S-90409A164 1/2"-20 x 2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in the most demanding, high-stress industrial applications.
• Superior Wear and Corrosion Resistance: Made from high-strength steel with a Rockwell C32 hardness for enhanced durability and a longer service life in harsh environments.
li>Secure and Stable Fastening: The integrated flange design distributes load pressure over a wider area, reducing the risk of surface damage and providing a more secure hold without the need for a separate washer.
• Precision Thread Engagement: A 1/2"-20 UNF fine thread with a Class 2A fit offers excellent vibration resistance and ensures a tight, secure connection in precision assemblies.
• Optimized for High-Torque Applications: The 3/4" external hex head provides a robust drive surface, allowing for high torque application with standard tools and minimizing the risk of stripping.
• Versatile Partial Threading: The partially threaded shank allows the unthreaded portion to act as a precision pilot or bearing surface, preventing clamp load from being applied to the threads.
• Guaranteed Quality and Safety: Compliant with IFI 111/SAE J429 standards, RoHS 3, and REACH, ensuring material quality, performance consistency, and environmental safety.

Professional Applications & Engineering Value

This Grade 8 Hex Head Screw is engineered for heavy-duty applications where failure is not an option. The combination of high-strength steel and a Rockwell C32 hardness directly addresses the common industrial challenges of joint fatigue and material failure under extreme vibration and load. The UNF fine thread provides a greater number of threads per inch compared to a coarse thread, resulting in a larger stress area and superior resistance to loosening from vibration, making it ideal for precision machinery, automotive assemblies, and construction equipment. The flanged design eliminates the need for a separate washer, simplifying inventory and speeding up assembly while providing a larger bearing surface to protect softer materials from damage. This screw delivers engineering value by enhancing the structural integrity and longevity of critical connections.

Specification Summary & Compliance

This fastener features a 1/2"-20 UNF fine thread with a precision Class 2A thread fit for consistent and reliable engagement. It is manufactured to meet the rigorous mechanical and material specifications of IFI 111 SAE J429. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to strict environmental and safety standards for industrial use.