S-90409A116 1/4"-20 x 1 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
• Superior wear resistance due to Rockwell C32 hardness, extending service life in high-stress environments
• Enhanced stability and vibration resistance from the integrated flange design that distributes load evenly
• Quick installation and removal with external hex drive and coarse UNC threads for efficient assembly
• Precise thread engagement with Class 2A thread fit ensuring reliable fastening in industrial equipment
• Reduced material stress through partial threading that concentrates strength where needed most
• Environmental compliance assurance meeting RoHS 3 and REACH standards for sustainable operations

Professional Applications & Engineering Value

These Grade 8 hex head screws with 1/4"-20 UNC coarse threads and steel construction solve critical challenges in heavy machinery, automotive assemblies, and structural frameworks. The flanged design eliminates the need for separate washers while providing superior clamping force distribution, preventing joint loosening under extreme vibration. With partial threading concentrating strength in the engaged section, these fasteners resist shear forces in pivot points and bearing applications. The external hex drive accommodates high-torque installation, making them ideal for confined spaces in equipment maintenance and manufacturing lines where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to SAE J429 standards with IFI 111 specification verification, these screws maintain precise Class 2A thread fit tolerances for consistent performance. The 1/4"-20 UNC coarse thread profile ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage across global markets. Dimensional accuracy includes 1 3/4" length with 3/4" minimum thread length and 9/16" flange diameter for standardized implementation.