S-92316A317 5/16"-18 x 3 1/2" 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 head design eliminates the need for separate washers, speeding up assembly and providing a larger bearing surface.
• Partially threaded shank allows for precise clamping force on specific joint sections, improving vibration resistance.
• Class 2A thread fit with UNC coarse spacing ensures easy, fast installation and consistent engagement in various materials.
• External hex drive offers high torque capability for secure tightening with common tools, minimizing slippage.
• Grade 8 compliance guarantees consistent mechanical properties, meeting rigorous SAE J429 standards for heavy-duty use.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws provide a robust fastening solution where vibration resistance and structural integrity are critical. The black phosphate steel construction offers enhanced corrosion protection, making them ideal for outdoor machinery, automotive assemblies, and construction equipment. The partially threaded UNC coarse thread design ensures rapid installation and secure clamping in metals and composites, reducing assembly time while maintaining high tensile strength. With their flanged head, they distribute load evenly, preventing surface damage and simplifying inventory by combining screw and washer functions. These screws are trusted in applications requiring SAE J429 compliance, from heavy equipment manufacturing to infrastructure projects, delivering long-term reliability under extreme conditions.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It meets IFI 111 specifications under SAE J429 for Grade 8 fasteners, ensuring consistent hardness (Rockwell C32) and tensile strength. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety, free from hazardous substances, suitable for global industrial supply chains.