S-90393A115 5/16"-18 x 1/2" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Grade 5 classification provides consistent hardness (Rockwell C22) and durability for demanding industrial environments.
• Coarse UNC threading allows for faster installation and better resistance to vibration loosening in machinery and equipment.
• Integrated flange design eliminates the need for a separate washer, distributing load evenly and speeding up assembly processes.
• External hex drive offers superior torque transmission for secure tightening with standard tools, minimizing slippage.
• Full threading along the 1/2" length ensures maximum grip and adjustability in various material thicknesses.
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address common industrial challenges such as joint integrity and corrosion resistance in heavy-duty assemblies. The 5/16"-18 UNC coarse thread and Class 2A fit provide excellent engagement in metals and composites, reducing the likelihood of cross-threading during high-volume production. With a flanged design, it simplifies installation in automotive frames, construction equipment, and machinery by acting as an integrated washer, which prevents surface damage and maintains clamp force under dynamic loads. The external hex drive ensures compatibility with standard wrenches, facilitating quick maintenance and disassembly. Manufactured to meet IFI 111/SAE J429 standards, this screw delivers consistent performance in applications requiring 120,000 PSI tensile strength, making it ideal for structural connections where reliability is critical.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including UNC coarse threads with Class 2A fit for consistent engagement. It conforms to IFI 111 SAE J429 for mechanical properties and manufacturing consistency. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use worldwide.