Model selection shall be based on the applicable s
Time：2022/5/31 Browse：5834
Type selection shall be carried out according to the characteristics of fasteners. Although the fasteners are small, they are diverse. There are 12 categories and more than 400 varieties according to the major categories. There are 32 categories and nearly 100 varieties of bolts and screws alone. There are also 10 categories of the end types of the rod. The members of such a large fastener family can not be introduced one by one. The selection should be based on the principle of economy. Now, the head type is taken as an example.
1. Hexagon head is also used in this kind of products. It has high mechanical properties, is convenient for wrench tightening, can apply large tightening torque, and is widely used. The bearing surface has a convex or flange surface, has the function of washer, increases the pressure bearing surface, and has good anti loosening performance. It can be used for the connection of steel structural parts and key mechanical equipment structures.
2. The square head has a large head area, which is convenient for the wrench to tighten and rotate. It can apply the same large tightening torque, but it is not easy to tighten. It is mostly used in the structures that are relatively thick and often disassembled, but it is not suitable for moving components.
3. Pan head, head size, slotted head, etc. are convenient for tool screwing. They are mostly used for products with low strength and torque. They are generally used for mechanical equipment products with small size, such as household appliances. The specifications are mostly below Mio, and more are used below M6
