S-90306A340 1/2"-13 x 2 1/2" Left-Hand Threaded 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh environments and reducing replacement frequency.
• Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B70 hardness, ensuring reliable performance under high-stress conditions.
• Secure and precise fit due to the Class 2A thread fit, providing consistent engagement and reducing the risk of cross-threading.
• Enhanced safety in rotating assemblies with the left-hand thread, which prevents loosening in applications where standard right-hand threads might unscrew.
• Efficient installation and removal using the external hex drive and 3/4" head width, allowing for high torque application with standard tools.
• Versatile coarse UNC threading offers quicker assembly and better performance in materials where fine threads are not suitable.
• Compliance with stringent environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This 1/2"-13 UNC Left Hand Thread Hex Head Screw is engineered to address critical challenges in industrial settings where standard right-hand threaded fasteners may fail. The 18-8 Stainless Steel material provides excellent resistance to corrosion and oxidation, making it ideal for use in marine, chemical processing, and outdoor equipment. The left-hand thread is specifically designed for applications involving counter-clockwise rotating machinery, such as certain motors, blowers, and mixer assemblies, where it prevents unintentional loosening. Combined with a coarse thread and fully threaded design, it ensures rapid installation and robust holding power in softer materials or where vibration is a concern. This screw’s external hex drive allows for high torque application, facilitating secure fastening in heavy-duty mechanical systems, thereby reducing maintenance downtime and enhancing operational safety.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 Stainless Steel and is fully threaded with a length of 2 1/2". The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety standards for industrial use.