S-90409A194 5/8"-18 x 3 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 steel construction and 150,000 psi tensile strength, ensuring reliable performance in high-stress industrial environments.
• Superior corrosion resistance and material integrity due to Rockwell C32 hardness, providing long-lasting service life and reduced maintenance needs.
• Secure and precise fastening with UNF fine threading and Class 2A thread fit, offering excellent vibration resistance and minimized loosening.
• Enhanced load distribution and stability from the integrated flange design, eliminating the need for a separate washer and speeding up assembly.
• Easy installation and removal using a standard external hex drive, compatible with common tools for efficient maintenance and adjustments.
• Compliance with stringent industry standards including IFI 111/SAE J429, ensuring consistent quality and interoperability in demanding applications.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for safe usage.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction equipment, and automotive systems. The steel material and UNF fine threading provide superior grip and fatigue resistance, reducing the risk of thread stripping under dynamic loads. The flanged design distributes clamping force evenly, preventing surface damage and enhancing joint integrity. With a partial thread and right-hand direction, it ensures precise engagement in blind holes or where unthreaded shank sections are needed for shear strength. Ideal for applications requiring high tensile strength and reliable performance, this fastener minimizes downtime and maintenance costs in demanding environments.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and inch system measurements. It meets manufacturing specifications under IFI 111/SAE J429 for Grade 8 fasteners, ensuring reliability in high-strength applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and regulatory alignment for global use.