S-92190A171 5/8"-11 x 3" ASME B18.2.1, SAE J429 Left-Hand Threaded Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 110,000 PSI ensures reliable performance in heavy-duty applications, reducing the risk of fastener failure under stress.
• Left-hand UNC coarse threading provides secure fastening in specialized assemblies where reverse rotation is required, preventing accidental loosening.
• Grade 5 steel construction with Rockwell C21 hardness offers excellent durability and resistance to wear, extending service life in harsh industrial environments.
• Fully threaded design allows for maximum grip and adjustability along the entire length, simplifying installation in various material thicknesses.
• Class 2A thread fit ensures smooth assembly and disassembly while maintaining precise tolerances for consistent performance.
• External hex drive head enables easy installation with standard tools, reducing labor time and improving efficiency in maintenance and production.
• Compliance with ASME, SAE, RoHS 3, and REACH standards guarantees safety, environmental responsibility, and interoperability in regulated industries.

Professional Applications & Engineering Value

This 5/8"-11 UNC Grade 5 steel hex head screw is engineered to address critical challenges in industrial settings, such as vibration resistance and high-load capacity. The left-hand thread direction is ideal for applications where standard right-hand threads may loosen due to rotational forces, such as in machinery, automotive, and conveyor systems. Made from high-strength steel with a coarse thread pitch, it provides superior holding power in soft materials or where quick assembly is needed. The fully threaded design ensures uniform stress distribution, minimizing the risk of shear failure. With a Rockwell C21 hardness and 110,000 PSI tensile strength, this fastener withstands extreme conditions, reducing maintenance downtime and enhancing operational reliability in construction, manufacturing, and heavy equipment sectors.

Specification Summary & Compliance

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