S-90409A182 5/8"-11 x 4 1/2" 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 high-stress applications, reducing the risk of fastener failure.
• Superior Wear Resistance: Rockwell C32 hardness provides excellent durability and resistance to deformation under heavy loads, extending service life.
• Enhanced Stability & Distribution: Integrated flange design eliminates the need for a separate washer, providing a larger bearing surface for improved load distribution and joint stability.
• Optimized for Quick Assembly: Coarse UNC threads and external hex drive allow for faster installation and removal with standard tools, saving valuable labor time.
• Secure Thread Engagement: Class 2A thread fit offers consistent, reliable fastening with standard nuts, minimizing cross-threading and ensuring uniform clamping force.
• Versatile Partial Threading: The partially threaded shank provides an unthreaded grip length for precise clamping in structural connections, preventing loosening from vibration.
• Guaranteed Quality & Compliance: Manufactured to meet IFI 111/SAE J429 standards and compliant with RoHS 3 & REACH, ensuring material safety and international regulatory acceptance.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The flanged design increases the clamping surface area, which helps prevent surface damage and distributes load more effectively than standard hex bolts, reducing stress concentrations. The coarse UNC thread and partial threading provide superior grip in softer materials and structural steel, maintaining joint integrity under dynamic loads. Made from high-strength steel and treated to a Rockwell C32 hardness, it resists wear and fatigue in demanding environments, making it an ideal choice for bolting applications that require dependable, long-term performance without frequent maintenance or replacement.

Specification Summary & Compliance

This fastener features a 5/8"-11 UNC coarse thread with a Class 2A thread fit for consistent dimensional accuracy and compatibility. It is manufactured in compliance with IFI 111 / SAE J429 specifications for Grade 8 mechanical properties, ensuring reliable performance. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use worldwide.