S-90409A122 5/16"-18 x 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Grade 8 steel construction with Rockwell C32 hardness provides superior durability and resistance to wear, extending service life in demanding environments.
• Flanged hex head design offers increased bearing surface for better load distribution and eliminates the need for a separate washer, simplifying installation.
• Coarse UNC threads with Class 2A fit enable quick and easy assembly, reducing installation time and minimizing cross-threading risks.
• Fully threaded shank allows for maximum grip and adjustability across the entire length, ensuring secure fastening in various material thicknesses.
• Compliance with SAE J429 and IFI 111 standards guarantees consistent quality and interchangeability, meeting rigorous industrial specifications.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence, making it suitable for global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration and dynamic loads are common. The steel material and 150,000 PSI tensile strength prevent stripping and shear failures under extreme conditions, while the coarse UNC thread and external hex drive facilitate rapid installation with standard tools, reducing labor costs. The flanged design enhances clamping force distribution, minimizing surface damage and improving joint integrity. Ideal for structural frameworks and equipment requiring high-strength fasteners, it ensures long-term reliability in corrosive or high-stress environments, supported by full threading for versatile grip range.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring smooth engagement and interchangeability. It adheres to IFI 111 SAE J429 manufacturing standards, guaranteeing consistent performance in inch-system applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use, providing assurance in global procurement and engineering projects.