Self-locking bolts are specially designed fasteners with a built-in locking mechanism that allows them to remain tight without additional locking elements such as locknuts or lockwashers. The main feature of this type of bolt is its ability to resist loosening due to vibration or other external forces, which is particularly important for mechanical connections that need to remain stable in dynamic environments.
By increasing the friction between the threads: Some self-locking bolts increase the friction between the threads of the bolt and the nut by changing the shape of the nut, e.g., by ellipticalizing the threads or by placing a projection on the threads to increase the resistance. This design is often referred to as “self-locking with prevailing torque”, meaning that it provides a consistent torque value regardless of the axial load applied.
Use of positive locking devices: Some self-locking bolts may have special thread designs, such as pits or flanged grooves, which provide additional mechanical locking to prevent accidental loosening of the nut.
Resistance to loosening: due to their self-locking mechanism, self-locking bolts are able to hold tension for a longer period of time than ordinary bolts.
Increased reliability of the connection: self-locking bolts provide additional strength and durability, as well as confidence that the connection will remain tight.
Reduced maintenance: since self-locking bolts are more resistant to loosening, they do not need to be checked and re-tightened as often.
Time and cost savings: Significant time and money can be saved due to the reduced need for maintenance.
Cylinder heads
Flywheels
Flex plates
Ring gears
Oilfield mud pumps
Compressor Mounts
Transmission covers
Factors to consider when selecting self-locking bolts include the torque required, temperature range, type of material, and whether or not they need to be reused. For example, some self-locking bolts may be suitable for use in extreme temperatures, while others may be better suited for use on specific materials. In addition, some self-locking bolts may be designed to be reusable, while others may be more suitable for one-time use.
Self-locking nut is a kind of fastener that can effectively prevent loosening, and is widely used in applications that require resistance to external shocks, vibrations or variable loads. Its working principle mainly relies on friction, through a special design to apply a certain amount of friction on the connecting parts, thus preventing the free rotation and loosening of the nut.
Nylon insert self-locking nut: this kind of nut is structurally embedded with a nylon ring in the head of the nut, and the threads of the bolt will squeeze the nylon ring when it is screwed together, generating friction to achieve the effect of anti-loosening. It is suitable for environments with vibration loads, but the number of times it can be used is limited, and it is usually recommended not to exceed 5 times.
