S-92979A245 5/16"-18 x 5/8" 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 demanding applications, reducing the risk of fastener failure.
• Zinc-plated steel construction provides excellent corrosion resistance, extending service life in harsh industrial environments.
• Flange design eliminates the need for separate washers, simplifying installation and providing a larger bearing surface for improved load distribution.
• Grade 5 classification guarantees consistent high-strength performance, meeting rigorous SAE J429 standards for industrial use.
• UNC coarse threading with Class 2A fit allows for quick assembly and disassembly, minimizing installation time and labor costs.
• External hex drive offers superior torque transmission, enabling secure tightening with common tools and reducing slippage.
• Full threading along the 5/8" length provides maximum grip and adjustability in various material thicknesses.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion-induced degradation. The zinc-plated steel material, combined with a Rockwell C22 hardness, ensures durability in high-stress environments like machinery assembly, automotive frameworks, and structural steel connections. The flange design distributes clamping force evenly, preventing surface damage and enhancing joint integrity. With coarse UNC threading and Class 2A fit, it resists cross-threading and allows for rapid installation in coarse-grained materials, reducing downtime in production lines. Ideal for heavy-duty applications, this screw provides reliable fastening in construction, manufacturing, and equipment maintenance, where high tensile strength and compliance with industry standards are critical for safety and performance.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including UNC thread with Class 2A tolerance for consistent fit and performance. It meets IFI 111 specifications under SAE J429 for Grade 5 strength, ensuring reliability in mechanical applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and regulatory requirements in global markets.