S-90602A276 3/4"-16 x 2 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threads ensuring secure fastening and vibration resistance
• Enhanced load distribution through the integrated flange design, reducing surface pressure and preventing material damage
• Optimized torque application with external hex drive and substantial 1 1/8" head width for easy installation and removal
• Versatile partial threading allowing unthreaded shank sections to bear shear loads while threaded portions provide clamping force
• Industry-standard compliance meeting SAE J429 specifications for consistent quality and interchangeability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The zinc yellow-chromate plated steel construction provides exceptional corrosion protection in demanding environments, while the 3/4"-16 UNF fine thread configuration offers superior resistance to vibration loosening compared to coarse threads. The partially threaded design with substantial 1 3/4" minimum thread length ensures optimal stress distribution, preventing thread stripping in soft materials. The integrated flange eliminates the need for separate washers, streamlining assembly processes in automotive, construction, and manufacturing applications where reliability and speed of installation are paramount.

Specification Summary & Compliance

This heavy-duty fastener features precise Class 2A thread fit tolerances with 3/4"-16 UNF fine thread spacing in a right-hand thread direction. The screw maintains Rockwell C32 hardness and meets SAE J429 specifications (IFI 111) for Grade 8 fasteners, ensuring consistent mechanical properties and dimensional accuracy. Manufactured in the inch system with a total length of 2 1/2" and flange diameter of 1 19/32", this partially threaded hex head screw complies with industry standards for heavy-duty industrial applications requiring verified performance characteristics.