S-90409A199 3/4"-10 x 1 3/4" 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 extreme stress in heavy machinery and structural applications.
• Superior Durability & Wear Resistance - The Grade 8 steel construction and Rockwell C32 hardness ensure long service life under demanding conditions.
• Secure & Stable Fastening - The integrated flange provides a larger bearing surface, distributing load evenly and reducing the risk of loosening.
• Precision Threading for Reliable Engagement - Class 2A UNC coarse threads ensure consistent, easy assembly and a secure fit with standard nuts.
• Optimized for High-Torque Applications - The external hex drive and 1 1/8" head width allow for high tightening torque with common tools.
• Full Threading for Maximum Grip - The screw is fully threaded, offering superior holding power along the entire 1 3/4" length.
• Compliance with Industry Standards - Meets IFI 111/SAE J429 specifications, guaranteeing consistent quality and performance for industrial use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy-duty industrial applications. Its high-strength steel construction and Rockwell C32 hardness provide exceptional resistance to shear and tensile forces, preventing failure in machinery, construction, and automotive assemblies. The UNC coarse thread and Class 2A thread fit ensure quick, reliable installation with reduced cross-threading risk, while the flanged design eliminates the need for separate washers, streamlining assembly. Fully threaded for maximum grip, it delivers consistent clamping force in high-vibration environments, making it ideal for equipment subjected to dynamic loads.

Specification Summary & Compliance

This screw features precision Class 2A thread fit with UNC coarse threading (3/4"-10) and complies with IFI 111 SAE J429 specifications. Manufactured from Grade 8 steel with a tensile strength of 150,000 psi and Rockwell C32 hardness, it ensures reliable performance in inch-system applications. The product is fully threaded, includes a flange, and is designed for right-hand thread direction, meeting standard industrial requirements for dimensional accuracy and mechanical properties.