S-91251A628 3/8"-16 x 1 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish prolongs service life in demanding industrial environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal play.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Fully threaded UNC coarse design allows for faster installation and superior grip in a wide range of materials.
• 5/16" hex drive compatibility offers easy installation with standard tools, reducing assembly time and effort.
• Compliance with ASTM A574 ensures consistent quality and mechanical properties for critical applications.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address common industrial challenges such as joint loosening under vibration and corrosion in harsh environments. The black-oxide alloy steel construction combined with a Rockwell C37 hardness provides a robust solution for machinery, automotive, and heavy equipment assemblies where high-strength fasteners are critical. The UNC coarse thread design ensures quick engagement and reliable clamping force, while the fully threaded rod offers uniform stress distribution. Ideal for precision applications requiring Class 3A thread fit, this screw minimizes maintenance needs and enhances operational safety in demanding settings.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances for precise engagement, manufactured in accordance with ASTM A574 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory alignment for global industrial use.