S-90129A116 5/16"-18 x 3/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through black protective coating, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster installation and secure fastening
• Enhanced driving efficiency through external hex drive design allowing high torque application without slippage
• Distributed load bearing with integrated flange design reducing surface pressure and preventing material damage
• Consistent hardness performance at Rockwell C22 ensuring durability and resistance to wear
• Full threading coverage along the 3/4" length providing maximum grip and adjustment flexibility

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions where corrosion resistance and high tensile strength are paramount. The black corrosion-resistant coated steel construction protects against environmental degradation in industrial settings, while the UNC coarse thread pattern ensures rapid assembly and reliable performance in vibration-prone applications. The external hex drive accommodates standard tools for efficient installation, and the flanged design eliminates the need for separate washers, reducing component count and assembly time. Ideal for machinery, structural frameworks, and equipment manufacturing, this fully threaded fastener provides uniform stress distribution and maintains integrity under 120,000 psi tensile loads, making it a trusted choice for engineers specifying heavy-duty industrial fasteners.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) in the inch measurement system. Complies with SAE J429 specifications for Grade 5 mechanical properties, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety. The fastener meets IFI 111 standards where applicable to SAE J429, ensuring consistent quality and performance across industrial applications.