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  3. How to distinguish the flat head screw a...

How to distinguish the flat head screw and countersunk head screw

How to distinguish the flat head screw and countersunk head screw

Flat head screws and countersunk head screws are unclear, these two tricks can be easily distinguished


In daily life, screws are too common, and different types of screws are used in many places, whether it is the assembly of furniture or the firmness of doors and 
windows. There are two kinds of screws, which seem to be similar, but they are different in use. The flat head screw and the countersunk head screw are only one word 
difference, but the two are quite different.


1. Different "looks"

If you have seen these two kinds of screws, you will find that the "looks" of these two kinds of screws are still obviously different. The flat head screw is just 
like the name, the screw head is a flat surface, and the bolt part connected below, but this connection should be focused Note that it is a 90-degree connection, which is connected at a right angle.

But the countersunk head screw is different. Although the screw head part also has grooves, the way it is connected to the bolt is very different from the flat head 
screw. It starts from the screw head part and starts to go down in a tapered shape until Connect with the bolt below, so it is clear that the two nut and bolt 
connection methods are different, so they look different.



3. It is very simple to distinguish from the effect of use

Flat-head screws are actually very common in life. For example, if you want to screw a flat-head screw to a wooden board, and after tightening it with a screw, 
you can see that the nut of the flat-head screw is left on the surface of the wood and can be touched by your hand. This one has a flat head.

But the other screw is completely different. If the screw is screwed into some parts, the nut of the screw cannot be seen on the surface, this is a countersunk head. 
In fact, if you think about it carefully, you can understand that sinking your head means sinking.


In addition, it can be distinguished from the "partner" of these two screws. Flat head screws are usually used with spring washers, but countersunk screws need to be 
tapered because of their "look". Ordinary household flat gaskets do not work.


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