S-90409A139 3/8"-16 x 2 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 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior durability achieved through Rockwell C32 hardness rating, resisting wear and deformation under heavy use
• Optimized installation efficiency with external hex drive design providing secure tool engagement and torque transmission
• Enhanced stability and distribution through integrated flange design that eliminates the need for separate washers
• Secure fastening in various materials with UNC coarse thread pattern that resists loosening from vibration
• Precision thread fit meeting Class 2A specifications ensures consistent performance and easy assembly
• Environmental compliance assurance with RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides exceptional resistance to shear and tensile forces in machinery, structural assemblies, and equipment manufacturing. The partial threading design offers optimal grip length while the flanged feature distributes clamping force evenly, preventing surface damage and maintaining joint integrity. The UNC coarse thread pattern ensures rapid installation and superior performance in softer materials or where vibration resistance is crucial. Engineered to meet IFI 111/SAE J429 standards, this external hex drive fastener provides reliable performance in construction, automotive, and industrial machinery applications where consistent torque values and long-term reliability are paramount.

Specification Summary & Compliance

This 3/8"-16 UNC hex head screw features Class 2A thread fit tolerances for precise assembly compatibility. Manufactured to IFI 111 specifications where identified with SAE J429 requirements, ensuring consistent quality and performance. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant as of June 14, 2023, meeting current environmental regulations for hazardous substance restrictions. The inch system measurements, including the 2 3/4" length and 9/16" head width, maintain dimensional accuracy for reliable interchangeability in industrial applications.