Sems screws pan head cross combination screw

Combination screw refers to a combination of a screw with a spring washer and a flat washer, which is fastened together by rubbing teeth. Two combinations refer to a screw equipped with only one spring washer or only one flat washer. There can also be two combinations with only one flower tooth.

The material of the combination screw is divided into stainless steel and iron, while iron is made of different iron spiral wires. The wire used for general combination screws is 10101018, 10B21, etc. 10B21 is used to make 8.8 grade combination screws, such as 8.8 grade hexagonal combination screws. Stainless steel combination screws are generally used with SUS304201 combination screws, which are rarely used because the hardness of stainless steel 201 screw wire is not easy to control and is prone to cracking. 

In general, electroplating of combination screws refers to the electroplating of iron combination screws. Electroplating can be divided into environmentally friendly and non environmentally friendly. The commonly used electroplating colors for combination screws include environmentally friendly color zinc, environmentally friendly blue zinc, environmentally friendly white zinc, environmentally friendly nickel, red color, white zinc, white nickel, etc. The purpose of cross recessed combination screws, hexagonal combination bolts, and self tapping combination screws is the same as that of corresponding cross recessed screws, hexagonal head bolts, and self tapping screws. The main feature of these combination screws is that they are all equipped with corresponding washers, which is very convenient to use. 

Overall, combination screws are mainly widely used in electrical, electrical, mechanical, electronic, household appliances, furniture, ships, and so on. But different combination screws have different purposes, such as cross head combination screws, which are generally used on small electronic products. The larger cross hex combination screws are used on larger electrical products, such as frequency converters. Some larger frequency converters have many cross hex combination screws available. Hit the frequency converter casing to loosen and tighten it.

And the two combination screws with flower teeth are used on the frequency converter to break the paint, making all the two combination screws on the casing board energized. For example, the square pressing wire two combination screw itself is a pan head screw with a square pad two combination screw. It is generally used on wiring terminals for wiring and crimping purposes. 

The difference between combination screws and ordinary screws 

(1) The combination screw is equipped with an additional spring washer or a flat washer compared to ordinary screws, or it is a triple combination component with an additional spring washer. This is the difference in appearance. 

(2) Differences in mechanical properties. The combination screw is composed of three accessories, and in terms of performance, it definitely requires three fasteners to work together. The mechanical properties of the combined screws are more secure and convenient to use. The biggest advantage of combining screws is that they can make production line operations more convenient and efficient, improving work efficiency. 

(3) Differences in usage. The use of ordinary screws is more extensive than that of combination screws. Generally, ordinary screws are used in industrial products, and combination screws are only useful on specific product materials. When screws need to be used with spring washers and flat washers, combination screws are only needed at this time.