S-90002A111 5/16"-18 x 1 1/2" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 PSI ensures reliable performance in high-stress applications, preventing fastener failure under heavy loads.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, reducing maintenance and replacement costs.
• High hardness rating (Rockwell C33) provides excellent wear resistance and durability, maintaining structural integrity over time.
• Coarse UNC threads with Class 2A fit enable quick and secure installation, minimizing cross-threading risks and assembly time.
• Full threading along the entire 1 1/2" length offers maximum grip and adjustability in various material thicknesses.
• External hex drive design allows for high torque application with standard tools, ensuring tight and secure fastening.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability in professional applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial environments where failure is not an option. The steel construction combined with 150,000 PSI tensile strength and Rockwell C33 hardness provides critical resistance to vibration, shock loads, and fatigue in machinery, structural frameworks, and heavy equipment assembly. The zinc yellow-chromate plating delivers superior corrosion protection, making it ideal for outdoor applications or humid conditions where rust compromises fastener integrity. With its 5/16"-18 UNC coarse threads and Class 2A fit, installation becomes faster and more reliable, reducing assembly errors in production lines. These screws are particularly valuable in construction, automotive manufacturing, and industrial machinery where high-strength bolts must maintain clamping force under extreme operational stresses.

Specification Summary & Compliance

This fastener features precise Class 2A thread fit with 5/16"-18 UNC coarse threads and right-hand thread direction. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product meets industry standards for heavy-duty applications and conforms to RoHS and REACH environmental regulations.