S-90393A113 1/4"-20 x 1" 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 high-stress applications
• Superior wear resistance due to Rockwell C22 hardness, ensuring long-term durability and reduced replacement frequency
• Secure anti-loosening performance provided by serrated flange design, minimizing vibration-induced failures
• Easy installation and removal with external hex drive and coarse UNC threading for efficient assembly in industrial settings
• Precise thread engagement with Class 2A fit, reducing cross-threading risks and improving connection reliability
• Full-length threading across the 1" length offers versatile fastening depth and consistent grip strength
• Regulatory compliance assurance meeting SAE J429, RoHS 3, and REACH standards for safe global industrial use

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The serrated flange creates permanent locking action without requiring additional washers, effectively solving loosening issues in machinery, automotive frames, and heavy equipment assemblies. Its UNC coarse threads with Class 2A fit provide rapid installation in steel structures and aluminum components while maintaining precise tolerance control. The external hex drive accommodates high-torque applications, making it ideal for maintenance operations and production lines where speed and reliability are essential. With 120,000 psi tensile strength and full threading, this fastener ensures uniform stress distribution across the entire 1" length, preventing joint failure in demanding industrial environments.

Specification Summary & Compliance

Manufactured to exact inch system dimensions: 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent interchangeability. The 9/16" flange diameter and external hex drive (3/8" width) provide optimal bearing surface and tool engagement. This fully threaded fastener conforms to IFI 111/SAE J429 specifications for Grade 5 mechanical properties, and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.