S-90602A242 1/4"-20 x 2 1/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 150,000 psi tensile strength for reliable performance in high-stress environments
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial conditions
• Enhanced driving torque capacity through the external hex drive design and 3/8" head width for secure installation
• Optimized thread engagement with Class 2A thread fit ensuring consistent assembly and vibration resistance
• Increased bearing surface area from the 9/16" flange diameter, distributing clamp load more effectively
• Grade 8 material certification guaranteeing Rockwell C32 hardness and compliance with demanding industrial standards
• Versatile partial threading allowing for both clamping and alignment functions in various assembly applications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural assemblies, and equipment requiring high tensile strength fastening. The zinc yellow-chromate plated steel construction provides superior protection against corrosion in outdoor or chemically aggressive environments, while the UNC coarse thread pattern ensures rapid installation and reduced cross-threading risks. The partially threaded design with integrated flange creates an optimal balance between clamping force distribution and alignment precision, making these industrial fasteners ideal for construction equipment, automotive frames, and manufacturing machinery where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent assembly performance. These 1/4"-20 UNC hex head screws comply with SAE J429/IFI 111 specifications for Grade 8 fasteners, ensuring material composition, mechanical properties, and manufacturing quality meet rigorous industrial requirements. The 2 1/4" length with 3/4" minimum thread length provides optimal engagement depth while maintaining structural integrity under maximum load conditions.