S-90602A240 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 Grade 8 classification and 150,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh industrial environments
• Optimized torque transmission with external hex drive and 3/4" head width for secure installation and removal
• Enhanced stability and load distribution from the integrated flange design that eliminates the need for separate washers
• Precise thread engagement with Class 3A thread fit ensuring consistent fastening performance and vibration resistance
• Versatile partial threading allowing unthreaded shank sections to function as precision alignment pins when needed
• Industry-standard compatibility with UNC coarse threads that prevent cross-threading and enable quick assembly

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional mechanical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion resistance for outdoor equipment, machinery frames, and structural assemblies exposed to harsh environments. The partially threaded design with UNC coarse threads ensures optimal clamping force distribution while the integrated flange eliminates washer requirements, simplifying inventory and installation processes. These screws are particularly valuable in construction equipment, automotive frames, and industrial machinery where 150,000 psi tensile strength and Rockwell C32 hardness prevent stripping, shearing, and fatigue failure under extreme vibration and load conditions.

Specification Summary & Compliance

Manufactured to exacting IFI 111/SAE J429 specifications with Class 3A thread fit precision and UNC 1/2"-13 thread profile. These 4-inch hex head screws feature a 33/64" head height and 1 1/16" flange diameter for consistent dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across regulated industries. The inch system measurement and external hex drive design maintain compatibility with standard industrial tooling and assembly processes.