S-92316A830 5/8"-18 x 3" 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 thanks to black-phosphate steel coating that protects against rust and degradation
• Precise thread engagement with UNF fine spacing and Class 2A thread fit for secure, vibration-resistant connections
• Enhanced installation efficiency through external hex drive design that allows for high-torque application with standard tools
• Optimized weight distribution with integrated flange that eliminates the need for separate washers
• Reduced material stress through partially threaded design that concentrates strength where needed most
• Long-term reliability backed by Rockwell C32 hardness for maintained performance under repeated loading

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws deliver critical performance where failure is not an option. The black-phosphate steel construction provides essential corrosion protection in manufacturing facilities, outdoor equipment, and automotive applications where exposure to moisture and chemicals is common. The UNF fine thread configuration ensures superior vibration resistance in machinery, structural assemblies, and heavy equipment that experience constant dynamic loads. With partial threading and integrated flange, these fasteners eliminate stress concentration points while providing distributed bearing surface, making them ideal for critical joints in construction, transportation, and industrial machinery where both strength and precision are paramount.

Specification Summary & Compliance

This 5/8"-18 UNF hex head screw features precise Class 2A thread fit per UNF standards with fine thread spacing for optimal engagement. Manufactured to meet IFI 111 specifications where identified as SAE J429 Grade 8, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, including the latest SVHC requirements as of June 14, 2023, making it suitable for global industrial applications with strict environmental and safety requirements.