As a tool designed for fasteners, the role of a wrench is self-evident. In this issue, we will explore the uses and selections of various wrenches in depth. First, let's take a look at several commonly used wrenches.
01
A full analysis of the types and uses of wrenches
▲ Fixed wrench
A fixed wrench has an opening of fixed size at one or both ends, and is designed for turning nuts or bolts of specific sizes. This type of wrench is very common, and as long as its size matches the requirements, it can easily complete the pre-tightening task. It is worth noting that the sizes of the two ends of the fixed wrench are not the same, and it needs to be selected according to the actual situation.
▲ Plum wrench
The plum wrench has a working end with a hexagonal hole or a twelve-pointed hole at both ends. This design makes it particularly suitable for turning nuts or bolts in a small working space, even when ordinary wrenches cannot be used. It is particularly suitable when the countersink depth is not deep, and it is more convenient to use when there is enough space. However, when the countersink depth is large, it is usually recommended to use a socket. In addition, the sizes of the two ends of the plum wrench are also different, and the selection needs to be made according to the actual situation.
▲ Combination spanner
The combination spanner cleverly combines the features of a single-headed fixed spanner and a plum spanner. One end is suitable for turning bolts or nuts of specific specifications, while the other end is suitable for operation in a small space. This design allows it to play its advantages in different occasions, thereby greatly broadening its application range and bringing great convenience to users.
▲ Adjustable spanner
The adjustable spanner, with its unique structural design, can flexibly adjust the opening width within a certain size range to adapt to bolts and nuts of different sizes. This type of spanner is widely used in the industrial field and is often used for applying preload. Although its size is adjustable, the preload that can be achieved is limited, and in some cases it may not meet specific preload requirements.
▲ Hook spanner
The hook spanner, also known as the crescent spanner, is designed for turning flat nuts with limited thickness. Its uniqueness lies in its ability to flexibly handle nuts within a size range for preload work, which is particularly suitable for complex assembly environments.
▲ Socket wrench
The socket wrench consists of multiple sockets with hexagonal or twelve-pointed holes, as well as accessories such as handles and extension rods. It is very suitable for tightening bolts or nuts in narrow or deep recesses. It is easy to load and unload, and is mainly a ratchet wrench. This wrench performs particularly well in special assembly environments, and often uses a long socket to complete the pre-tightening task. Ratchet wrenches are highly praised for their ease of use, which indicates their broad development prospects in the future.
▲ Hexagon wrench
The hexagon wrench is L-shaped and the rod design is specially designed for screwing hexagon screws. Its model is determined by the size of the hexagonal opposite sides, while the bolt size follows the national standard. This wrench is mainly used to tighten or remove round nuts on machine tools, vehicles, and mechanical equipment, and has a wide range of applications. With the popularity of hexagonal bolts, hexagonal wrenches are becoming an indispensable tool. Its small body and excellent pre-tightening ability have made it stand out in the wrench industry and become a shining new star.
▲ Torque wrench
A torque wrench is an indispensable tool in assembly work. It can display the torque applied when turning a bolt or nut, or emit a light or sound signal when the torque reaches a preset value, thereby ensuring the accuracy of assembly. This wrench is particularly suitable for occasions where the torque size is clearly specified, such as automobile manufacturing, mechanical maintenance, etc. However, due to its set specific torque range, the application field of torque wrenches is relatively narrow. In contrast, China is still in its infancy in the use of torque wrenches, and often judges whether the preload is sufficient based on experience, which is obviously not scientific enough and may affect the service life of the equipment. Therefore, in occasions where precise calculation of torque is required, the torque wrench is undoubtedly the most appropriate choice.
▲ Knocking wrench
In order to make it easier to apply the preload manually, the tail of the wrench is designed with a thickened area to enhance its ability to withstand knocking, thereby effectively transmitting a huge preload.
▲ Pointed tail ratchet wrench
There is no significant difference between the pointed tail ratchet wrench and the conventional ratchet wrench, and its use environment is also roughly the same. However, its unique pointed tail design allows for easy installation of the drill, which can be easily inserted into overlapping screw holes and used with bolts to significantly improve efficiency.
02
Wrench selection and material recommendations
Wrenches, a seemingly ordinary tool, are very particular about materials. The mainstream materials include carbon steel and chrome-vanadium alloy steel. Although they are difficult to distinguish from the appearance, the material and processing technology have a direct impact on the service life of the wrench. For home use, ordinary wrenches are sufficient to meet the needs; but in assembly workshops or other environments where wrenches are frequently used, it is more appropriate to choose brand wrenches that are wear-resistant, durable and have strict tightening requirements. Although the price is slightly higher, in the long run, high-quality wrenches can save you more purchasing costs. Therefore, it is crucial to choose the right wrench according to your personal needs.
