S-90602A273 3/4"-10 x 3" 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, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
• High hardness rating (Rockwell C32) provides excellent wear resistance and durability under repeated loads.
• Flanged design eliminates the need for separate washers, simplifying installation and distributing load more effectively.
• Coarse UNC threading allows for faster assembly and better performance in materials prone to stripping or vibration.
• Class 2A thread fit ensures consistent, reliable engagement with nuts and tapped holes for secure fastening.
• Grade 8 compliance with SAE J429/IFI 111 guarantees consistent quality and mechanical properties for critical applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where high tensile strength and corrosion resistance are critical. The zinc yellow-chromate plated steel construction provides a durable barrier against rust and chemical exposure, making it ideal for outdoor machinery, construction equipment, and automotive assemblies. The partially threaded design with UNC coarse spacing ensures quick installation and superior grip in soft materials or where vibration resistance is needed. The external hex drive and flanged head offer enhanced torque application and load distribution, reducing the risk of loosening under dynamic loads. These screws are specified in heavy-duty bolting applications requiring SAE J429 compliance and reliable performance in structural connections.

Specification Summary & Compliance

This fastener features a 3/4"-10 UNC thread with Class 2A thread fit for precise dimensional accuracy and reliable engagement. It meets IFI 111 specifications where identified as SAE J429, ensuring consistent mechanical properties and manufacturing quality. The partially threaded configuration with coarse thread spacing provides optimal performance in various materials. The zinc yellow-chromate plating offers environmental protection while maintaining compliance with industry standards for high-strength industrial fasteners.