S-90409A178 5/8"-11 x 2 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress industrial applications.
• Superior corrosion resistance and durability from Grade 8 steel construction and Rockwell C32 hardness, extending service life.
• Secure and stable fastening due to the integrated flange, which distributes pressure and eliminates the need for separate washers.
• Easy installation and removal with an external hex drive and 15/16" head width, compatible with standard tools.
• Optimized thread engagement with 5/8"-11 UNC coarse threading and Class 2A fit, ensuring quick assembly and vibration resistance.
• Versatile partial threading on a 2 3/4" length allows for precise clamping force control in varied material thicknesses.
• Compliance with rigorous industry standards including SAE J429 and IFI 111, guaranteeing consistent quality and safety.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The steel material and Rockwell C32 hardness provide excellent resistance to wear and environmental stressors, reducing maintenance needs. Its coarse UNC thread and partial threading design facilitate faster installation in tough materials, while the flange enhances joint stability by increasing the bearing surface. Ideal for securing structural components, this externally driven hex screw ensures reliable performance in demanding industrial applications, backed by compliance with SAE J429 and environmental regulations.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threading (5/8"-11) per inch specifications. It meets IFI 111 SAE J429 for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances. The manufacturing process follows strict guidelines to deliver a partially threaded, flanged screw with verified tensile strength and hardness, suitable for regulated industrial use.