S-92865A446 5/8"-18 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that protects against rust and extends service life
• Precise thread engagement with Class 2A fine UNF threading ensuring secure fastening and vibration resistance
• High-strength Grade 5 construction with Rockwell C25 hardness for durability under heavy loads
• Optimal drive efficiency with external hex head design allowing for high torque application and easy installation
• Full threading coverage along the 4-1/2" length provides maximum grip and holding power
• Industry compliance assurance meeting ASME B18.2.1/SAE J429 standards and RoHS 3 environmental regulations

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver exceptional engineering value in heavy-duty industrial applications where failure is not an option. The combination of medium carbon steel construction and zinc plating addresses critical challenges of structural integrity and environmental durability. The 5/8"-18 UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, making these fully threaded fasteners ideal for machinery, structural steel connections, and equipment assembly. The external hex drive design enables high torque application without stripping, while the Class 2A thread fit ensures consistent engagement across multiple installations. These screws solve the engineering dilemma of balancing high strength requirements with corrosion protection in demanding environments.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with UNF fine threading (5/8"-18) and meets ASME B18.2.1 specifications where identified under SAE J429 for Grade 5 fasteners. The manufacturing complies with RoHS 3 (2015/863/EU) regulations, ensuring environmental responsibility. With dimensional accuracy maintained throughout production, these screws deliver reliable performance in industrial applications requiring standardized inch system measurements and certified material properties.