S-99891A100 1/4"-20 Hex Nuts

Key Features & Benefits at a Glance

• Maximum strength and reliability with Grade 8 classification, ensuring superior performance in high-stress and heavy-duty applications.
• Enhanced corrosion resistance provided by the zinc yellow-chromate plating, extending service life in harsh industrial and automotive environments.
• Secure and precise fit due to the Class 2B thread fit, minimizing the risk of loosening under vibration and dynamic loads.
• Left-hand threading for specialized applications requiring reverse-thread security, such as rotating machinery and specific assembly setups.
• Coarse UNC thread design allows for quicker assembly and disassembly, reducing installation time and labor costs.
• Standard external hex drive enables easy installation with common wrenches, facilitating efficient maintenance and repairs.
• Durable steel construction combined with protective plating ensures long-term durability and consistent performance under demanding conditions.

Professional Applications & Engineering Value

This Grade 8 heavy-duty left hand hex nut is engineered to address critical challenges in industrial and mechanical systems where standard right-hand threads are insufficient. Its zinc yellow-chromate plated steel construction provides robust corrosion resistance, making it ideal for automotive, machinery, and outdoor equipment exposed to moisture and chemicals. The 1/4"-20 UNC coarse thread and left-hand direction are specifically designed for applications involving counter-rotational forces, preventing unintended loosening in components like shafts, spindles, and rotating assemblies. By ensuring a reliable Class 2B thread fit, this nut maintains clamping force under vibration, reducing maintenance downtime and enhancing operational safety in demanding environments.

Specification Summary & Compliance

This hex nut features a 1/4"-20 UNC coarse thread with Class 2B thread fit for precise dimensional accuracy, manufactured to Grade 8 strength standards. It complies with industry specifications for inch-system fasteners and is constructed from zinc yellow-chromate plated steel, meeting RoHS and REACH environmental directives for safe use in various industrial applications.