S-90409A176 5/8"-11 x 2 1/4" 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.
• Grade 8 steel construction with Rockwell C32 hardness provides superior durability and resistance to wear, extending service life in demanding environments.
• Flanged hex head design eliminates the need for a separate washer, offering easier installation and improved load distribution.
• UNC coarse threading with Class 2A fit allows for quick assembly and secure fastening, minimizing cross-threading issues.
• Full threading along the 2 1/4" length ensures maximum grip and adjustability in various material thicknesses.
• Compliance with SAE J429 and IFI 111 standards guarantees consistent quality and interchangeability for industrial applications.
• RoHS 3 and REACH compliant materials support environmental regulations and safe usage in global markets.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive assemblies where vibration and high loads are common. The steel material and Rockwell C32 hardness provide excellent fatigue resistance, preventing loosening under dynamic stresses. Its flanged design simplifies installation by integrating a washer function, reducing part count and assembly time. The UNC coarse thread ensures rapid engagement in coarse-grained materials, while the external hex drive offers high torque capability for secure tightening. Ideal for structural frames, equipment mounts, and other high-strength fastening needs, this screw delivers reliability where failure is not an option.

Specification Summary & Compliance

This 5/8"-11 hex head screw features precise Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. Manufactured to meet IFI 111 / SAE J429 specifications for Grade 8 fasteners, it guarantees dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the use of safe, environmentally responsible materials without restricted substances.