S-92316A778 1/2"-20 x 5" 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 the most demanding heavy-duty applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-phosphate steel coating extends the screw's service life in harsh industrial environments, minimizing maintenance needs.
• Precise fastening and vibration resistance are achieved with the UNF fine thread and Class 2A fit, providing secure, long-lasting connections.
• High-grade material strength with a Rockwell C32 hardness and Grade 8 classification guarantees durability under high-stress conditions.
• Enhanced stability and load distribution from the flanged design and external hex drive allows for easier installation and improved joint integrity.
• Compliance with industry standards including SAE J429, RoHS 3, and REACH ensures product reliability and environmental safety for professional use.
• Optimized for partial threading to provide strong grip where needed while allowing flexibility in assembly for various structural applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and corrosion resistance are paramount. The black-phosphate steel material, combined with a UNF fine thread and Class 2A fit, ensures precise torque application and resistance to loosening under vibration, common in dynamic industrial environments. Its partially threaded and flanged design enhances load distribution, reducing stress concentrations and preventing joint failure. Ideal for applications requiring SAE J429 compliance, this screw provides reliable fastening in equipment subjected to extreme forces, while meeting RoHS 3 and REACH standards for safe, sustainable use in global supply chains.

Specification Summary & Compliance

This screw features a 1/2"-20 UNF fine thread with Class 2A fit for precise dimensional accuracy, a 5" length, and a flange diameter of 1 5/64". It complies with IFI 111 (SAE J429) specifications for Grade 8 fasteners, ensuring consistent performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.