S-90409A167 1/2"-20 x 2 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 8 strength rating and 150,000 psi tensile strength for critical structural applications
• Enhanced vibration resistance through UNF fine threading and Class 2A thread fit for secure, long-lasting connections
• Simplified installation and removal with external hex drive design providing superior torque transmission
• Increased bearing surface area from the integrated flange, distributing clamp load more effectively
• Optimized thread engagement with partial threading allowing for precise positioning in deep applications
• Superior durability with Rockwell C32 hardness steel construction resisting wear and deformation
• Regulatory compliance assurance meeting SAE J429 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where failure is not an option. The steel construction with Rockwell C32 hardness ensures reliable performance under extreme stress conditions, while the 1/2"-20 UNF fine threading provides superior resistance to vibration loosening compared to coarse thread alternatives. The flanged design eliminates the need for separate washers, streamlining assembly processes in automotive, heavy machinery, and structural applications. The partial threading allows for precise clamp load control in thick materials, making it ideal for equipment manufacturing and construction projects requiring high-strength bolting solutions that maintain integrity under continuous operational stress.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance for consistent engagement and meets IFI 111/SAE J429 specifications for dimensional accuracy and mechanical properties. The 1/2"-20 UNF fine thread configuration ensures precise thread spacing, while the 2-3/4" length with 1-1/4" minimum thread length provides optimal fastening capability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility, making this Grade 8 hex head screw suitable for global industrial applications requiring certified quality and performance standards.