S-90409A204 3/4"-10 x 3 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior durability and wear resistance thanks to Rockwell C32 hardness and Grade 8 steel construction
• Enhanced stability and vibration resistance from the integrated flange that eliminates the need for separate washers
• Easy installation and secure fastening with external hex drive and coarse UNC threads for quick assembly
• Precise thread engagement with Class 2A thread fit ensuring consistent performance and reduced galling
• Optimized weight distribution through partial threading that maintains strength while reducing material usage
• Industry-standard compliance meeting IFI 111 and SAE J429 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

This Grade 8 hex head flange screw delivers exceptional engineering value in demanding industrial environments where fastener failure is not an option. The heavy-duty steel construction combined with 150,000 psi tensile strength provides critical reliability in structural applications, machinery assembly, and heavy equipment manufacturing. The integrated flange design eliminates washer requirements while distributing clamp load over a wider surface area (1 19/32" diameter), preventing surface damage and maintaining joint integrity under vibration. The coarse UNC threads and Class 2A thread fit ensure rapid installation in tough materials while maintaining precise tolerances. This partially threaded configuration provides optimal strength-to-weight ratio, making it ideal for applications requiring both high clamping force and material efficiency in construction, automotive, and industrial machinery sectors.

Specification Summary & Compliance

This heavy-duty fastener features precise Class 2A thread fit with 3/4"-10 UNC coarse threads and right-hand threading direction. Manufactured to exacting IFI 111 specifications where identified as meeting SAE J429 standards for Grade 8 fasteners. The inch system measurement ensures compatibility with North American industrial equipment and replacement part requirements. The partially threaded design provides 1 3/4" minimum thread length on a 3 1/2" overall length screw, optimized for secure fastening in thick materials and structural applications.