S-90393A121 3/8"-16 x 3/4" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load distribution with a 13/16" flange that eliminates the need for separate washers and prevents surface damage
• Superior vibration resistance due to serrated locking under the flange, maintaining clamp force in high-stress environments
• High-strength performance with Grade 5 classification and 120,000 psi tensile strength for demanding industrial applications
• Efficient installation using a standard 9/16" external hex drive, allowing for high torque application with common tools
• Reliable thread engagement with UNC coarse threads and Class 2A fit, providing quick assembly and reduced cross-threading risk
• Full-length threading enabling maximum adjustability and secure fastening throughout the entire 3/4" length
• Consistent hardness at Rockwell C22 ensuring durability and resistance to wear under repeated use

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value through its flanged design with serrations that solve critical industrial fastening challenges. The integrated flange distributes clamping force over a wider area, preventing surface damage to softer materials while the serrations provide vibration-resistant locking in machinery, automotive assemblies, and structural applications. The 3/8"-16 UNC coarse thread configuration ensures rapid installation in production environments while maintaining Class 2A thread fit precision. With 120,000 psi tensile strength and Rockwell C22 hardness, this fully threaded fastener maintains integrity under heavy loads and dynamic stress conditions, making it ideal for construction equipment, manufacturing machinery, and transportation applications where reliability is paramount.

Specification Summary & Compliance

This inch system fastener features precise Class 2A thread fit tolerance with UNC coarse threading (3/8"-16) and right-hand thread direction. Manufactured to meet IFI 111/SAE J429 specifications for Grade 5 fasteners, it ensures consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global supply chains and environmentally conscious manufacturing operations.