Basic thread fasteners connecting locking method is divided into three basic types:

 

A. Do not remove the locking

 

This is a kind of the weld, binding or blunt point riveting will change for the removable threaded connections shall not remove the threaded connection locking method, the traditional method of locking is a very reliable. The downside is threaded fasteners can't reuse. And trouble operation. Commonly used in some reliable locking demanding and does not need to remove one of the important occasions.

 

 

 

 

B. Mechanical locking of fixed

 

Using mechanical fixed between the screws, and the fitting or thread and thread parts between fixed and pin, loose to stop. The advantage of this approach is locking is reliable, its reliability generally depends on the mechanical locking fixed pieces (or fasteners itself, such as slot nut) in the static strength and fatigue strength. Its shortcoming is to increase the weight of the fastening, manufacture and installation of trouble, cannot be installed, so the cost is higher. Due to its locking high reliability, in mechanical products and some important parts are still widely used in aerospace products.

 

C. The locking of friction increases

 

With increasing screw or bolt (screw) head and end of the nut friction or at the same time increase the friction of the two methods to achieve the purpose of locking. The locking method than the reliability of the above category a or b class methods to less, but its the biggest advantage is not limited by the use of space, can be repeated many times, the installation can be motor assembly, and some of the fasteners (such as nylon lock nut, all metal lock nut), the locking reliability has reached a very high level. Therefore, the locking method in the field of mechanical manufacturing and aerospace is the most widely used.