S-90409A158 1/2"-13 x 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 industrial applications
• Superior hardness and durability achieved through Rockwell C32 rating, ensuring extended service life under demanding conditions
• Optimized torque transmission via external hex drive design that prevents tool slippage during installation
• Enhanced stability and distribution from the integrated flange that eliminates the need for separate washers
• Precise thread engagement with Class 2A thread fit and 1/2"-13 UNC coarse threading for faster assembly in tough materials
• Controlled thread application through partial threading that provides unthreaded shank strength where needed
• Regulatory compliance assurance meeting SAE J429/IFI 111 standards plus RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 150,000 PSI tensile strength combined with Rockwell C32 hardness provides exceptional resistance to vibration loosening and fatigue failure in dynamic load environments. The 1/2"-13 UNC coarse thread configuration ensures rapid installation in steel frameworks and structural components, while the partial threading design maintains maximum shank strength in shear load applications. The external hex drive facilitates high-torque installation with standard tools, and the integrated flange distributes clamping force evenly, preventing surface damage and maintaining joint integrity. These heavy-duty hex screws are engineered to withstand extreme conditions in construction, manufacturing, and transportation equipment where failure is not an option.

Specification Summary & Compliance

This 4" length hex head screw features precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse thread specifications. Manufacturing complies with IFI 111/SAE J429 standards for Grade 8 fasteners, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety and restricted substances.