S-90393A127 1/2"-13 x 1 1/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure under heavy loads.
• Grade 5 classification and Rockwell C22 hardness provide excellent durability and resistance to wear, extending service life in industrial environments.
• Fully threaded UNC coarse design allows for faster installation and superior grip in a wide range of materials, improving assembly efficiency.
• Serrated flange and external hex drive offer enhanced locking capability and easy torque application, preventing loosening from vibration.
• Compliance with SAE J429, RoHS 3, and REACH standards guarantees material safety and consistency, meeting strict industry and regulatory requirements.
• Precise Class 2A thread fit ensures smooth engagement and reduces cross-threading risks, facilitating quick and secure fastening.
• Robust inch-system dimensions (e.g., 1 1/4" length, 1/2"-13 thread) provide compatibility with standard equipment, simplifying inventory and replacement processes.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address common industrial challenges, such as vibration-induced loosening and high-stress fatigue. The serrated flange acts as an integrated lock washer, distributing clamp load evenly and maintaining tension in dynamic settings like machinery, automotive assemblies, and structural frameworks. Made with UNC coarse threads and fully threaded design, it ensures rapid installation and strong holding power in coarse-grained materials, reducing assembly time and labor costs. The external hex drive allows for high-torque application with standard tools, making it ideal for heavy-duty fastening where reliability is critical. By combining high tensile strength and compliance with standards like SAE J429, this screw delivers consistent performance in construction, manufacturing, and maintenance operations, minimizing downtime and enhancing safety.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading per inch system requirements. It meets SAE J429 specifications for Grade 5 mechanical properties, ensuring reliable strength and hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, supporting environmentally responsible and safe industrial use.