By Howmet Fastening Systems Industrial

Simmonds Nylstop nuts are a type of self-locking nut known for their reliability and resistance to vibration. Invented in 1936, they've become a popular choice across various industries due to their unique design and performance characteristics. Let's delve into the world of Nylstop nuts and explore what makes them so effective.

How Does a Nylstop Nut Achieve Self-Locking?

The secret to the Nylstop nut's success lies in its internal nylon ring. This ring inserts into the threads of the nut and deforms slightly as you tighten it onto the bolt. This deformation creates a tight grip that resists loosening due to vibration or impact.

Where Can You Use Nylstop Nuts?

Nylstop nuts are ideal for applications where vibration is a constant concern. Here are some common examples:

  • Automotive engines and transmissions
  • Aerospace components
  • Heavy machinery
  • Consumer electronics
  • Appliances

Using a Nylstop Nut: Simple and Efficient

Nylstop nuts are easy to use. Simply thread them onto the bolt like a standard nut and tighten them to the desired torque specification. No additional parts or lockwashers are needed, making installation efficient.

How Many Times Can You Reuse a Nylstop Nut?

The nylon ring can withstand wear and tear, allowing Nylstop nuts to be reused up to 5 times. However, it's crucial to inspect the nut for any damage or excessive wear before reuse.

Advantages of Simmonds Nylstop Nuts

  • Vibration resistance: The nylon ring's tight grip ensures the nut stays secure even under extreme vibration.
  • Reusability: Up to 5 re-use cycles make Nylstop nuts a cost-effective option.
  • Cost-effective: The simple design eliminates the need for additional locking mechanisms, reducing overall assembly costs.
  • Chemical resistance: The nylon ring offers good resistance to common chemicals.
  • Temperature resistance: Depending on the specific type, Nylstop nuts can withstand temperatures up to 120°C.
  • Corrosion resistance: The materials coatings used in Nylstop nuts offer good corrosion resistance.
  • Material quality: Simmonds Nylstop nuts are known for their consistent high quality, ensuring reliable performance.


Simmonds Nylstop nuts offer a robust and user-friendly solution for applications where vibration resistance and ease of use are critical. Their reusability and cost-effectiveness make them a popular choice for various industries. If you're looking for a reliable nut that can withstand demanding environments, consider Simmonds Nylstop nuts for your next project.

If you'd like to contact us about using Simmonds Nylstop nuts in your project or application, please contact us