S-90602A256 1/2"-20 x 1 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 corrosion resistance through zinc yellow-chromate plating that protects against rust and environmental degradation
• Precise thread engagement with Class 2A thread fit and UNF fine threading for secure, vibration-resistant connections
• Enhanced installation efficiency with external hex drive design allowing for high torque application and easy wrench access
• Increased bearing surface area from the integrated flange that distributes load pressure and prevents surface damage
• Verified material integrity with Rockwell C32 hardness ensuring dimensional stability under extreme conditions
• Industry-standard compliance meeting SAE J429/IFI 111 specifications for guaranteed 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 superior corrosion protection in harsh environments, while the 1/2"-20 UNF fine threading maintains secure fastening under vibration and dynamic loads. The partially threaded design with 1 3/4" length offers optimal grip range for varied material thicknesses, and the flanged head eliminates the need for separate washers, reducing assembly time and component count. These industrial fasteners are engineered to withstand extreme tension and shear forces in construction, automotive, and manufacturing applications where reliability is paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNF fine thread spacing ensuring consistent performance across applications. The fastener complies with SAE J429 and IFI 111 specifications for Grade 8 mechanical properties, guaranteeing 150,000 psi tensile strength and Rockwell C32 hardness. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection, while the external hex drive and flange design meet ASME standards for industrial fastener applications requiring high torque capability and load distribution.