S-92323A539 5/16"-18 x 1 1/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength with 110,000 psi rating ensures reliable performance in high-stress applications and prevents fastener failure.
• Superior corrosion resistance from zinc-plated steel coating extends service life in harsh industrial environments and reduces maintenance needs.
• Secure locking capability with serrated flange design prevents loosening under vibration, enhancing assembly integrity without separate washers.
• Easy installation and removal with external hex drive and coarse UNC threads provides quick engagement and reduces assembly time.
• Consistent thread quality with Class 2A fit ensures smooth mating with nuts and threaded holes, minimizing cross-threading risks.
• Heavy-duty construction meeting Grade 5 standards offers dependable strength for machinery, equipment, and structural applications.
• Full threading along the 1-1/4" length allows for maximum adjustability and grip in various material thicknesses.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex head screw is engineered to address common industrial challenges such as vibration-induced loosening and environmental corrosion. The serrated locking flange provides a biting action that resists rotation, making it ideal for automotive assemblies, machinery frames, and electrical enclosures where stability is critical. With coarse UNC threads and fully threaded design, it ensures rapid installation in steel, wood, or composite materials, reducing labor time while maintaining 110,000 psi tensile strength. The zinc plating adds a protective barrier against moisture and chemicals, prolonging fastener life in outdoor or humid settings. Its compliance with SAE J429 standards guarantees consistent quality for OEM and MRO applications, supporting efficient production and reliable performance in demanding conditions.

Specification Summary & Compliance

This fastener features a 5/16"-18 UNC thread with Class 2A thread fit for precise dimensional accuracy and smooth assembly. It meets IFI 111 specifications under SAE J429 for Grade 5 mechanical properties, ensuring hardness of Rockwell C22 and tensile strength of 110,000 psi. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for global industrial use.