S-92620A315 5/8"-18 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength for critical heavy-duty applications
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Precision thread engagement with Class 2A fit and UNF fine threads for secure, vibration-resistant connections
• Exceptional hardness at Rockwell C33 to maintain structural integrity under extreme mechanical stress
• Full-threaded design ensuring maximum grip length and uniform load distribution across the entire fastener
• Standard-compliant engineering meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
• Optimized drive performance with external hex head design for high-torque installation and removal

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where failure is not an option. The 5/8"-18 UNF fine threading provides superior resistance to vibrational loosening in dynamic machinery, while the zinc yellow-chromate plating creates a sacrificial barrier against corrosion in industrial environments. Engineered with 150,000 psi tensile strength and Rockwell C33 hardness, these fully threaded fasteners maintain clamping force under extreme loads in construction, heavy equipment, and structural applications. The external hex drive accommodates high-torque installation for secure connections in space-restricted assemblies.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNF fine thread spacing and right-hand thread direction. Complies with ASME B18.2.1 dimensional standards and SAE J429 material specifications for Grade 8 fasteners. The 5-inch length and 0.625" thread diameter maintain consistent dimensional accuracy across production batches for reliable performance in OEM and MRO applications.