S-92620A815 5/8"-18 x 1" 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 for reliable performance in high-stress applications
• Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
• Precise thread engagement with Class 2A thread fit ensuring consistent installation and vibration resistance
• Maximum thread contact through full threading along the entire 1" length for enhanced grip and distribution of stress
• Optimized for heavy-duty use with Rockwell C33 hardness providing excellent wear resistance and durability
• Easy installation and removal with external hex drive design allowing standard wrench access in confined spaces
• Fine thread spacing advantage offering better adjustment precision and superior resistance to loosening under vibration

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for industrial applications where failure is not an option. The combination of high-strength steel material and zinc yellow-chromate plating addresses two primary concerns in industrial fastening: structural integrity and environmental durability. The 5/8"-18 UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, making it ideal for machinery, heavy equipment, and structural assemblies subjected to dynamic loads. The fully threaded design ensures maximum engagement in tapped holes or with nuts, distributing clamp load evenly across the entire fastener length. These characteristics make it particularly valuable in automotive, construction, and manufacturing applications where reliable fastening solutions must withstand extreme conditions while maintaining precise alignment and connection integrity.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerances according to UNF standards, ensuring consistent mating with corresponding nuts and tapped holes. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance requirements. The fastener meets critical regulatory standards including RoHS 3 (2015/863/EU) compliance for restricted hazardous substances and REACH (EC 1907/2006) compliance for chemical safety, making it suitable for global industrial supply chains with stringent environmental requirements.