Product Details

Our GB 1339 Double Self-locking Nuts are precision-engineered for maximum reliability and performance.

• Advanced Double Self-Locking Mechanism: This is the core feature of the nut. It incorporates a redundant locking system that provides both prevailing torque and mechanical interference. This ensures that even under extreme vibration or thermal cycling, the nut maintains its clamp load and will not back off. This dual-action lock is significantly more reliable than single-locking methods like nylon inserts or simple deformed threads.
• GB 1339 – 1988 Standard Compliance: Manufactured in strict accordance with the Chinese national standard GB 1339, these nuts meet specific dimensional, mechanical, and performance requirements for high-reliability anti-loosening fasteners. This standardization guarantees quality and interchangeability for critical applications.
• High-Strength Alloy Steel Construction: Typically fabricated from high-grade alloy steel (e.g., Class 10.9), these nuts are designed to withstand high tensile stresses and provide immense clamping force. This makes them suitable for securing heavy structural components and high-load machinery.
• Protective Black Oxide Finish: Most commonly supplied with a black oxide finish, which provides moderate corrosion resistance and a low-friction surface. This finish prevents galling during installation and protects the nut in industrial environments. Other coatings can be applied based on project requirements.

Product Parameters

The technical specifications for our GB 1339 Double Self-locking Hex Nuts are outlined below.

Product Features

Our GB 1339 Double Self-locking Nuts are the premier choice for safety-critical fastening.

• Exceptional Anti-Loosening Performance: The double self-locking mechanism provides a secure, vibration-proof connection that far exceeds the performance of standard nuts and single-lock designs.
• High Reliability for Critical Joints: The redundant locking feature ensures that the connection remains secure, preventing catastrophic failure in applications subject to dynamic loads and shock.
• Superior Strength for Heavy Loads: Made from high-strength alloy steel, these nuts can be torqued to high values to achieve the necessary clamp load for structural and heavy machinery applications.
• Designed for Dynamic Environments: Specifically engineered to perform in environments with constant vibration, making them ideal for engines, industrial machinery, and transportation equipment.
• Limited Reusability: All-metal locking nuts can typically be reused a limited number of times, though performance should be verified after each use, as the locking feature may degrade slightly.

Product Applications

The unmatched security of these nuts makes them essential for a wide range of critical and high-vibration applications.

• Heavy Industry and Machinery: Used for mounting heavy equipment, presses, vibrating screens, and other machinery where operational vibration is intense.
• Automotive and Transportation: Ideal for securing critical components such as engine mounts, suspension systems, driveline assemblies, and chassis frames.
• Construction and Structural Engineering: The perfect choice for steel frame buildings, bridges, and other structures that experience dynamic loads from wind, traffic, or seismic activity.
• Railway and Aerospace: Employed in applications where fastener integrity is paramount to safety, such as on rolling stock, track components, and aircraft assemblies.
• Energy Sector: Used in the assembly of wind turbines, generators, and other equipment subject to constant operational vibration.