S-92190A143 1/2"-13 x 2 1/2" ASME B18.2.1, SAE J429 Left-Hand Threaded Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 110,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Left-hand threading provides secure fastening in applications where right-hand rotation could cause loosening, ideal for specific machinery and equipment.
• Grade 5 steel construction with Rockwell C21 hardness offers superior durability and resistance to wear, extending service life in demanding environments.
• Coarse UNC thread design allows for quicker installation and better performance in materials prone to vibration or thermal expansion.
• Class 2A thread fit ensures consistent, precise engagement with mating parts, minimizing assembly issues and improving joint integrity.
• Full threading along the 2 1/2" length provides maximum grip and adjustability, suitable for a wide range of material thicknesses.
• External hex drive design enables easy installation and removal with standard tools, reducing labor time and improving efficiency.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and high mechanical stress. The left-hand UNC coarse threading is specifically designed for applications where standard right-hand threads may unscrew under rotational forces, making it ideal for machinery, automotive components, and heavy equipment. Made from high-strength steel with a Rockwell C21 hardness, it resists deformation and corrosion, ensuring long-term reliability in harsh environments. The fully threaded design and external hex drive simplify installation, reducing downtime and maintenance costs. Whether used in assembly lines, construction, or manufacturing, this fastener delivers consistent performance, meeting the demands of industrial applications that require robust, left-hand threaded solutions.

Specification Summary & Compliance

This screw features precise Class 2A thread fit per UNC standards, ensuring accurate and secure fastening. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional consistency and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental compliance for global industrial use.