S-90409A197 5/8"-18 x 5" 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, ideal for high-stress industrial assemblies.
• Superior corrosion resistance and durability from Grade 8 steel construction and Rockwell C32 hardness.
• Secure, vibration-resistant fastening thanks to the integrated flange and UNF fine thread design.
• Easy installation and removal with a standard 15/16" external hex head for common tool compatibility.
• Precise thread engagement ensured by Class 2A thread fit, reducing cross-threading risks.
• Reliable performance in regulated environments with full compliance to RoHS 3 and REACH standards.
• Versatile partial threading allows for adjustable clamping force in varied material thicknesses.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where joint integrity under dynamic loads is paramount. The 5/8"-18 UNF fine thread and partially threaded shank provide enhanced fatigue resistance and precise tension control, minimizing loosening in vibrating environments. The flanged design distributes clamping force evenly, reducing surface damage and the need for separate washers. Manufactured from high-strength steel and compliant with SAE J429, it ensures consistent performance in demanding applications such as engine mounts, structural frames, and industrial equipment, delivering long-term reliability and reduced maintenance cycles.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances and UNF fine thread standards, with manufacturing specifications meeting IFI 111/SAE J429. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability in industrial use.