The difference between a combination screw and a stainless steel non-standard screw is that the combination screw is used in combination with other components, such as elastic washers, flat washers, splines, etc. Other screws are usually installed before rolling, but in rolling The rear gasket cannot be removed.

  The raw materials of combination screws are usually iron and stainless steel. The advantage is that they can be equipped with corresponding washers, which can make the production line easy and quick to operate and improve work efficiency. Therefore, they are widely used in electrical, machinery, furniture, boats, etc. What are the raw materials? Generally speaking, the raw materials of the combination screw are iron and stainless steel.

  Among them, the ones made of iron are made of different iron screw wires, under normal conditions, there are 1010, 1018, 10B21, etc. 10B21 is used to make 8.8 grade combination screws. Like the 8.8-level hexagon socket combination screw, 10B21 wire is commonly used to make it. After it's done, go to heat treatment. After heat treatment, remove the hydrogen and electroplating. This is to prevent the spring washer of the hexagon socket screw from cracking. The stainless steel combination screw, in the combination screw market, generally refers to the stainless steel SUS304 combination screw. 201 combination screws are generally done very rarely. Few stainless steel screw manufacturers go to produce 201 combination screws. Because the hardness of the screw wire of stainless steel 201 is not easy to handle, it is easy to produce cracks.

  Please pay attention to the following four requirements for choosing the right combination screw:

1. It depends on the requirements for the raw material of the screw, that is, the combination screw of that material is required, such as stainless steel or iron.

Second, it depends on the requirements for the national standard number of combined screws. There are rare standards such as GB9074.8, GB9074.4, and GB9074.13.

3. It depends on the machine functional strength requirements of stainless steel non-standard screws, such as whether the grade is 4.8 or 8.8, and the screws need not be hardened.

Fourth, the main thing to note is that there are many types of combination screws, such as three combination screws, outer hexagonal combination screws, cross pan head combination screws, inner hexagonal combination screws, stainless steel combination screws, high-strength combination screws, etc., like iron combination The screws are to be electroplated. Non-standard stainless steel screws are not required.