S-92316A313 5/16"-18 x 5/8" 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 black-phosphate steel coating, extending service life in harsh environments
• Maximum holding power through fully threaded UNC coarse pattern design for secure fastening in various materials
• Enhanced installation efficiency with external hex drive and flanged design for quick assembly and increased bearing surface
• Consistent thread engagement ensured by Class 2A thread fit for precise, reliable connections
• High durability backed by Rockwell C32 hardness for excellent wear resistance and repeated use capability
• Industry compliance assurance meeting SAE J429 specifications for quality and performance standards

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws deliver exceptional performance where vibration resistance and structural integrity are critical. The black-phosphate steel coating provides superior corrosion protection, making these fasteners ideal for automotive assemblies, heavy machinery, construction equipment, and manufacturing applications exposed to moisture and harsh conditions. The UNC coarse thread pattern ensures rapid installation and superior pull-out resistance in both soft and hard materials, while the external hex drive and flanged design distribute clamping force evenly, preventing loosening under dynamic loads. These high-strength screws solve common engineering challenges by maintaining clamp load integrity in high-vibration environments and providing reliable fastening solutions for critical structural connections.

Specification Summary & Compliance

This 5/16"-18 hex head screw features precise Class 2A thread fit tolerance for consistent engagement and meets SAE J429 specifications for Grade 8 fasteners. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications. Manufacturing follows IFI 111 standards where applicable to SAE J429 requirements, guaranteeing dimensional accuracy and performance reliability for professional users.