S-92316A229 1/2"-13 x 5 1/2" 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 high-stress applications, preventing fastener failure.
• Superior corrosion resistance from the black phosphate steel coating extends service life in harsh industrial environments.
• High-strength Grade 8 classification and Rockwell C32 hardness provide dependable durability and resistance to wear.
• Precise Class 3A thread fit and UNC coarse thread design enable easier, faster assembly and secure fastening.
• Integrated flange eliminates the need for a separate washer, distributing load evenly and simplifying installation.
• Partially threaded shank allows for unthreaded grip length, providing enhanced clamping force and vibration resistance.
• External hex drive and hex head offer high torque capability and easy installation with standard tools.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where failure is not an option. The black phosphate steel coating provides a robust barrier against rust and corrosion, making it ideal for outdoor machinery, construction equipment, and automotive assemblies exposed to moisture. Its 1/2"-13 UNC coarse thread and Class 3A thread fit ensure quick, secure fastening even in vibrating environments, reducing maintenance downtime. The partially threaded design and integrated flange enhance joint integrity by concentrating clamping force where it's needed most, preventing loosening under dynamic loads. These features collectively solve common engineering challenges like corrosion-induced degradation, assembly inefficiency, and joint failure, delivering long-term reliability in heavy-duty fastening scenarios.

Specification Summary & Compliance

This fastener meets precise dimensional standards with a Class 3A thread fit for superior thread engagement and a UNC coarse thread profile. It is manufactured in accordance with IFI 111 / SAE J429 specifications for Grade 8 mechanical properties, ensuring consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms it is free from hazardous substances, making it suitable for regulated industries and environmentally conscious projects.