S-92316A803 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 under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black phosphate steel coating extends service life in harsh or outdoor industrial environments.
• High-strength Grade 8 classification and Rockwell C32 hardness provide consistent durability and resistance to wear and deformation.
• Flanged hex head design eliminates the need for a separate washer, simplifies installation, and distributes clamping force more effectively.
• UNC coarse threading with Class 2A fit allows for quicker assembly and better performance in materials prone to stripping or where vibration is a concern.
• Full threading along the 2 1/4" length offers versatile fastening depth and secure engagement across the entire bolt.
• Compliance with SAE J429, RoHS 3, and REACH ensures the bolt meets rigorous industry and environmental standards for safe, responsible use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where strength and reliability are non-negotiable. Constructed from black-phosphate steel, it provides enhanced corrosion resistance, making it suitable for machinery, structural assemblies, and heavy equipment exposed to challenging conditions. The flanged design increases bearing surface area, reducing surface pressure and preventing loosening under vibration—common in automotive, construction, and manufacturing settings. The UNC coarse thread and Class 2A fit ensure easy, precise installation in coarse-grained materials, while the external hex drive allows for high-torque application with standard tools. Ideal for high-stress connections, this bolt delivers long-term performance, minimizing maintenance and replacement costs.

Specification Summary & Compliance

This fastener features a 5/8"-11 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. It is manufactured in compliance with SAE J429 specifications for Grade 8 mechanical properties, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free of restricted hazardous substances.