S-90602A258 5/8"-11 x 1 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 150,000 PSI tensile strength for reliable performance in high-stress environments
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding industrial conditions
• Enhanced durability through Rockwell C32 hardness, maintaining structural integrity under repeated stress
• Secure fastening with fully threaded UNC coarse spacing for quick installation and vibration resistance
• Increased bearing surface from the integrated flange design, distributing load evenly and preventing surface damage
• Precise thread engagement with Class 2A fit ensuring consistent performance and easy assembly
• Industry compliance meeting SAE J429/IFI 111 specifications for guaranteed quality and interchangeability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical performance advantages for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc yellow-chromate plated steel construction provides essential corrosion protection in harsh environments where moisture and chemicals are present. The UNC coarse thread design enables rapid installation while maintaining superior resistance to vibration loosening - a common failure point in dynamic applications. With fully threaded coverage and external hex drive, installers achieve maximum thread engagement and high torque application capability. The integrated flange eliminates the need for separate washers, streamlining assembly while providing expanded load distribution. These engineering features combine to create a heavy-duty screw solution that reduces maintenance frequency and enhances structural reliability in construction, manufacturing, and transportation equipment.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance for consistent assembly performance and meets UNC coarse thread specifications (5/8"-11). Manufacturing complies with SAE J429 and IFI 111 standards, ensuring dimensional accuracy and mechanical properties. The Grade 8 classification guarantees minimum 150,000 PSI tensile strength and Rockwell C32 hardness. The zinc yellow-chromate plating provides corrosion protection while maintaining compliance with industry regulations for industrial fasteners.