S-99891A180 7/8"-9 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 steel construction, 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 left-hand UNC coarse threading (7/8"-9) for secure fastening in specialized applications where reverse rotation is required.
• Consistent fit and easy installation with Class 2B thread fit, reducing assembly time and minimizing cross-threading risks.
• Robust external hex drive design allowing for high torque application with standard tools, enhancing grip and usability.
• Heavy-duty dimensions (1 5/16" width, 3/4" height) providing a substantial bearing surface for improved load distribution.
• Wide compatibility with inch-system components, making it ideal for machinery, automotive, and construction uses.

Professional Applications & Engineering Value

This Grade 8 hex nut is engineered to address critical challenges in demanding industrial settings, such as vibration-induced loosening and environmental degradation. The left-hand UNC coarse thread design is specifically tailored for applications where standard right-hand threads may unscrew under rotational forces, such as in certain machinery shafts or mixing equipment. Made from high-strength zinc yellow-chromate plated steel, it combats rust and corrosion, ensuring long-term reliability in exposed or humid conditions. The external hex drive facilitates quick and secure tightening with common wrenches, reducing installation errors and maintenance downtime. Ideal for heavy-duty fastening in construction, automotive, and manufacturing, this nut delivers consistent performance where safety and durability are paramount.

Specification Summary & Compliance

This hex nut adheres to UNC coarse thread standards with a 7/8"-9 thread size and Class 2B thread fit for precise dimensional accuracy. It meets Grade 8 strength specifications, ensuring high tensile and proof load capabilities. The product complies with industry standards for inch-system fasteners and is manufactured to support RoHS and REACH environmental directives, providing a safe and reliable component for various engineering applications.