There are many types of screws on the market, and each is made of a different material. So, what are the types of screw materials? How to choose the right screws?

What kinds of screws

1, carbon steel

Carbon steel screws can be divided into low-carbon steel, medium-carbon steel, high-carbon steel, and alloy steel, the four kinds of low-carbon steel, which contains 0.25 percent of the amount of carbon, is also known as A3 steel. Medium carbon steel contains 0.25 to 0.45 percent carbon, high carbon steel contains more than 0.45 percent, and alloy steel is only in the base of ordinary steel with some alloying elements.

2, stainless steel

Stainless steel screws, there are austenitic and martensitic. For the austenitic type of screws, not only has a certain heat resistance, there is good corrosion resistance, weldability is also very high. The martensitic type of screws, in the corrosion resistance will be worse, but the strength will be better.

3, copper

Copper screws are also divided into brass, zinc-copper alloy these two.

How to choose the right screws

1, everyone in the purchase of screws, the first thing we need to look at is to be screws and nuts between the degree of conformity, to see if they can be combined.

2, the screw color is also need to pay attention to the purchase of the place, for different occasions, the use of the screw color is different, the normal color needs to be connected with the color of the items match. At the same time, also need to pay attention to the length of the problem, not too long or too short, which will lead to the phenomenon of unstable screw bite.

3, the choice of screws, it is also very important to choose the head type. In this regard, we need to consider the anti-tampering aspects, for example, for hexagonal or other special shape of the screw, you need to consider the appearance of the problem. In addition, for the screw stability requirements, it is necessary to choose the screws with spacers.