S-94239A127 5/16"-18 x 1/2" IFI 111 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Grade 8 classification, providing 150,000 PSI tensile strength for reliable performance in high-stress environments.
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh or outdoor industrial settings.
• Enhanced stability and vibration resistance due to serrated locking flange, reducing loosening under dynamic loads.
• Easy installation and removal with external hex drive and coarse UNC threads, ensuring quick assembly in heavy-duty applications.
• Precise fit and interchangeability with Class 2A thread fit, minimizing cross-threading and improving assembly efficiency.
• High hardness rating of Rockwell C33, offering excellent wear resistance and longevity under repetitive use.
• Compliance with industry standards including IFI 111 and SAE J429, guaranteeing consistent quality and reliability for engineering projects.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where strength and corrosion resistance are critical. Made from zinc yellow-chromate plated steel, it effectively combats rust and degradation in environments exposed to moisture, chemicals, or temperature variations. The fully threaded UNC coarse spacing design allows for faster installation and higher clamping force in materials like metal, machinery, and structural assemblies. The external hex drive and flanged design with serrations provide secure tightening and prevent rotation under vibration, common in automotive, construction, and heavy equipment sectors. By meeting IFI 111 and SAE J429 specifications, it ensures dependable performance in heavy-duty fastening tasks, reducing maintenance needs and downtime.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse thread with a 5/16"-18 size. It complies with IFI 111 and SAE J429 specifications, ensuring material and mechanical properties meet industry requirements for high-strength applications. The zinc yellow-chromate plating offers environmental protection, aligning with common industrial safety and performance expectations.