S-90393A116 5/16"-18 x 3/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange 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 locking security through integrated serrations that prevent loosening under vibration and dynamic loads
• Optimized torque transmission with external hex drive design allowing for high tightening forces without stripping
• Enhanced stability and load distribution from the flanged design that eliminates the need for separate washers
• Precision threading compatibility with Class 2A UNC coarse threads ensuring easy installation and reliable engagement
• Durable construction with Rockwell C22 hardness providing excellent resistance to wear and deformation
• Full thread coverage along the entire 3/4" length for maximum grip and adjustment flexibility

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The combination of 120,000 PSI tensile strength and Rockwell C22 hardness ensures reliable performance in heavy machinery, construction equipment, and structural assemblies. The serrated locking feature beneath the hex head provides permanent resistance to rotational loosening, eliminating the need for secondary locking devices in vibrating environments. The UNC coarse threading with Class 2A fit enables quick installation and superior thread engagement in various materials, while the flanged design distributes clamping force evenly, preventing surface damage and reducing assembly time. These industrial screws are engineered to maintain joint integrity in the most demanding mechanical systems and construction applications.

Specification Summary & Compliance

This fastener features 5/16"-18 UNC coarse threading with Class 2A thread fit for precise dimensional accuracy and reliable engagement. Manufactured to meet IFI 111 specifications where identified as SAE J429 for Grade 5 mechanical properties. Compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, ensuring environmental responsibility and material safety. The external hex drive configuration and fully threaded design provide consistent performance across industrial applications requiring high-strength fastening solutions.