S-92620A826 5/8"-18 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity - Grade 8 classification and 150,000 PSI tensile strength ensure reliable performance in the most demanding heavy-duty applications
• Superior Corrosion Protection - Zinc yellow-chromate plating provides enhanced resistance to rust and environmental degradation in industrial settings
• Precise Thread Engagement - Class 2A thread fit guarantees consistent, secure fastening with reduced risk of cross-threading or stripping
• Optimized Torque Transmission - External hex drive design allows for high torque application and secure installation with standard tools
• Enhanced Fatigue Resistance - Rockwell C33 hardness rating ensures durability and maintains structural integrity under vibration and dynamic loads
• Full Thread Coverage - Complete threading along the 2½" length provides maximum grip strength and uniform stress distribution
• Industry Standard Compliance - Manufactured to ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value through its high-strength steel construction and UNF fine threading, specifically designed to address critical industrial challenges. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides reliable performance in heavy machinery, structural steel connections, and high-vibration environments where fastener failure is not an option. The zinc yellow-chromate plating offers superior corrosion resistance, extending service life in harsh industrial conditions while maintaining dimensional stability. The Class 2A thread fit ensures precise engagement in tapped holes, reducing installation time and preventing costly rework. These fully threaded hex head screws are engineered for applications requiring maximum clamping force and vibration resistance, making them ideal for construction equipment, automotive assemblies, and industrial machinery where safety and reliability are paramount.

Specification Summary & Compliance

This fastener features precision 5/8"-18 UNF fine threading with Class 2A thread fit tolerance for consistent engagement and reliable performance. Manufactured in compliance with ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and mechanical properties. The zinc yellow-chromate plating provides corrosion protection while maintaining the structural integrity of the Grade 8 steel substrate. The external hex drive configuration accommodates standard industrial tools for efficient installation and removal. All materials and processes comply with industry regulations for heavy-duty mechanical fasteners.