S-90602A247 5/16"-18 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 capacity with 150,000 PSI tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance from zinc yellow-chromate plating that extends service life in harsh industrial environments
• Optimized torque transmission through the external hex drive design for secure installation and removal
• Enhanced stability and load distribution thanks to the integrated flange that eliminates the need for separate washers
• Precision thread engagement with Class 2A thread fit ensuring consistent fastening performance
• Reduced cross-threading risk through UNC coarse threading that facilitates faster assembly in industrial settings
• Verified quality assurance meeting SAE J429/IFI 111 specifications for guaranteed mechanical properties and reliability

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this Grade 8 hex head screw delivers exceptional mechanical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection in challenging environments, while the 150,000 PSI tensile strength and Rockwell C32 hardness ensure structural integrity under extreme loads. The partially threaded design with UNC coarse threading offers optimal grip in materials where vibration resistance is critical, and the integrated flange distributes clamping force evenly, reducing point stress concentrations. These heavy-duty hex bolts are ideal for machinery assembly, structural frameworks, and equipment manufacturing where high-strength fasteners must withstand dynamic loads and environmental exposure while maintaining precise Class 2A thread fit for consistent performance.

Specification Summary & Compliance

This fastener features precision 5/16"-18 UNC coarse threading with Class 2A thread fit tolerance for reliable engagement. The 2 1/4" length with 7/8" minimum thread length provides optimal fastening depth. Manufacturing complies with SAE J429 and IFI 111 specifications, ensuring consistent Grade 8 mechanical properties including 150,000 PSI tensile strength and Rockwell C32 hardness. The zinc yellow-chromate plating offers corrosion protection while maintaining dimensional accuracy across all critical parameters including 1/2" head width and 11/16" flange diameter.