S-92620A639 3/8"-16 x 4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength and Rockwell C33 hardness for reliable performance in high-stress applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in demanding environments
• Precise thread engagement with Class 2A fit UNC coarse threads ensuring consistent fastening and vibration resistance
• Optimal torque transmission via external hex drive design that prevents tool slippage during installation
• Full-length threading provides maximum grip length and flexibility in various material thicknesses
• Heavy-duty certification meeting ASME B18.2.1 and SAE J429 standards for quality assurance in critical applications
• Industrial-grade durability from high-strength steel construction that withstands extreme mechanical stresses

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value for heavy-duty industrial applications where failure is not an option. The combination of high-tensile steel material and zinc yellow-chromate plating addresses critical challenges in construction equipment, machinery assembly, and structural frameworks by providing both corrosion resistance and 150,000 psi tensile strength. The 3/8"-16 UNC coarse threading with Class 2A fit ensures rapid installation and reliable performance in vibration-prone environments, while the external hex drive design allows for high-torque application without stripping. These fully threaded screws maintain integrity under extreme loads, making them ideal for demanding applications requiring ASME B18.2.1 and SAE J429 compliance.

Specification Summary & Compliance

This hex head screw features precision 3/8"-16 UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufactured from high-strength steel with zinc yellow-chromate plating finish, the fastener meets Grade 8 strength classification requirements per SAE J429 and conforms to ASME B18.2.1 dimensional specifications. The 4" length and fully threaded design provide versatile application coverage while maintaining 150,000 psi tensile strength and Rockwell C33 hardness ratings for industrial compliance.