How to maintain and replace fasteners

July 20, 2023

Fasteners are screws, nuts, washers, etc. used to fasten two or more objects. It is widely used in machinery, construction, aviation, automobile and other fields. Due to its important role in machinery, maintenance and replacement become crucial. Below, maijin will show you how to maintain and replace fasteners. 1. How to maintain fasteners Pay attention to the surface cleaning of fasteners: if the surface of fasteners is dirty or corroded, it will affect their fastening performance and life, so keeping the surface of fasteners clean is the Critical. Check the tightening force of fasteners: Due to the variety of working conditions, fasteners need to be inspected at least once a year. This can ensure that the fasteners are not loose or damaged. Fasteners of different materials need to be inspected at different intervals. The use of covering agent: the use of some covering agent can prolong the life of fasteners. For example, Dutch plate material is used to reduce wear between fasteners and machine surfaces. 

Do not reuse partitions: partitions fail to judge their reusability. Some separators may lose their original strength and adhesion after one use, which can lead to wear or pitting of fasteners if forced. Removal of waste material: When performing maintenance and repairs on fasteners, all waste materials need to be removed. If some scrap isn't cleaned out, it could cause it to get caught in the middle of the fastener, causing loosening or other problems. 2. How to replace the fasteners Turn off the equipment: When replacing the fasteners, the equipment must be turned off first. Failure to do so may cause the fastener to become unstable, resulting in erratic equipment operation or an emergency shutdown. Locating fasteners: Find the location of the fasteners that need to be replaced according to the design drawings or instructions of the equipment. Removing the existing fasteners: Use a suitable tool to remove the fasteners that need to be replaced. If they are screws or nuts, they need to be turned counterclockwise until they are completely removed. Replacing new fasteners: When purchasing new fasteners, factors such as their material, model and size need to be considered. Proper installation of fasteners is critical. Improper installation can result in damaged fasteners or unstable equipment. Repeated inspection: After replacing the fasteners, repeated inspections are required. For each fastener, they should be inspected for adequate tightness and for any looseness or corrosion. In short, the maintenance and replacement of fasteners must be carried out. This ensures their tightness and the stability of mechanical components, prolongs the life of fasteners, and improves the safety and reliability of equipment.

Inventory of misunderstandings in using fasteners

Fasteners are a kind of fastener connection parts commonly used in people's daily life, ranging from small screws on watches to large mechanical parts or airport bolts and nuts. The application standard of fasteners is very common, but in the process of our application, will you encounter some misunderstandings, for example, if you don’t have fine-thread bolts, can you use coarse-thread bolts instead? For these problems, Changzhou Wujin Dajia Standard Parts Co., Ltd. reminds us that it is impossible. According to the summary, when using fasteners, the common misunderstandings mainly include the following categories. We look forward to helping you.
Misunderstanding 1 of using fasteners: use coarse threads instead of fine threads There are many key joints on the equipment, such as rotating shafts, etc. Most of the bolts are fine thread external threads. If there are missing parts during maintenance, some maintenance personnel will replace them with coarse thread bolts, which should also be avoided. Due to the large inner diameter of fine thread bolts, small pitch and angle, high strength, good locking performance, and strong ability to bear impact, vibration and interchangeable loads. Once it is replaced by coarse tooth bolts, it is easy to fall off or fall off, break off, and even cause mechanical accidents.
Misunderstanding 2 of using fasteners: The holes are not suitable for the bolts that bear the lateral load and shear stress on the equipment, such as the rotating shaft bolts, water pump flywheel bolts, and their matching with the bolt holes is a clearance fit. The installation should be firm and reliable, and can be used Take side force. Some people do not pay attention to inspection during the installation process, and continue to install when there is a large gap between the bolt and the bolt hole, which is very easy to cause bolt loosening or disconnection accidents.

Misunderstanding 3 of using fasteners: Thickened nuts increase connection reliability Some people incorrectly think that thickened nuts can increase the number of working cycles of external threads and improve the reliability of connections. But in fact, the thicker the nut, the more uneven the load distribution between the threads of each circle, and the easier it is for the joint to loosen.
Misunderstanding 4 of using fasteners: After the successful assembly of one female and multiple pads, sometimes the bolts are too long, so many people install self-locking nuts on the bolts. In this case, the self-locking nut will break due to uneven bearing force during the fastening process, which will reduce the pre-tightening force of the bolt, and may also cause axial load, reducing the reliability of the bolt connection.
Misunderstanding 5 of using fasteners: The tighter the better, many workers have such a misunderstanding: that is, they think that the bolts should be "tighter than soft", so they deliberately increase the tightening torque, resulting in loosening of the bolts. In addition, there are some key bolts that need to be tightened with torque, but some people use an adjustable wrench to tighten them for convenience. As a result, the torque is not enough, causing the bolts to loosen, and even cause equipment failure.

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