Locknuts, also known as lock nuts, are a kind of fasteners. They are nuts that designed for fastening bolts on materials to against loosen causes from vibration and torque.
Usually, nuts are made of stainless steels, not except the locknuts. There is a layer of special chemical, usually nylon, smeared on the top inside of a nut. This chemical coat inside the locknut will help to grab the bolt tightly.
When fastening the lock nut, strong friction would be produced by great reacting force. Thus, this force provides huge resistance to vibration and then links the nut and bolt.
The idea of locknuts popped up few decades ago in America. The inventors add a 30-degreed bevel face with threads topped on the 60-degreed threads.
Since the angle of the threads has been changed, the friction used to prevent losing would be enhanced. Thus, the threads of both the nut and the bold would grab each other tightly.
Moreover, the traditional nuts would have a problem that the pressure would focus on the first one or two threads and cause a broken. However, with the design of changing bevel face, numbers of the broken have been reduced. In addition, lifespans of the lock nuts are longer.
Later, people found out that the grip of locknuts could be improved by material with high friction. Therefore, nylon has been added inside the lock nuts and make them powerful to fasten the bolt.
Due to their features, locknuts are now the most reliable fasteners for loosen prevention products. Moreover, they are reusable. If using them properly, the lock nuts could be installed and removed approximately for 50 times.
In addition, they are now widely applied in various kinds of industries. From the skyscrapers to our smartphones, locknuts could be found.
At first, the lock nuts are mainly used in aerospace engineering. By the improvement of producing technique and the reducing of costs, locknuts were then used by automobile manufacturers.
Now, since the costs has been lower and the improvement has been progressed, locknuts are also adopted in bicycle, skiing equipment, sport equipment, furniture, medical equipment and even 3C manufacturing industries.
As a kind of fasteners, the lock nuts are undeniably one of the strong one. However, even the giant can be defeated by a teen.
Although locknuts have great features, they are not immortal that would have some shortages.
1. Excellent Anti-Vibration
The normal force, the force that surfaces exert to prevent solid objects from passing through each other, of locknuts are much more powerful than normal nuts.
Thus, the friction and the normal force could make the lock nuts and bolts linking closer and tighter. In the end enhance the capacity of anti-vibration.
Since anti-vibration is linked to security, it is a serious issue on buildings and public utilities. Thus, the fastener used on the buildings must be strong and durable.
Therefore, plus the feature of made of stainless steel, the feature, strong anti-vibration, has been the main reason why locknuts are widely used by construction industries.
2. Durable for Wear and Tear
The 30-degreed bevel face with threads on the locknuts make the pressure of torque averagely put on each thread. With this ability, there would not be the situation of the whole torque are bear by only one or two threads.
Plus, since the locknut are under the protection of its own feature of anti-vibration, it will not shake and produce extra friction to cause wear and tear.
Thus, the threads would have less probability to broken. Then, the lifespan of locknuts would be extended.
3. Longer Lifespan
The features above are focus on the stainless steel part of the locknuts. However, the nylon part is also important for fastening.
In our common sense, materials look like rubber could be defeated by time. However, the nylon ring inside a locknut are strong enough to against weathering.
Therefore, combine with these three features, anti-vibration, durable, and capacity to against weathering, a locknut can be stronger and get longer lifespan than the normal nut.
4. No Need to Use Washers
The function of washers is helping to make fasteners tighter. Therefore, washers are not necessary since their functions could be replaced by the locknuts.
1. Cannot Be Used in Extreme Environments
Extremely high or low temperatures might damage the locknuts.
The temperature a locknut can bear is between minus 50 Celsius degrees to 200 Celsius degrees.
Temperature that over this area are defined extremely high or low temperatures to the locknuts.
2. Cannot Be Treated with Electroplating
Electroplating would leave some remains on the nylon coat. They would cause a damage on the nylon coat and break the structure of thread.
Therefore, it is not suggested to electroplate anything on the locknuts.
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