S-92316A579 5/16"-18 x 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Grade 8 black-phosphate steel construction, providing superior corrosion resistance and longevity in harsh environments
• Maximum load-bearing capacity with 150,000 psi tensile strength and Rockwell C32 hardness, ensuring reliable performance under extreme stress
• Secure fastening through UNC coarse threading with Class 2A fit, offering excellent grip and vibration resistance in heavy machinery
• Easy installation and removal with external hex drive and flanged design, reducing assembly time and preventing surface damage
• Versatile compatibility with standard 1/2" length and 5/16"-18 thread size, fitting most industrial equipment and structural applications
• Regulatory compliance meeting SAE J429, RoHS 3, and REACH standards, ensuring safety and environmental responsibility
• Full-threaded design providing consistent clamping force along the entire length for uniform stress distribution

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 steel surface treatment creates a protective barrier against corrosion, significantly extending service life in manufacturing plants, construction sites, and automotive assemblies. The UNC coarse thread pattern with Class 2A fit ensures rapid installation and superior vibration resistance, preventing loosening in high-stress environments. Combined with the flanged design that distributes load pressure evenly, these fully threaded screws provide reliable fastening solutions for machinery frames, structural steel connections, and equipment maintenance where 150,000 psi tensile strength is essential for operational safety and longevity.

Specification Summary & Compliance

This 5/16"-18 hex head screw maintains precise Class 2A thread fit with UNC coarse spacing (18 TPI) and right-hand threading. Manufacturing complies with SAE J429 specifications for Grade 8 fasteners, ensuring consistent dimensional accuracy and mechanical properties. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming environmental safety and restricted substance adherence. The fastener meets IFI 111 requirements where applicable to SAE J429, guaranteeing industry-standard performance for professional applications.