What is a construction, ruffled and screw nail

Explanatory dictionaries describe a nail as a wooden or metal pointed rod with a head at the blunt end. But, unfortunately, such a meager description does not give a complete picture of this amazing invention of mankind. After reading this meager line, many imagine only a simple construction nail: a smooth knitting needle with a quadrangular point, which is sometimes "complicated" with grooves near the head. Meanwhile, this fastener is different.

What is the nail shank

The rod of this product can be cylindrical, conical, pyramidal and parallelepiped.. The latter option is the hardest to imagine, although it only takes a look at the old railway crutch - a nail, thanks to which the rails were held (and in some places are still held) on wooden sleepers.

And the rod can also be smooth, twisted, threaded and ruffled. The first option is the simplest - what we see at the construction nail.

Twisted or screwed nail - a slightly more complex option, vaguely resembling a drill. This shape allows it to be screwed into the material, thereby increasing the bond strength. To pull out such a rod, you need savvy, because it needs not only to be pulled, but to be turned in the right direction.

Threaded dowel-nail, which is hammered into a dowel, and is intended for fixing objects on brick, concrete or stone, is a reliable fastener. This is a rather unique invention, which is hammered into the wall with a hammer, sits firmly in it, but if necessary easy to pull out - you just need to arm yourself with a suitable screwdriver, hook it onto the slot in the hat and unscrew fasteners.

Ruffled nail differs from the previous versions in transverse notches. They start from the tip and can be located either along the entire length of the rod, or occupy only a part of it. Due to this feature, the wood fibers tightly cover the rod, after which each notch begins to play the role of a kind of stop. The result is natural: such a nail sits 4–5 times more securely than a construction one and it will not be possible to pull it out - more likely, the rod will break or the wood will not withstand.

What is a hat

Here, as in the case of the rod, options are also possible. Let's start with the fact that some nails do not have a head at all, for example, like a dowel or a pin. Such fasteners are designed primarily to prevent transverse (perpendicular to the axis rod) displacement of the parts to be connected, without particularly interfering with separating the elements, removing them along the axis fasteners.

If there is a hat, then it can be round or D-shaped, like the previously mentioned crutch. In this case, the head is flat, convex, with a slot or notches. The shape in this case is also dictated by the purpose of the nail. But anyway the cap performs two important functions at once: it prevents the rod from being excessively deepened into the material and reliably fixes the parts to be fastened, preventing them from displacement in any direction.

This seems to be all - the description can be considered complete. But if some important points were not accidentally included in this article, please tell me about it in the comments.