S-90211A368 5/8"-11 x 3" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Left-hand UNC coarse threading offers specialized functionality for applications requiring reverse-thread engagement, preventing unintentional loosening.
• Fully threaded design allows for maximum grip and load distribution along the entire 3" length, improving joint stability.
• High hardness (Rockwell C33) and Grade 8 classification ensure durability and resistance to wear under heavy loads.
• External hex drive facilitates easy installation and removal with standard tools, streamlining maintenance and assembly processes.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in demanding industrial settings, such as machinery, construction, and automotive assemblies. Its left-hand UNC coarse thread is specifically designed for applications where standard right-hand threads may loosen due to rotational forces, providing a secure fastening solution. The zinc yellow-chromate plating combats corrosion in exposed or humid conditions, significantly reducing downtime and replacement costs. With a 150,000 psi tensile strength and Rockwell C33 hardness, it withstands extreme loads and vibrations, ensuring long-term reliability. Fully threaded and compliant with SAE J429, this screw delivers consistent performance in heavy-duty fastening tasks, making it ideal for engineers prioritizing safety and durability.

Specification Summary & Compliance

This product adheres to inch system measurement with a thread size of 5/8"-11 UNC, Class 3A thread fit for precision, and a length of 3". It meets SAE J429 specifications for Grade 8 fasteners, ensuring consistent quality and performance. The zinc yellow-chromate finish provides environmental protection, while the material and manufacturing processes comply with industry standards for high-strength applications.