Ratchet wrench and how to choose specifications?

The ratchet mechanism of the ratchet wrench is a unidirectional intermittent motion mechanism composed of a ratchet wheel and a pawl. The ratchet mechanism is mainly composed of a rocker, a pawl and an outer ratchet. When the rocker swings clockwise, the pawl hinged on the rod will be inserted into the teeth of the ratchet wheel, so that the ratchet wheel can rotate through a certain angle at the same time. Knowing the internal principle of the ratchet wrench, let's take a look at some other common sense issues.
How to judge the size of the ratchet wrench, whether to measure the square cross-section of the ratchet wrench or other methods? Is it to measure the diagonal size of the square head? Or to measure the side length? The answer is to measure the "opposite side" of the square falcon, that is, two parallel sides. The square heads are all based on the imperial system. One inch is 25.4mm. After corresponding to 1/4", 3/8", and 1/2", the 1/2 inch ratchet wrench is calculated by dividing 25.4 by 2 The domestic ratchet wrench is called 12.5MM. As for what size ratchet wrench should be equipped with a socket with a nut and nut, it is generally stated in the detailed description at the time of purchase that the socket size is such as "6.3mm x 10mm "Or "1/4" x 10mm", the number in the front represents the size of Fang Falcon, and the number in the back represents the size of the screwable object.
Now there is a ratchet wrench called quick-release. What characteristics does it have? Self-locking quick-release ratchet has a button on the back of the wrench. Hold down the button and the socket will automatically fall off. If you don’t press the button, the socket will lock and won’t fall off. . For example, the quick-release ratchet wrench in the tool is not only standard professional type, but also a type of wrench with a 180-degree rotating head design. The wrench angle can be adjusted by 15 degrees each time. Locked at 13 different angles to assist the quick pull to reach the ideal disassembly position. The narrow and small ratchet head structure combines a precise 72-tooth high-efficiency ratchet design. It only needs 5 degrees of rotation space to quickly turn the nut and flexibly and quickly use it in narrow areas to improve work efficiency.
In addition, it should be noted that the transmission force of the ratchet mechanism is small, and there is impact and noise during work. The ratchet mechanism is only suitable for occasions where the speed is not high, the rotation angle is not large, and the power is small.
The ratchet wrench is used to tighten the nut and nut. It has the characteristics of strong applicability, easy use, labor saving, and high torque performance. It is the first choice for professional auto repair or machine repair.