A fastener is a generic term for a class of mechanical parts that are used when two or more parts (or components) are fastened together.
Depending on the use of different cold heading machines to produce different types of fastening equipment.
The types of fasteners produced by the cold heading machine are bolts, studs, screws, nuts and tapping screws. The bolts are a kind of fasteners consisting of two parts: head and screw (with external thread). Used to fasten the connection of two parts with through holes. This type of connection is bolted. If the nut is screwed off from the bolt, it is possible to separate the two parts, so the bolt connection is a detachable connection. One end must be screwed into the parts with internal screw holes,
A type of fastener that has only the ends of the head that are internally threaded. When connected. The other end through the through-hole parts, and then screw the nut, even if the two parts fastened into a whole. This type of connection is called a stud connection and is a detachable connection. Mainly used for one of the connected parts of a larger thickness, requiring a compact structure, or because of frequent demolition, should not use bolted connections. By use can be divided into three categories: machine screws, set screws and special purpose screws. The machine screw is mainly used for a part that tightens the threaded hole,
3. Screw: also by the head and screw two parts of a class of fasteners. The fastening connection to a part with a through hole does not require a nut fit (this type of connection is called a screw connection and is also detachably connected; it can also be fitted with a nut for two The fastening connection between the parts is mainly used to fix the relative position between the two parts.Special use of screws such as rings and screws for the lifting parts used in the shape of the general was flat hexagonal cylindrical,
4. Nuts: with internal thread holes. Also has a flat cylindrical or flat cylindrical, with bolts, studs or machine screws, used to fasten the connection of two parts, making it a whole. But the thread on the screw for the special tapping screw thread. For fastening the connection of two thin metal members,
5. Self-tapping screw: similar to machine screw. So that it becomes a whole, the components need to make a small hole in advance, because of this screw has a high hardness, can be directly screwed into the hole in the component, so that the formation of the reaction of the internal thread. This connection is also a detachable connection. But the thread on the screw for the special wood screw with a rib,
6. Wood screw: also similar to the machine screw. The wood screws produced by the cold heading machine can be screwed directly into the woodwork (or parts) for fastening a metal (or nonmetal) part with a through hole with a wooden member. This connection also belongs to the assembly connection. Play to increase the contact parts connected surface area,
7. Washer: a shape of a flat ring of a class of fasteners. Placed between the support surface of the bolt, screw or nut and the connection part. Reduce the pressure per unit area and maintain the appearance of the connected parts is not damaged; another type of elastic washer, but also play a role in preventing the nut from loosening. Acts to prevent the movement of parts on the shaft or hole.