S-90602A214 1/4"-20 x 1 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 demanding industrial conditions
• Precise thread engagement with Class 3A fit and UNC coarse threading for secure fastening and vibration resistance
• Enhanced installation efficiency through external hex drive design and flanged head for simplified tool engagement and increased bearing surface
• Maximum material hardness at Rockwell C32 ensures excellent wear resistance and thread durability
• Full threading along the entire 1-1/4" length allows for adjustable positioning and consistent clamping force
• Industry-standard compliance with SAE J429/IFI 111 specifications guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value for heavy-duty industrial applications where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection in harsh environments, while the 150,000 PSI tensile strength and Rockwell C32 hardness ensure reliable performance under extreme mechanical stress. The flanged design eliminates the need for separate washers, distributing clamp load effectively across wider surfaces. With fully threaded UNC coarse threads and Class 3A precision fit, these fasteners maintain secure connections in high-vibration machinery, structural steel frameworks, and heavy equipment assemblies where loosening could lead to catastrophic failure.

Specification Summary & Compliance

This 1/4"-20 x 1-1/4" hex head screw features Class 3A thread fit with UNC coarse threading and right-hand thread direction. Manufacturing complies with SAE J429/IFI 111 specifications for Grade 8 fasteners, ensuring dimensional accuracy and mechanical properties. The fastener meets industry standards for heavy-duty applications with verified 150,000 PSI tensile strength and Rockwell C32 hardness ratings. Surface treatment provides corrosion resistance while maintaining compliance with industrial fastener requirements.