S-92316A241 5/8"-11 x 4 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 the most demanding heavy-duty applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black phosphate steel coating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• High-strength Grade 8 classification and Rockwell C32 hardness provide excellent durability and resistance to wear and deformation under high stress.
• Secure and stable fastening is achieved with the UNC coarse thread and Class 2A thread fit, allowing for easier alignment and reduced cross-threading in coarse materials.
• Enhanced load distribution from the integral flange design eliminates the need for a separate washer, saving assembly time and providing a larger bearing surface.
• Optimized for high-torque applications with the external hex drive and hex head, enabling efficient installation and removal with standard tools.
• Partially threaded shank allows for unthreaded grip length, providing superior clamping force where needed without weakening the threaded section.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical challenges in heavy-duty industrial applications, such as construction machinery, automotive assemblies, and structural frameworks. The black phosphate steel material offers a robust barrier against rust and corrosion, significantly enhancing longevity in outdoor or chemically aggressive settings. Its UNC coarse threading and Class 2A thread fit ensure quick, reliable engagement in coarse materials like cast iron or thick steel, reducing installation time and improving joint integrity. The partially threaded design concentrates clamping force precisely where required, preventing thread damage in high-vibration environments. With a flanged head, it distributes load evenly, minimizing surface damage and providing a secure, washer-less solution for high-stress connections, making it an indispensable component for engineers prioritizing safety, efficiency, and compliance.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse thread spacing with a size of 5/8"-11. It meets SAE J429 specifications for Grade 8 mechanical properties, ensuring high tensile strength and hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, supporting sustainable and safe industrial use. Manufactured in accordance with IFI 111 where applicable, this screw guarantees reliability and performance in regulated environments.