S-94239A125 3/8"-16 x 1 1/2" IFI 111 High-Strength Grade 8 Steel Serrated-Flange 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 provided by the zinc yellow-chromate plating on steel, extending the screw's service life in harsh or outdoor environments.
• High hardness rating of Rockwell C33 (Grade 8) offers excellent wear resistance and durability, maintaining thread integrity under high stress.
• Integrated flange design eliminates the need for a separate washer, providing a larger bearing surface for more secure and stable fastening.
• Coarse UNC threading with Class 2A fit allows for quicker assembly and better performance in materials where vibration resistance is critical.
• Full threading along the entire 1-1/2" length ensures maximum grip and adjustability in a wide range of material thicknesses.
• Compliance with IFI 111 and SAE J429 standards guarantees consistent quality, dimensional accuracy, and interchangeability for industrial use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for heavy-duty applications where failure is not an option. The zinc yellow-chromate plated steel construction provides a robust barrier against corrosion, making it ideal for machinery, construction, and automotive assemblies exposed to environmental stressors. The external hex drive and coarse UNC thread facilitate rapid installation with standard tools, while the flanged design distributes clamping force effectively, preventing surface damage and loosening under vibration. Its fully threaded body and Class 2A thread fit ensure precise engagement in tapped holes or with nuts, delivering reliable performance in structural connections, equipment frames, and high-load fixtures.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC thread with Class 2A fit for standard dimensional accuracy and interchangeability. It is manufactured to meet IFI 111 and SAE J429 specifications, ensuring consistent mechanical properties and quality. The product complies with industry standards for heavy-duty fasteners and is suitable for applications requiring high tensile strength and corrosion resistance.