S-99291A250 7/16"-20 Locknuts

Key Features & Benefits at a Glance

• Reliable Vibration Resistance: Top lock distorted thread design ensures secure locking under dynamic loads, preventing loosening in high-vibration environments.
• Enhanced Corrosion Protection: Zinc yellow-chromate-plated steel finish provides superior resistance to rust and environmental degradation, extending service life.
• Heavy-Duty Strength: ASTM Grade C compliance guarantees high tensile strength and durability for demanding industrial applications.
• Precision Thread Fit: Class 2B thread fit with UNF fine threads (7/16"-20) ensures smooth engagement and consistent clamping force.
• Easy Installation & Removal: Standard external hex drive allows for quick tool access and efficient assembly/disassembly with common wrenches.
• Wide Compatibility: Right-hand UNF thread standard and fine spacing make it ideal for precision machinery and automotive assemblies.
• Cost-Effective Security: Combines reusability with dependable locking performance, reducing maintenance costs and downtime.

Professional Applications & Engineering Value

This 7/16"-20 UNF locknut is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion. The distorted thread technology creates a prevailing torque that maintains clamp load without requiring additional locking devices, simplifying assembly in heavy-duty machinery, automotive systems, and construction equipment. Made from zinc yellow-chromate-plated steel, it withstands harsh environments, while the fine UNF threads and Class 2B fit ensure precise alignment and load distribution. Its external hex drive facilitates efficient installation with standard tools, making it a reliable choice for engineers seeking durability and performance in locking fasteners.

Specification Summary & Compliance

This locknut features a 7/16"-20 UNF fine thread with Class 2B thread fit for accurate engagement and right-hand direction. It adheres to ASTM Grade C strength standards, ensuring mechanical reliability. The manufacturing process follows industry specifications for dimensional consistency, including a standard hex profile (11/16" width, 3/8" height). The zinc yellow-chromate plating offers environmental compliance, typically meeting RoHS and REACH directives for safe use in various sectors.