S-94239A128 5/16"-18 x 3/4" IFI 111 High-Strength Grade 8 Steel Serrated-Flange 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 through zinc yellow-chromate plating that extends service life in harsh environments
• Secure anti-loosening performance with serrated locking features that maintain clamp force under vibration
• Optimized torque transmission via external hex drive design for efficient installation with standard tools
• Enhanced bearing surface from the integrated flange that distributes load and prevents surface damage
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit and reliable assembly
• Certified heavy-duty performance meeting IFI 111 and SAE J429 standards for quality assurance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional mechanical properties where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection for outdoor equipment, machinery, and structural assemblies exposed to environmental challenges. The combination of fully threaded UNC coarse threads and external hex drive enables rapid installation in high-volume production environments while maintaining precise Class 2A thread fit. The integrated serrated locking feature beneath the flange head eliminates the need for additional locking components, reducing assembly time and preventing costly vibration-induced failures in automotive, construction, and heavy equipment applications where IFI 111 and SAE J429 compliance is mandatory.

Specification Summary & Compliance

This 5/16"-18 x 3/4" hex head screw features precision UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufactured to meet IFI 111 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The Grade 8 classification guarantees minimum 150,000 psi tensile strength and Rockwell C33 hardness. The zinc yellow-chromate plating provides corrosion resistance while maintaining compliance with industrial fastener standards for heavy-duty applications.