All Metal Prevailing Torque Locknuts: How It Works, Types & Industries

All Metal Prevailing Torque Locknuts: How It Works, Types & Industries

The torque locknuts are a type of lock nut that features a prevailing torque to assist in preventing self-loosening. The prevailing torque nuts can be divided into two main categories, namely all metal and nylon insert. All metal prevailing torque locknuts get the feature of prevailing torque when the threads are distorted at the top of the nut. On the other hand, the nylon inserts torque prevailing nuts have nylon or any other polymer insert that helps achieve a prevailing torque.

 

All Metal Prevailing Torque Locknuts

 

How do the prevailing torque locknuts work?

The prevailing torque in the locknuts work on three variations such as localized plastic deformation, interference fit, and continuous sliding.

  • In localized plastic deformation, some of the starting threads of the nut need to meet the mating part before the prevailing torque process begins. In case of all metal locknuts, these threads are deflected plastically so that there are different points of interference with the threads of the mating part.
  • In interference fit, the threads of prevailing torque locknut have negative clearance. This means neither there is contact nor deflection with the mating part.
  • In continuous sliding, when the nut is installed the thread surfaces of the locknut and bolt comes in contact as they slide across each other.

Types of all metal prevailing locknuts

  • Collar Locknut – This type of all metal prevailing torque locknut features an oval locking collar. Materials: Steel grade 2-5-8, 2H/DH, monel, brass, bronze, and stainless steel. Finish: Plain, zinc, cadmium, and mechanical galvanized as well as other platings and coatings.
  • Hex Locknut – This type of locknut features deflected threads at the center of the nut. Materials: Steel grade 2-5-8, 2H/DH, monel, brass, bronze, aluminum alloys, and stainless steel. Finish: Plain, zinc, cadmium, and mechanical galvanized, as well as other platings and coatings.
  • Dome Locknut – This type of metal prevailing torque locknut features a dome shape. Materials: Steel grade 2-5-8, 2H/DH, Monel, brass, bronze, aluminum alloys, and stainless. Finish: Plain, zinc, cadmium, and mechanical galvanized as well as other platings and coatings.

Industries where torque locknuts are used

When high temperature, high torque, high vibration, corrosion and tensile strength are involved in any process, industries rely on all metal prevailing torque locknuts. These locknuts are commonly used in these applications:

  • Aerospace / Aviation
  • Turbine Engines
  • Automotive Turbochargers
  • Military Applications
  • High Temperature Applications
  • High Vibration Applications
  • Ship Building Applications

The prevailing torque locknuts can be reused only for a limited number of times because each time the nut is used, there is a decline in its prevailing torque quality. That is why it is recommended to use thread lubricants and torque valves. Because when the nut is used in the long threaded assemblies, it damages the locking feature of the nut as well as the mating part. That is why it is always recommended that the length of the bolt should not be longer if you want to ensure full thread engagement.

TriState Locknuts is a manufacturer and supplier of high quality all metal prevailing torque locknuts. You can order all metal prevailing torque locknuts at wholesale price from us to save money. Contact us today to discuss your requirements.