S-92316A597 5/16"-18 x 3" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-phosphate steel coating extends service life in harsh industrial environments.
• Flanged design eliminates the need for a separate washer, providing even load distribution and simplified installation.
• Grade 8 classification guarantees high hardness (Rockwell C32) and durability for demanding mechanical assemblies.
• Coarse UNC threading offers quick assembly and strong holding power, ideal for vibration-prone settings.
• Class 2A thread fit ensures consistent, easy engagement with nuts and tapped holes, speeding up production.
• Compliance with IFI 111/SAE J429, RoHS 3, and REACH assures quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industries, such as construction, automotive, and machinery manufacturing. The black-phosphate steel material provides a robust barrier against rust and corrosion, essential for outdoor or humid conditions. With a partially threaded and flanged design, it delivers secure clamping force without slippage, while the external hex drive allows for high-torque installation using standard tools. The coarse UNC thread resists loosening under vibration, making it ideal for equipment that undergoes dynamic loads. By meeting IFI 111/SAE J429 standards, it ensures interoperability and reliability, reducing downtime and maintenance costs in professional applications.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threading with a size of 5/16"-18. It complies with IFI 111 SAE J429 for mechanical properties, and meets environmental regulations such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances. The specifications cover a length of 3", flange diameter of 11/16", and partial threading with a minimum thread length of 7/8", providing reliable performance in accordance with industrial norms.