S-92620A755 1/2"-20 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability 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 harsh environments
• Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
• Maximum thread coverage through full threading along the 5½" length for enhanced grip and distribution of clamping forces
• Heavy-duty construction meeting Grade 8 standards with Rockwell C33 hardness for durability in demanding industrial settings
• Standard-compliant design adhering to ASME B18.2.1 and SAE J429 specifications for consistent quality and interchangeability
• Optimized drive efficiency with external hex head design allowing high torque application and easy installation

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy-duty industrial and automotive applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures structural integrity under extreme loads, while the zinc yellow-chromate plating provides essential corrosion protection in demanding environments. The 1/2"-20 UNF fine thread configuration offers superior resistance to vibration loosening compared to coarse threads, making it ideal for machinery, equipment frames, and structural assemblies. The fully threaded design along the 5½" length maximizes engagement surface area, distributing stress evenly and preventing point failures. Engineered to ASME B18.2.1 specifications, this fastener guarantees dimensional consistency and reliable performance in critical joining applications.

Specification Summary & Compliance

This heavy-duty hex head screw features precise Class 2A thread fit with UNF fine thread spacing (1/2"-20) and right-hand thread direction. Manufactured from high-strength steel with zinc yellow-chromate plating finish, it complies with ASME B18.2.1 dimensional standards and SAE J429 Grade 8 mechanical properties requirements. The fastener meets industry standards for dimensional accuracy, mechanical performance, and material quality assurance.