S-92620A809 5/8"-11 x 4" ASME B18.2.1, 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 and Rockwell C33 hardness for reliable performance in high-stress applications
• Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
• Optimized thread engagement with UNC coarse spacing and Class 2A fit ensuring secure fastening and vibration resistance
• Maximum thread coverage with fully threaded design providing consistent clamping force along the entire 4" length
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and quality
• Enhanced installation efficiency featuring external hex drive and hex head design for straightforward wrench access
• Dimensional precision with right-hand thread direction and standardized inch measurements for seamless integration

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this Grade 8 hex head screw delivers critical reliability where failure is not an option. The 150,000 psi tensile strength and Rockwell C33 hardness provide exceptional resistance to shear and tensile forces in heavy machinery, structural steel connections, and equipment manufacturing. The zinc yellow-chromate plating creates a robust barrier against corrosion in outdoor applications or moisture-prone facilities. With UNC coarse threading and Class 2A fit, these screws offer superior vibration resistance and faster installation in construction, automotive assembly, and industrial maintenance applications. The fully threaded 4" length ensures uniform stress distribution across the entire fastener, preventing loosening under dynamic loads while the external hex drive accommodates standard wrenching tools for efficient field service.

Specification Summary & Compliance

This 5/8"-11 UNC hex head screw maintains precise Class 2A thread fit tolerances with right-hand thread direction and coarse thread spacing. Manufactured to ASME B18.2.1 dimensional standards and SAE J429 material specifications, ensuring consistent quality and performance. The fastener features a 15/16" hex head width and 27/64" head height for proper tool engagement. Compliance with industry standards guarantees mechanical properties including 150,000 psi tensile strength and proper heat treatment verification for Grade 8 classification.