S-99891A200 1 1/8"-7 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional tensile strength with Grade 8 classification, ensuring reliable performance in high-stress industrial environments.
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh or outdoor conditions.
• Precise and secure thread engagement with Class 2B fit, reducing the risk of loosening under vibration and load.
• Left-hand threading design for specialized applications where reverse rotation is required to prevent unintended disassembly.
• Coarse UNC threads enabling faster assembly and reduced cross-threading in demanding setups.
• Heavy-duty external hex drive for easy installation and removal with standard tools, improving maintenance efficiency.
• Wide compatibility with inch-system components, making it ideal for machinery, automotive, and construction assemblies.

Professional Applications & Engineering Value

This Grade 8 heavy-duty hex nut is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion degradation. The left-hand thread configuration is specifically designed for applications where standard right-hand threads may unscrew due to rotational forces, such as in certain machinery, rotating shafts, or mixing equipment. Made from zinc yellow-chromate plated steel, it offers robust protection against rust and chemical exposure, making it suitable for outdoor construction, agricultural machinery, and marine environments. The coarse UNC threading and Class 2B thread fit ensure quick, accurate mating with bolts, minimizing assembly time and enhancing joint integrity. Ideal for use in heavy equipment, automotive systems, and structural frameworks, this nut delivers long-term reliability and reduces maintenance downtime.

Specification Summary & Compliance

This hex nut adheres to UNC coarse thread standards with a size of 1 1/8"-7 and Class 2B thread fit for precise dimensional accuracy. It meets the requirements for Grade 8 strength classification, ensuring high tensile and yield strength. Manufactured from steel with zinc yellow-chromate plating, it complies with industry standards for corrosion resistance and is suitable for use in applications requiring consistent performance under heavy loads. The product conforms to relevant ASME and ANSI specifications for inch-system fasteners, supporting reliable integration in various industrial assemblies.