S-92620A555 1/4"-20 x 4" 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
• Optimized thread engagement through UNC coarse spacing and Class 2A thread fit for secure fastening and easy installation
• Maximum thread coverage with fully threaded design ensuring consistent clamping force along the entire 4" length
• Enhanced drive stability from the external hex head design, allowing for high torque application without stripping
• Premium material strength with Grade 8 steel and Rockwell C33 hardness for superior durability and impact resistance
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures they withstand extreme vibration and shock loads in heavy machinery, construction equipment, and automotive assemblies. The zinc yellow-chromate plating provides superior corrosion protection in outdoor or chemically aggressive environments, significantly reducing maintenance frequency and replacement costs. With UNC coarse threads and Class 2A thread fit, these fully threaded screws offer excellent engagement in both metals and plastics, while the external hex drive accommodates high torque applications without cam-out. Engineered to ASME B18.2.1 and SAE J429 standards, these industrial-grade fasteners provide reliable solutions for structural connections, machinery frames, and heavy equipment maintenance.

Specification Summary & Compliance

This 1/4"-20 x 4" hex head screw features precision UNC coarse threads with Class 2A thread fit tolerance for consistent performance. Manufactured from high-strength steel with zinc yellow-chromate plating finish, the fastener meets rigorous ASME B18.2.1 dimensional specifications and SAE J429 Grade 8 mechanical requirements. The product complies with industry standards for heavy-duty applications and maintains compatibility with standard 7/16" hex wrench sizes. All materials and processes adhere to RoHS and REACH environmental directives.