S-90002A115 3/8"-16 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

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 through zinc yellow-chromate plating that protects against harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and easy installation
• Maximum hardness durability featuring Rockwell C33 hardness for extended service life under repetitive stress
• Full-threaded design providing consistent clamping force along the entire 1¼" length for uniform load distribution
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance in critical applications
• Enhanced drive efficiency with external hex head design allowing high torque application without stripping

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance advantages for heavy-duty industrial applications where failure is not an option. The steel construction combined with zinc yellow-chromate plating creates a robust barrier against corrosion in demanding environments such as manufacturing equipment, structural assemblies, and automotive systems. The 3/8"-16 UNC coarse thread configuration provides superior resistance to vibration loosening while maintaining easy installation in various materials. With fully threaded design and external hex drive, these fasteners ensure maximum thread engagement and reliable torque transmission, solving common challenges of joint integrity in high-vibration settings. The combination of 150,000 psi tensile strength and Rockwell C33 hardness makes these screws ideal for critical connections in machinery, construction, and transportation equipment where mechanical reliability is paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. These hex head screws feature 3/8"-16 UNC coarse threads and comply with ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and reliability across industrial applications. The zinc yellow-chromate plating provides enhanced corrosion protection while maintaining the mechanical properties required for Grade 8 strength classification.