S-92620A557 1/4"-20 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 Grade 8 classification and 150,000 psi tensile strength for critical structural applications
• Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
• Optimized thread engagement with Class 2A fit and coarse UNC threading for faster assembly and reduced cross-threading risk
• Exceptional durability backed by Rockwell C33 hardness to maintain integrity under repeated stress and vibration
• Full-length threading ensures consistent grip strength along the entire 5" shaft for maximum fastening security
• Standard-compliant design meeting ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
• Efficient installation with external hex drive and 7/16" head width for high-torque application with standard tools

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where failure is not an option. The steel construction with Rockwell C33 hardness provides exceptional resistance to shear and tensile forces in heavy machinery, structural steel connections, and industrial equipment. The zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor or chemically aggressive environments, significantly extending service life. With coarse UNC 1/4"-20 threading and Class 2A fit, these fully threaded fasteners offer rapid installation in structural steel, construction frameworks, and manufacturing equipment where vibration resistance and reliable clamping force are paramount. The external hex drive design accommodates high torque requirements while the 5" length provides ample engagement for thick material assemblies.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) for optimal performance in industrial applications. These hex head screws comply with ASME B18.2.1 dimensional standards and SAE J429 material specifications, ensuring mechanical properties meet Grade 8 requirements including 150,000 psi tensile strength and Rockwell C33 hardness. The zinc yellow-chromate plating provides corrosion resistance while maintaining compliance with industry standards for heavy-duty fastening applications.