S-90211A292 3/8"-16 x 1" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength and Grade 8 classification for heavy-duty industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
• Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under extreme conditions
• Left-hand threading designed for specialized applications where reverse rotation is required
• Easy installation and removal with external hex drive and 9/16" head width for standard tool compatibility
• Industry compliance assurance meeting SAE J429 specifications for quality and performance reliability

Professional Applications & Engineering Value

These Grade 8 hex head screws with left-hand UNC coarse threading are engineered for demanding applications where conventional right-hand threads would loosen under counter-rotational forces. The steel construction combined with zinc yellow-chromate plating provides exceptional protection against corrosion in industrial environments, while the Class 3A thread fit ensures precise engagement that resists vibration-induced loosening. These heavy-duty fasteners are particularly valuable in machinery, automotive, and manufacturing equipment where reverse-thread applications require reliable performance under high stress conditions. The external hex drive design allows for high torque application, making them ideal for assembly lines and maintenance operations requiring efficient installation.

Specification Summary & Compliance

This 3/8"-16 UNC left hand hex head screw features Class 3A thread fit for precision engagement and maintains dimensional accuracy per inch system standards. The fastener complies with SAE J429 specifications for Grade 8 requirements, ensuring consistent performance in industrial applications. Manufacturing follows standardized protocols for coarse thread profiles and fully threaded design, providing reliable fastening performance across various engineering applications while meeting industry quality standards.