What is self-locking bolt?

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May 20, 2024


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Self-Locking bolt is a kind of fastener that is thoughtfully designed to prevent loosening under vibration or torque.

The bolt has a special locking system like nylon insert or deformed threads that increased the grip and maintains tension. The specialized design helps to prevent the possibility of unintentional loosening even in high-vibration applications.

What are the examples of Self-Locking bolts?

Some of the examples of self-locking bolt are place bolts, APP place bolt, B Place bolt, BH Place bolt, and locking patches.

What is the working principle of Self-locking bolts?

The self-locking bolt works by incorporating a locking mechanism that prevents it from loosening under vibrations or dynamic loads. One common type uses a nylon insert that is inserted into the thread.

When the bolt is screwed into the nut, the threads cut into the nylon, creating friction that holds the bolt in place. The friction increases the resistance to loosening ensuring the bolt remains secure even under conditions of movement or vibration.

also read: What are the five basic types of Fasteners?

Another type of self-locking bolts features distorted threads. These threads are designed to create an interference fit, where the threads of the bolt and nut are slightly mismatched. As the bolt is tightened, the deformed threads create an additional friction, and resistance to loosening. This method is effective in high-vibration environments, minimizing the likelihood of the bolt backing out over time.

What are the benefits of self-locking bolts?

These bolts offer many benefits making them a valuable choice for many applications-

  • Increased security: Self-locking bolts provide increased resistance to loosening under vibrations and dynamic loads. This makes them ideal for use in environments where movement or vibration is common ensuring that the bolted connections and secure.
  • Maintenance reduction: The self-locking bolts are less likely to loosen over time; they reduce the need for regular maintenance and re-tightening. This can lead to significant time and cost savings, particularly in industrial and mechanical applications.
  • Safety improvements: Self-locking bolts prevent unintentional loosening and thus they enhance the overall safety of the assembly. This is important in critical applications like aerospace, construction and automotive where loose bolts can lead to disastrous failures.
  • Durable and Reliable: The locking mechanism of these bolts ensures consistent and reliable performance over a longer period. The durability makes them suitable for long-term applications where reliability is important.
  • Versatility: Self-locking bolts are available in various sizes and types including those with nylon inserts or deformed threads. Their variety allows them to be used in varied applications from household appliances to heavy machinery.

What are the applications that use self-locking bolts frequently?

Self-locking bolts have wide range of applications and are used in all kinds of industries-

  • Automotive industry
  • Aerospace Industry
  • Construction
  • Machinery and Equipment
  • Electronics
  • Marine industry
  • Railways
  • Wind Turbines
  • Mining Equipment
  • Medical Devices

Self-locking bolts provide great resistance to loosening under vibration and dynamic loads, ensuring secure and reliable connections. Their use minimizes maintenance needs and enhances safety across various critical applications.


What are self-locking bolts?

They are fasteners designed to resist loosening under vibrations and dynamic loads by incorporating a locking mechanism.

What are the applications of self-locking bolts?

They are used in automotive, aerospace, machinery, construction, electronics, marine, wind turbines, mining equipment, and medical devices.

What are the benefits of using self-locking bolts?

Self-locking bolts boost security, minimize maintenance, improve safety, offer durability, are easy to use, have unmatched vibration resistance and provide versatility.