S-90602A231 1/2"-13 x 1" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 150,000 PSI, this screw reliably handles extreme mechanical stresses in demanding applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life.
• Precision Thread Fit: The Class 3A UNC coarse thread ensures a secure, vibration-resistant connection, minimizing the risk of loosening under load.
• High-Strength Material Grade: Manufactured as Grade 8 with a Rockwell C32 hardness, it offers excellent durability and resistance to wear and shear forces.
• Integrated Flange Design: The built-in flange distributes clamping force over a wider area (1 1/16" diameter), reducing surface pressure and the need for a separate washer.
• Optimized for High-Torque Installation: The external hex drive and 3/4" head width allow for easy application of high tightening torque with standard tools.
• Full Thread Engagement: Being fully threaded along the 1" length provides maximum grip and adjustability in a variety of material thicknesses.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy-duty industrial applications. Its zinc yellow-chromate plated steel construction combats corrosion in harsh environments, from outdoor machinery to manufacturing equipment. The UNC coarse thread spacing and Class 3A thread fit enable quick assembly and a precise, reliable fit that resists vibrational loosening, a common failure point in dynamic systems. The combination of a 150,000 PSI tensile strength and flanged design makes it an ideal choice for structural connections, heavy equipment assembly, and automotive applications where joint integrity under high stress is non-negotiable.

Specification Summary & Compliance

This fastener features a 1/2"-13 UNC thread with a Class 3A fit for precision. It is manufactured to meet the stringent requirements of IFI 111 where identified as SAE J429 for Grade 8 mechanical properties, ensuring consistent quality and performance for industrial use.