robust mechanical properties with Rockwell C32 hardness providing excellent wear resistance and durability
• Efficient installation and removal via external hex drive design, compatible with standard wrenching tools
• Versatile partial threading allowing precise clamp load control across various material thicknesses

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The black-phosphate coating provides essential corrosion protection in manufacturing environments exposed to moisture and chemicals, while the flanged design eliminates washer requirements and distributes clamping force more effectively. With 150,000 psi tensile strength and Rockwell C32 hardness, these partially threaded fasteners maintain integrity under extreme vibration and dynamic loads common in machinery, construction equipment, and automotive assemblies. The UNC coarse thread configuration ensures rapid installation and superior holding power in both metallic and composite materials.

Specification Summary & Compliance

This 5/16"-18 x 2-1/2" hex head screw features Class 2A thread fit tolerance for precise engagement and meets IFI 111/SAE J429 specifications for dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Manufacturing follows strict quality controls for thread diameter (0.3125"), thread spacing (coarse), and minimum thread length (7/8") to guarantee consistent performance in critical applications.