S-91236A972 1/2"-13 x 18" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 60,000 psi ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc plating extends the screw's service life, even in harsh or outdoor environments.
• Coarse UNC thread and Class 2A fit provide faster installation and easier alignment, saving valuable assembly time.
• External hex drive and hex head design allow for high-torque tightening with standard tools, ensuring a secure and robust connection.
• Partially threaded shank offers an unthreaded section for precise clamping, preventing joint loosening under vibration.
• Compliance with major standards including ASME B18.2.1 and ASTM A307 guarantees consistent quality and dimensional accuracy.
• Rockwell B69 hardness provides excellent durability and resistance to wear, maintaining integrity over repeated use.

Professional Applications & Engineering Value

This 1/2"-13 UNC hex head screw is engineered to solve critical challenges in heavy-duty industrial applications, such as structural steel framing, machinery assembly, and large-scale construction projects. The steel construction combined with a zinc plated finish offers robust protection against corrosion, which is essential for outdoor or high-moisture environments. The coarse thread and Class 2A thread fit ensure quick and secure fastening, reducing installation errors and labor costs. Its 18-inch length and partial threading provide optimal grip and clamping force, making it ideal for applications where vibration resistance and joint stability are paramount. This external hex drive fastener delivers reliable performance in demanding scenarios, from manufacturing plants to infrastructure development.

Specification Summary & Compliance

This product adheres to Class 2A thread fit tolerances and the UNC coarse thread standard, ensuring precise and consistent threading. It is manufactured in compliance with ASME B18.2.1 and ASTM A307 specifications, guaranteeing dimensional accuracy and mechanical properties. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety and sustainability for industrial use.