S-92620A657 3/8"-24 x 5/8" 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 provided by zinc yellow-chromate plating, extending service life in demanding environments
• Precise thread engagement with UNF fine threading and Class 2A fit ensures secure fastening and vibration resistance
• Maximum torque transmission through the external hex drive design and 9/16" head width for easy installation
• Consistent hardness properties with Rockwell C33 rating maintains structural integrity under repeated stress
• Full-length threading offers versatile fastening options across the entire 5/8" length
• Industry-standard compliance with ASME B18.2.1 and SAE J429 specifications guarantees interchangeability and reliability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for industrial applications where high tensile strength and corrosion resistance are paramount. The steel construction with zinc yellow-chromate plating provides exceptional protection against environmental degradation, while the UNF fine threading with Class 2A fit ensures precise engagement that resists loosening under vibration - a common challenge in machinery, automotive, and heavy equipment applications. The external hex drive design combined with the substantial 9/16" head width allows for high torque application during assembly, making these fully threaded fasteners ideal for critical joints in structural frameworks, engine components, and industrial machinery where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides the durability needed for repeated disassembly and reassembly in maintenance operations.

Specification Summary & Compliance

This 3/8"-24 hex head screw features precision Class 2A thread fit with UNF fine threading standards, manufactured to exact ASME B18.2.1 and SAE J429 Grade 8 specifications. The fastener maintains dimensional accuracy across all critical parameters including 5/8" length, 9/16" head width, and 1/4" head height. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global industrial markets while meeting the stringent requirements for heavy-duty mechanical applications.