The Structure and Function of K-Type Nuts

A K-type nut, also known as a K cap or serrated nut, is a special type of nut with the primary purpose of locking and preventing loosening [3]. The distinguishing feature of a K-type nut is the inclusion of a movable serrated washer at one end of a hexagonal nut, achieved through a stamping process [8]. During the tightening process, the elasticity of the serrated washer and the serrations themselves provide the locking and anti-loosening effect [3]. K-type axial precision lock nuts achieve fastening of components through the principle of self-frictional locking. As the nut is rotated, friction is generated between the threads and the component, resulting in radial forces that secure the component in place.

K-type nuts typically exhibit the following structural characteristics:

 

1. **Appearance:** K-type nuts have a K-shaped appearance. When viewed from the side, their outline resembles the letter "K," hence the name.

 

2. **Internal Threads:** The interior of K-type nuts contains threads for compatibility with screws or bolts.

 

3. **Two Openings:** K-type nuts have two openings, typically semi-circular in shape, making it easy to grip or release bolts or screws.

 

**Function:**

 

The primary function of K-type nuts is to provide an effective means of clamping or locking bolts or screws to prevent them from loosening or coming undone. Specifically, their functions include:

 

1. **Locking:** K-type nuts are commonly used in applications requiring additional locking force. Their structural design ensures that, during tightening, the nut clamps onto the bolt or screw, providing extra resistance and reducing the risk of loosening. This is particularly crucial for components subjected to frequent vibrations or external forces.

 

2. **Convenient Installation:** Due to having two openings, K-type nuts are relatively easier to install and remove compared to traditional hexagonal nuts, without the need for complete nut removal.

 

3. **Reduction of Thread Wear:** Since K-type nuts provide additional frictional force, they can reduce thread wear, thereby extending the lifespan of bolts or screws.

 

In summary, K-type nuts are highly useful in applications where secure fastening and reduced risk of loosening are essential. They offer a reliable locking mechanism, contributing to the stability and safety of mechanical components.