S-92323A534 5/16"-18 x 5/8" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc plating for extended service life in harsh industrial environments
• Superior load-bearing capability with Grade 5 classification and 110,000 psi tensile strength for demanding applications
• Secure anti-loosening performance through serrated flange design that bites into mating surfaces
• Optimized installation efficiency with external hex drive and coarse UNC threads for faster assembly
• Precise thread engagement with Class 2A fit ensuring consistent performance across mating components
• Full-threaded design providing maximum grip length and uniform stress distribution
• Regulatory compliance assurance meeting SAE J429, RoHS 3, and REACH standards for global applications

Professional Applications & Engineering Value

These Grade 5 zinc-plated steel hex head screws deliver exceptional performance in heavy-duty mechanical fastening applications where vibration resistance and structural integrity are paramount. The serrated locking flange eliminates the need for separate washers while providing superior anti-rotation characteristics, making them ideal for automotive assemblies, machinery frames, and structural steel connections. The UNC coarse thread configuration ensures rapid installation in both thin and thick materials, while the Rockwell C22 hardness maintains thread form under repeated disassembly cycles. The zinc-plated steel construction offers reliable corrosion protection in moderate environments, extending maintenance intervals and reducing total cost of ownership for industrial equipment manufacturers and maintenance teams.

Specification Summary & Compliance

Manufactured to IFI 111 specifications meeting SAE J429 Grade 5 requirements with Class 2A thread fit tolerance for consistent mating performance. Features 5/16"-18 UNC coarse threads with 0.3125" diameter and 5/8" length in fully threaded configuration. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for global market acceptance and sustainable manufacturing practices.