S-90393A123 3/8"-16 x 1 1/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load distribution with an integrated flange that eliminates the need for a separate washer, reducing assembly time and improving joint integrity.
• Superior tensile strength of 120,000 PSI ensures reliable performance in high-stress applications, minimizing the risk of fastener failure.
• Excellent durability from Rockwell C22 hardness, providing resistance to wear and deformation under heavy-duty use.
• Secure locking capability with serrations on the flange that prevent loosening from vibration, maintaining clamp load in dynamic environments.
• Wide compatibility due to UNC coarse thread and Class 2A fit, enabling easy installation and interchangeability in standard industrial assemblies.
• Time-saving installation with an external hex drive and fully threaded design, allowing for quick fastening and consistent engagement.
• Regulatory compliance with SAE J429, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industrial, automotive, and construction applications. The flanged design distributes clamping force over a wider area, reducing surface pressure and preventing damage to assembled materials, which is essential for vibration-prone environments. Made with UNC coarse threads and Class 2A fit, it ensures rapid assembly and reliable performance in high-stress fastening scenarios, such as machinery frames, vehicle components, and structural assemblies. The serrated locking feature enhances security by resisting rotational loosening, while the fully threaded body provides consistent grip length for uniform load-bearing capacity. Ideal for B2B procurement, this screw delivers engineering value through its combination of high tensile strength, material hardness, and regulatory compliance, making it a dependable choice for demanding projects.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse thread standards. It meets IFI 111 specifications under SAE J429 for grade verification, ensuring mechanical properties like tensile strength and hardness are rigorously tested. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental and safety standards in industrial use.