Security bolts, bolts, and nuts belong to the world of fasteners in general and locknuts is a category within this description. There are many vendors offering nuts and bolts in Melbourne for varying needs and applications. The locknut is designed to resist loosening due to torque and vibrations. Locknuts made of specialty material is an ideal solution for several applications in extreme environments. To prevent failure in actual use conditions they combine unique properties of secure locking and specialty materials.
Among various lock nut styles, prevailing torque lock nuts are more common. This variant of lock nut comes with the prevailing torque feature to deform elastically and prevent free spin as it happens with standard nuts. Within this category of lock nuts flexloc and polymer, insert locknut are very reliable and common among users. The flexloc nut offers an all-metal composition with a segmented collar creating 6 ‘locking fingers’ acting as a spring. The polymer insert variant is also referred to as nylon insert nuts though a range of high-performance polymers such as PVDF can also be used for screw threads. Both the variants are also available in 12 point and hexagonal configurations.
Deployment of these variants is explained below:-
All metal Flexloc Style
This variant among bolts and nuts is ideal for high-temperature environs and the load is evenly distributed since it is manufactured as a single solid piece. It is also the most reliable among all-metal variants of self-locking nuts. The all-metal feature of this nut makes it highly adaptable for corrosive and high-temperature applications.
Nylon/polymer insert lock nut
While this is generally the most reliable variant among lock nuts, it comes with a limitation of temperature due to the presence of polymers. Therefore, this variant is typically best suited for temperatures less than 350oF. The polymer inserts are available in various types like Vespel, PVDF, and Nylon etc. This type of lock nuts also offers excellent reusability. You can also physically examine these and other variants of lock nuts with many vendors of nuts and bolts in Melbourne.
Definition of a nut
A nut represents a fastener with a threaded interior that is circular and used with a bolt for securing several objects in place. After the bolt is inserted through the material to be held together, a nut is twisted to the end of the bolt and tightened. But, in practice, traditional nuts loosen with continuous use. The vibration of the objects that are fastened together is the main cause for the nuts to loosen. Rarely though, this can be seen in certain automobiles when the wheels come off even as the vehicle is cruising along.
The locknut is also known as stiff nut and represents a special type of nut that is designed to prevent loosening even when there is significant vibration. In the olden days, two nuts were often used in conjunction when major vibration was expected. While this is still a practical solution, in large manufacturing processes, it is not a cost-effective option. If two nuts are employed instead of one and there are several such instances across the production line, the number of additional nuts used rises exponentially at the end of the day and jacks up the cost of the product.
Locknuts were introduced for the first time in 1930 and are an easier and cost-effective solution to protect from loosening on account of vibration. Thus manufacturing companies can use just one nut without the concern of loosening from vibration. Further, generally, the lock nuts are not ‘free-spinning’ since they need more than manual force to twist and remove. Therefore, they remain secure and stable on the bolt even when there is significant vibration.
For those who have done some basic DIY tasks or worked with wheels on an automobile or other engines, nuts and washers will be familiar and understand how they are used to fasten bolts. They will also know the impact of vibration on these nuts and washers and the consequent concerns. Though these are mighty small components, by design they perform a very important duty to grip the bolt heads in place preventing any impact from vibration.
Coated lock nut
Corrosion is a serious concern for many industries and users alike. Many nations lose trillions of dollars to corrosion year after year despite all the technological advancements we have been experiencing. But, thankfully, in the case of fasteners of varying descriptions, different materials, and chemical compounds have been formulated to reduce the impact of acidic exposure. Through methods like plating and coating locknuts and equipment are able to withstand corrosion extending the durability of such treated components. Nevertheless, plating and coating do not work like one size fits all and choosing proper coating is important.
Understanding the exposure level to various corrosive elements in a given environment and how much your lock nuts can withstand those elements is important while choosing the type of coating. Chemicals, moisture, and water are the major sources of corrosion and each of them may require coating specifically answering a given condition. In today’s digital world you can find adequate resources to understand what kind of coating suits your end applications best. Nevertheless, you must consider the cost of coating materials, installation issues with regard to coating thickness, problems caused by oversized threads in fitting correctly, and corrosion resulting from dissimilar materials and metals.
To understand how different coating materials react under specific circumstances governing your application, you may also want to test the material in a salt spray chamber which will give you a better idea of corrosion resistance to the particular coating material.