S-90409A206 3/4"-10 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: With a tensile strength of 150,000 PSI, this screw reliably handles high-stress applications, reducing the risk of fastener failure in demanding environments.
• Superior Durability and Wear Resistance: The Grade 8 steel construction and Rockwell C32 hardness ensure long-lasting performance, minimizing wear and the need for frequent replacements.
• Enhanced Stability and Distribution: The integrated flange provides a larger bearing surface, distributing clamp load more evenly and improving joint integrity without requiring a separate washer.
• Optimized for Efficient Installation: The coarse UNC thread and external hex drive allow for quick, secure tightening with standard tools, saving valuable assembly time.
• Reliable Thread Engagement: The Class 2A thread fit offers consistent, secure fastening with standard nuts, ensuring dependable performance in vibration-prone settings.
• Versatile Partial Threading: The design allows the unthreaded shank to bear shear loads effectively, making it ideal for applications where precise clamping is critical.
• Assured Quality and Compliance: Manufactured to meet IFI 111 and SAE J429 specifications, this screw guarantees consistency and reliability for professional industrial use.

Professional Applications & Engineering Value

This 3/4"-10 UNC Grade 8 hex head screw is engineered to address common challenges in heavy machinery, structural frameworks, and high-vibration equipment. Its flanged design eliminates the need for additional washers, providing a secure, flush fit that resists loosening under dynamic loads. The partially threaded shank ensures that the unthreaded portion carries shear forces, while the threaded section delivers robust tensile strength. Made from high-grade steel with a Rockwell C32 hardness, it withstands corrosive industrial environments and repetitive stress, reducing maintenance downtime. Ideal for construction, automotive, and manufacturing sectors, this coarse thread fastener offers a reliable solution for applications demanding superior clamp load and longevity, ensuring your assemblies remain secure and operational.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a UNC coarse thread profile. It is manufactured in compliance with IFI 111 and SAE J429 specifications, ensuring material quality and performance reliability. The screw meets industry requirements for heavy-duty applications, with verified tensile strength and material properties suitable for professional use.