S-92620A403 4-40 x 1/2" SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized installation efficiency through external hex drive design and coarse UNC threading for faster assembly
• Consistent thread engagement ensured by Class 2A thread fit and full threading along the entire 1/2" length
• High durability backed by Rockwell C33 hardness and Grade 8 classification for repeated use without deformation
• Industry-standard compliance meeting SAE J429 specifications for quality assurance in professional applications
• Versatile right-hand threading compatible with standard components for broad industrial use

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where failure is not an option. The steel construction combined with zinc yellow-chromate plating creates a robust barrier against corrosion, making it ideal for automotive assemblies, machinery frames, and structural components exposed to environmental stressors. The 4-40 UNC coarse thread spacing provides superior resistance to vibration loosening while maintaining quick installation times. With full threading along its 1/2" length, it ensures maximum grip strength across joined materials, solving common challenges of joint integrity in high-vibration environments. The external hex drive design accommodates standard tools for secure tightening in confined spaces, delivering engineering value through reliable fastening solutions that withstand extreme operational demands.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance for consistent mating with corresponding nuts and threaded holes. Manufactured to UNC thread standards with right-hand direction and coarse spacing. Complies with SAE J429 specifications for Grade 8 mechanical properties and meets industry standards for heavy-duty fasteners. The zinc yellow-chromate finish provides environmental protection while maintaining dimensional accuracy throughout the 1/2" length and 4-40 thread size.