S-90409A112 1/4"-20 x 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 industrial applications
• Superior surface durability thanks to Rockwell C32 hardness, resisting wear and deformation under heavy loads
• Enhanced load distribution through integrated flange design, reducing surface pressure and preventing joint loosening
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent, vibration-resistant connections
• Maximum thread coverage through full threading along the entire 3/4" length for superior grip in deep applications
• Industry-standard compliance meeting IFI 111/SAE J429 specifications for guaranteed interchangeability and reliability
• Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use in regulated industries

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The steel construction combined with Rockwell C32 hardness provides superior resistance to shear forces and environmental degradation. The integrated flange design eliminates the need for separate washers while distributing clamp load over a wider surface area, preventing material deformation in soft substrates. With fully threaded UNC coarse threads and Class 2A fit, these screws ensure rapid installation and reliable performance in vibration-prone environments such as heavy machinery, construction equipment, and automotive assemblies. The external hex drive allows for high-torque installation, making them ideal for applications requiring precise preload control and structural integrity.

Specification Summary & Compliance

This 1/4"-20 x 3/4" hex head screw features Class 2A thread fit per UNC standards with coarse thread spacing for optimal engagement. Manufactured to IFI 111 specifications where identified as SAE J429 Grade 8, ensuring consistent mechanical properties and dimensional accuracy. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for use in environmentally sensitive applications and global markets.