S-90409A162 1/2"-20 x 1 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding environments with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior wear and deformation resistance due to Rockwell C32 hardness, extending the screw's service life in rigorous applications.
• Secure and stable fastening with the integrated flange design, which distributes load effectively and eliminates the need for a separate washer.
• Precise and reliable thread engagement thanks to the Class 2A thread fit and fine UNF 1/2"-20 threading, reducing the risk of cross-threading.
• Easy installation and removal with the external hex drive and 3/4" head width, allowing for standard wrench use in confined spaces.
• Optimized for partial thread applications where unthreaded shank sections provide enhanced shear strength and alignment.
• Compliance with major industrial and environmental standards including SAE J429, RoHS 3, and REACH, ensuring safety and regulatory adherence.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and durability are non-negotiable. The steel material and Rockwell C32 hardness provide excellent resistance to vibration loosening and fatigue, making it ideal for engine components, structural frames, and equipment subjected to dynamic loads. The flanged design increases bearing surface area, reducing surface pressure and preventing damage to softer materials. With a 1/2"-20 UNF fine thread and partial threading, it offers superior clamping force in right-hand thread applications, ensuring joint integrity in high-stress environments while meeting SAE J429 specifications for consistent quality.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 2A thread fit for consistent assembly and UNF fine thread specifications. It meets IFI 111 / SAE J429 for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.