S-91571A262 5/8"-11 x 1 1/2" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance in the most demanding structural and heavy machinery applications.
• Superior material hardness (Rockwell C19) provides excellent resistance to wear, deformation, and shear forces for long-term joint integrity.
• Coarse UNC thread profile enables faster installation and superior performance in materials like steel and cast iron, reducing assembly time.
• Full threading along the entire 1-1/2" length offers maximum grip and adjustability, accommodating a wider range of material thicknesses.
• High-strength Grade A325 classification guarantees consistent quality and mechanical properties for critical structural connections.
• External hex drive and hex head design allows for high-torque installation with common tools, ensuring a secure, tight fit.
• Compliance with major industry standards (ASME, ASTM) ensures interoperability and reliability in professional construction and industrial projects.

Professional Applications & Engineering Value

This Grade A325 hex head screw is engineered to solve critical fastening challenges in structural steel construction, heavy machinery assembly, and bridgework. The combination of high-carbon steel material and the coarse UNC thread provides superior resistance to vibrational loosening and shock loads, a common failure point in dynamic environments. The fully threaded design ensures that the full 1-1/2" length contributes to clamp load, providing a more uniform stress distribution and preventing joint slippage. This makes it an indispensable component for engineers and contractors who require a high tensile strength fastener that delivers predictable, dependable performance under extreme stress, thereby reducing maintenance costs and enhancing structural safety.

Specification Summary & Compliance

This fastener features a 5/8"-11 UNC thread with a Class 2A thread fit, ensuring dimensional accuracy and easy assembly. It is manufactured in compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to stringent environmental and safety regulations for industrial use.