S-90602A275 3/4"-10 x 4" 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 the most demanding industrial applications, preventing fastener failure under high stress.
• Superior corrosion resistance from the zinc yellow-chromate plating protects the steel core, extending the screw's service life in harsh environments.
• High-strength Grade 8 classification and Rockwell C32 hardness provide excellent durability and resistance to wear and deformation.
• Flanged head design eliminates the need for a separate washer, distributing clamp load effectively and speeding up assembly.
• Coarse UNC threading offers faster installation and superior performance in materials where fine threads might strip or cross-thread.
• Partially threaded shank allows for unthreaded grip length, providing superior clamping force where it's needed most.
• Compliance with IFI 111/SAE J429 specifications guarantees consistent quality, dimensional accuracy, and interchangeability for professional use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for heavy-duty industrial fastening where failure is not an option. The zinc yellow-chromate plated steel construction combats corrosion, making it ideal for outdoor machinery, construction equipment, and automotive assemblies exposed to the elements. The coarse UNC thread and partial threading provide a strong, reliable grip in softer materials or applications subject to vibration, reducing the risk of loosening. The integral flange acts as a built-in washer, increasing the bearing surface and improving joint integrity. This combination of high tensile strength, robust external hex drive for high-torque installation, and strict standard compliance delivers a fastener that solves critical challenges in structural connections, heavy machinery, and high-stress frameworks.

Specification Summary & Compliance

This screw features a 3/4"-10 UNC thread with a Class 2A thread fit for consistent assembly. It is manufactured to meet the dimensional and mechanical requirements of IFI 111 where it references SAE J429 for Grade 8 material properties. The specified Rockwell C32 hardness and 150,000 psi minimum tensile strength are verified per this standard, ensuring reliability for professional and engineering use.