S-90211A350 1/2"-13 x 4 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc yellow-chromate plating, extending the screw's service life in harsh industrial environments.
• High-precision threading with Class 3A fit and left-hand UNC coarse thread, offering secure, vibration-resistant fastening in specialized machinery.
• Optimal durability and wear resistance due to Rockwell C33 hardness, maintaining structural integrity through repeated use.
• Easy installation and removal with a standard 3/4" external hex head, allowing for efficient assembly with common tools.
• Full-threaded design for maximum grip across the entire 4 1/2" length, providing consistent clamping force in thick materials.
• Compliance with industry standards per SAE J429, ensuring quality and interchangeability for professional engineering projects.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in high-stress industrial settings, such as heavy machinery, automotive assemblies, and construction equipment. 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 that resists unintended backing out. The zinc yellow-chromate plating offers a robust barrier against corrosion, reducing maintenance needs in environments exposed to moisture or chemicals. Made from high-strength steel and fully threaded, it ensures uniform load distribution and reliable performance in demanding industrial fastening scenarios, making it an ideal choice for engineers seeking durability and precision.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances with a Class 3A thread fit and UNC coarse thread specification, ensuring tight, reliable connections. It meets the SAE J429 standard for material and mechanical properties, confirming its suitability for high-strength applications. Manufactured in the inch system, it features a 1/2"-13 thread size and 4 1/2" length for consistent performance. The product complies with common industry regulations for quality and safety, though specific RoHS or REACH declarations should be verified per batch. This heavy-duty screw is ideal for professionals requiring certified, high-performance components.