S-92979A348 3/8"-16 x 1 1/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 110,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Zinc-plated steel construction provides excellent corrosion resistance, extending service life in harsh industrial environments.
• Flanged head design eliminates the need for a separate washer, simplifying installation and providing a larger bearing surface for improved load distribution.
• UNC coarse threading with Class 2A fit allows for faster assembly and better performance in materials where fine threads are not required.
• External hex drive offers high torque capability and easy installation with common tools, enhancing efficiency on the production line.
• Grade 5 classification guarantees consistent mechanical properties, providing dependable strength for heavy-duty fastening applications.
• Full threading along the entire shank ensures maximum grip and holding power across the entire length of the screw.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex head screw is engineered to solve critical fastening challenges in industrial settings. The combination of 110,000 psi tensile strength and Rockwell C22 hardness provides exceptional resistance to vibration loosening and structural fatigue, making it ideal for heavy machinery, construction equipment, and automotive assemblies. The UNC coarse thread design ensures quick installation in steel, wood, and other materials where rapid assembly is paramount. The zinc plating offers superior protection against rust and corrosion, significantly extending maintenance intervals in outdoor or high-moisture environments. With its flanged head and external hex drive, this fastener delivers reliable performance in applications requiring high clamp load and easy serviceability.

Specification Summary & Compliance

This hex head screw features precise 3/8"-16 UNC coarse threading with Class 2A thread fit for consistent engagement. Manufacturing complies with IFI 111 specifications where identified as SAE J429, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications.