I don’t know if you have noticed it. Although the nuts vary greatly in size, most of them are hexagonal. In our opinion, we are quite used to it, and it is not surprising at all. But if you think about it carefully, the question arises, what is the reason why the nut must be hexagonal. Have you ever thought about this question, why not make it into a quadrangular or triangular shape?
nut
DIN934 Hex Nuts Whitewashed
From the perspective of rotation angle, the regular quadrilateral is the best in theory, but the rotation angle of each operation must be slightly greater than 90 degrees. The actual operation space may be limited and cannot rotate 90 degrees, so a smaller rotation angle should be selected;
From the point of view of the use effect, the regular octagon can also be used theoretically, but the angle of the nut does not fit well with the wrench, and it is easy to slip off when using force, so it cannot be used;
Practice has proved that the regular hexagon is the most suitable, and the operating angle is greater than 60 degrees, and the corners will not slip.
In addition, the hexagonal shape of the nut is mainly for convenience and to maximize the use of materials. On the machine, the position where the nut is installed is sometimes not quite ample, and the wrench for screwing the nut can move very limited. With hexagonal nuts, you only need to turn the wrench 60 degrees at a time. Just be able to tighten the nut slowly. And the square nut just needs to be pulled 90 degrees every time. That is to say, in order to tighten the nut, the hexagonal shape is smaller, but the octagonal nut is easy to slip due to the small contact surface between the wrench and it, and is usually rarely used, so the hexagonal nut is the most convenient to use.
Nuts are generally milled from round materials. Using the same round rod to make hex nuts requires less metal cutting than making square nuts. Therefore, hex nuts made of round rods with the same thickness are far less Larger than a square nut. Generally, in terms of strength, larger nuts are always stronger than smaller nuts, that is, the raw materials are used to the maximum extent.
Look at the wrench again, the handle of the ordinary wrench and the wrench can form an included angle of 30 degrees, so when the place where the nut is installed is very narrow and the wrench cannot move freely, just turn the wrench on a nut, and then turn the wrench over. Come over and turn the nut again, and turn it back and forth several times in this way to tighten the nut. There are two shapes of nuts, one is hexagonal, which is widely used, and the other is regular quadrilateral, which is mainly used when it is fixed with the structure. This kind of situation rarely occurs, but there are also, generally made into hexagonal This is because when the nut is screwed in this way, in the case that the wrench cannot be pulled continuously due to the structural limitation, the wrench only needs to be screwed at least 60 degrees each time, while the regular quadrilateral needs to be 90 degrees, so that the structure is reserved for the wrench. The space will increase, and the regular octagon is as mentioned above, and it is easy to damage the corners of the nut, making it impossible to turn it any more. However, the regular polygon with an odd number is difficult to turn with a wrench and can only be turned with a sleeve. , which is inconvenient and will be limited by some structures.
In summary, the hexagonal nut is the most convenient to use, and the design of the hexagonal nut is more suitable for installation and fastening, so that workers can find the occlusal surface without special care when putting the wrench on the nut, which greatly improves the work efficiency. efficiency.
Post time: Mar-06-2023