S-90409A127 5/16"-18 x 2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With a 150,000 PSI tensile strength, this screw withstands extreme loads and high-stress conditions, reducing the risk of failure in critical assemblies.
• Superior Hardness & Wear Resistance – Rockwell C32 hardness ensures excellent durability and resistance to deformation, maintaining fastener integrity over repeated use.
• Reliable Flange Design – The integrated flange distributes clamping force evenly, eliminating the need for a separate washer and speeding up installation in tight spaces.
• Precision Thread Fit – Class 2A thread fit provides consistent, secure engagement with mating parts, minimizing loosening under vibration and dynamic loads.
• Heavy-Duty Grade 8 Certification – Meets IFI 111/SAE J429 standards, guaranteeing consistent performance for industrial and automotive applications requiring certified components.
• Coarse UNC Threading – The coarse thread design allows for quicker installation and better performance in materials prone to stripping or where debris accumulation is a concern.
• Environmental & Regulatory Compliance – RoHS 3 and REACH compliance ensures the screw is free from hazardous substances, making it suitable for regulated industries and export markets.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers reliable performance in high-vibration environments such as machinery, construction equipment, and automotive assemblies. The partially threaded design concentrates strength where it's needed most, providing optimal clamp load without unnecessary threading in non-critical sections. Made from high-strength steel and featuring a flanged head, it simplifies installation by combining a washer and screw into one component, reducing part count and assembly time. The external hex drive allows for high-torque application with standard tools, ensuring secure fastening in coarse thread UNC configurations that resist cross-threading and galling. Ideal for structural connections, this fastener meets rigorous SAE J429 specifications, offering peace of mind in projects where failure is not an option.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threading with a 5/16"-18 thread size. Manufactured in compliance with IFI 111 SAE J429, it ensures mechanical properties align with Grade 8 requirements. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it meets environmental regulations for hazardous substance restrictions.