Combination screw material is divided into iron and stainless steel. Iron is made of different iron screw wire. General combination screw wire is used 1010,1018,10B21 and so on. 10B21 is used to make 8.8 combination screws. Like the 8.8-level hexagonal combination screw, it is used for 10B21 wire. After doing a good job, go to heat treatment. After heat treatment, remove hydrogen and electroplate. This is to prevent the spring washer of the hexagon socket combination screw from breaking. Stainless steel combination screws, combination screws market, generally refers to stainless steel SUS304 combination screws. 201 combination screws are generally done very little. Few combination screw manufacturers to produce 201 combination screws. Because the hardness of the stainless steel 201 screw wire is not well controlled, it is easy to produce cracks.
Screws
The combination screw is actually a type of screw, but it is a special point. Generally, it is a three-piece assembly or a two-piece assembly, but at least it is also a two-piece assembly that can be called a combination screw. The most important difference from ordinary screws is that one or more spring washers or more flat washers are used than ordinary screws. This is the main difference between the appearance of combination screws and ordinary screws.
In addition to the obvious difference in appearance, the combined screw and the normal screw must be distinguished from each other in mechanical properties and uses. The combination screw is a three-piece or two-piece assembly with flat washers. Of course, it is a flat washer with ordinary screws. Match the flat pad, and the flat pad will not fall off. Fastened into an assembly.
In terms of mechanical properties, the combination screw is a combination of three parts, and the performance is definitely required to use three fasteners together. The mechanical properties of the combined screws are even stronger. More convenient, the biggest advantage of combination screws is the ability to operate the production line quickly and easily, and improve work efficiency.
The difference between the use of combination screws and common screws lies in the versatility of the application. The use of ordinary screws is more extensive than that of combination screws. Basically, industrial products use ordinary screws and combine screws. It is only useful for specific product materials. When screws need to be used with spring washers and flat washers, combination screws can be used.