At first glance, these products are very similar, but judging by the title, the difference still exists. If you delve into the details, we immediately understand, what's the difference between them. In what process is needed screw and in which the screw. In the first place, to understand their difference should understand the specific purpose of the screw and screw.
Screw
Based on the stored screw thread, while it may be coated thread from beginning to end. Screws are of various kinds. The head of the screw is a semi-circular, hexagonal or a tie. Usually, the end of the screw - conical.
Screws
The present samorezah acute basis, it is similar to the screw cap. Contact part of the screw tapers or looks like a drill. Most often this type of screws used for metal.
I became interested, so I tried to figure out what the difference is. At first glance, I have determined that the screw thread is cut in only partially, while the screw completely. But in practice, there was all wrong. Here are the screws on which the thread is not completely.
In this case, the opposite is true, the screw thread is completely covered:
Anyway, the difference between the self-tapping screw and there.
- When you thread the screw, it is necessary before this Drill a hole, that he lay down close to the material. As for the self-tapping screws, such procedures do not need, it is firmly screwed into the wall right next to your material, thereby slicing own thread and hole.
- The second difference is that the screw when it is screwed, he cuts his way, and made of a hard metal. As for the screws, they are made from soft metals and before using them need to prepare a place where he would be screwed. So you should consider if you'll screw the screw into the blank wall material, it will pursue and break.
- The third difference between them - a thread pitch. As the screw is screwed into the already prepared hole his pitch smaller. At the screw pitch is larger, it must be on its own to make a place to enter the desired material.
Consider all these factors when working with these products, because the wrong material chosen or hardware you may create problems and waste too much time. Before you perform the desired operation, to determine the material, based on this, pick what you need: self-tapping screws or screws.
For any "cushion" clever, say at once: I am aware that in accordance with GOST 1145-80 screw - a screw with a countersunk head, self-tapping.
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