S-90409A166 1/2"-20 x 2 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for heavy loads with a tensile strength of 150,000 psi, ideal for demanding industrial applications.
• Superior durability and wear resistance due to Rockwell C32 hardness and Grade 8 steel material.
• Reliable fine threading with UNF 1/2"-20 threads and Class 2A fit for precise, secure fastening in high-vibration environments.
• Integrated flange design eliminates the need for separate washers, providing enhanced load distribution and simplified assembly.
• External hex drive compatibility allows for easy installation and removal with standard tools, reducing downtime.
• Compliance with industry standards including IFI 111/SAE J429, ensuring consistent quality and performance.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and vibration resistance are paramount. The partially threaded design with UNF fine threads ensures optimal grip and reduces the risk of loosening under dynamic loads, while the flanged head provides stable seating without additional components. Made from robust steel and finished to precise Class 2A thread fit, it delivers reliable performance in industrial applications requiring long-term durability and minimal maintenance, such as structural assemblies and equipment frames.

Specification Summary & Compliance

This fastener features a 1/2"-20 UNF thread with Class 2A tolerance for accurate fit, a length of 2 1/2", and partial threading up to a minimum of 1 1/4". It conforms to IFI 111/SAE J429 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to safety and environmental standards.