S-92316A591 5/16"-18 x 2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress environments
• Superior corrosion resistance provided by black-phosphate steel coating, extending service life in demanding industrial conditions
• Enhanced durability through Rockwell C32 hardness, maintaining structural integrity under repeated stress and vibration
• Secure fastening with flange design that distributes clamping force evenly and eliminates the need for separate washers
• Optimized thread engagement with UNC coarse threading and Class 2A fit for quick installation and vibration resistance
• Versatile partial threading allowing precise clamping control where full thread engagement isn't required
• Industry-standard compliance meeting IFI 111/SAE J429 specifications for guaranteed interchangeability and performance

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, construction equipment, and automotive assemblies where vibration resistance and structural integrity are paramount. The black-phosphate steel coating provides essential corrosion protection in harsh environments, while the flange design eliminates washer requirements and distributes load more effectively than standard hex heads. The UNC coarse thread configuration ensures rapid installation and maintains grip under dynamic loading conditions, making it ideal for industrial fastening applications requiring both speed of assembly and long-term reliability. The partial threading allows engineers to specify exact clamp zones without compromising the screw's tensile strength.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC 5/16"-18 coarse threading and partial threading up to 7/8" minimum. This fastener conforms to IFI 111/SAE J429 specifications for Grade 8 mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The external hex drive configuration provides secure tool engagement while the 11/16" flange diameter ensures optimal load distribution.