S-92620A829 5/8"-18 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 capability with 150,000 psi tensile strength for reliable performance in high-stress environments
• Superior corrosion resistance through zinc yellow-chromate plating that extends service life in demanding conditions
• Precision thread engagement with Class 2A fit ensuring consistent installation and vibration resistance
• Maximum hardness durability at Rockwell C33 for maintained thread integrity under repeated use
• Optimized torque transmission via external hex drive and 15/16" head width for secure tightening
• Full-threaded design providing complete engagement along the 4" length for uniform stress distribution
• Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality verification

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The 5/8"-18 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, construction equipment, and transportation systems. The zinc yellow-chromate plated steel construction addresses corrosion challenges in outdoor or chemically aggressive environments, while the fully threaded design ensures maximum grip length for load distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners prevent thread stripping and maintain clamp force in high-vibration scenarios, making them ideal for critical connections in manufacturing infrastructure, heavy equipment assembly, and structural steel applications where failure is not an option.

Specification Summary & Compliance

This 4" hex head screw features precision Class 2A thread fit with 5/8"-18 UNF fine threads in right-hand direction. Manufactured to ASME B18.2.1 dimensional standards and SAE J429 Grade 8 mechanical properties, ensuring consistent quality and performance. The fastener meets industry standards for inch system measurements and provides reliable compliance for engineering specifications requiring verified mechanical properties and dimensional accuracy.