S-92979A269 5/16"-18 x 2" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 110,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Zinc-plated steel construction provides excellent corrosion resistance, extending service life in demanding industrial environments.
• Flanged hex head design eliminates the need for a separate washer, simplifying installation and providing a larger bearing surface.
• Grade 5 classification and SAE J429 compliance guarantee consistent quality and mechanical properties for critical assemblies.
• UNC coarse threading with Class 2A fit allows for faster assembly and better resistance to vibration loosening.
• Partial threading offers an unthreaded shank for precise clamping where shear strength is paramount.
• RoHS 3 and REACH compliance ensures the fastener meets stringent environmental and safety regulations for global supply chains.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex head screw is engineered to solve common industrial challenges such as joint integrity under dynamic loads and corrosion in harsh conditions. The external hex drive and coarse UNC thread facilitate quick and secure installation with standard tools, reducing assembly time. The flanged design distributes clamp load effectively, preventing surface damage and maintaining seal integrity in machinery, structural frames, and heavy equipment. Its partial threading ensures that the unthreaded portion bears shear forces, making it ideal for pivoting joints and precision alignment applications where movement and stress are concentrated. The robust zinc plating acts as a sacrificial layer, significantly enhancing durability against rust and chemical exposure in outdoor or industrial settings.

Specification Summary & Compliance

This fastener adheres to critical dimensional and performance standards, including a Class 2A thread fit for consistent engagement and UNC coarse thread specifications. It is manufactured in compliance with IFI 111 SAE J429, ensuring mechanical properties and material quality. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for hazardous substances.