Applications
Cap nuts are used to add aesthetics to the equipment and to hide its external imperfections. The scope of their application is constantly expanding. This could be:
- furniture manufacture;
- mechanical engineering;
- instrumentation;
- manufacturing of various equipment, including medical;
- food industry;
- bicycles and motorcycles;
- design objects.
The main nuances of use are as follows:
- hardware with a small pitch and a nylon ring work well with vibration, the probability of spontaneous unwinding is extremely low;
- fasteners with a large nominal diameter and coarse pitch are used for high axial loads when the thread is breaking off.
In the following video, you will find a brief overview of DIN 1587 cap nut.
Species overview
Like any other hardware, the self-locking nut is available in several varieties.
- With nylon ring. This device looks like an ordinary nut, in the upper part of which a nylon ring is hidden. Hardware with insert can be made in strong and high strength class. This nut is usually used in conjunction with a bolt or screw.
- With a washer. Nuts of this type are considered a modern type of fastener, which is quite functional. The presence of a washer in the fastener prevents the connection from untwisting.
- Flanged is a nut that has a hexagonal shape. Such hardware is made of solid metal and can have a diameter from M5 to M16. It can be used in conjunction with fasteners that have a similar thread. Due to its high strength, the hardware is able to ensure the reliability of fastening.
- The self-locking cap nut is equipped with a nylon ring and is available in thread sizes from M4 to M16. An analogue of this hardware is considered to be a device without a non-metallic ring. These nuts are used to protect threaded fasteners from oil leakage. Self-locking fasteners have found their way into the assembly of vehicles and specialized types of equipment.
It is worth highlighting a few of the most common self-locking nut models.
- DIN 982. The galvanized product is equipped with a nylon ring. When using this hardware, you can get high locking parameters, as well as the reliability and durability of the fasteners. Consumers often give preference to this product, as it is able to fix details with high quality, while it does not need additional equipment.
- DIN 985 A2 and A4 are made of stainless steel. This type of fastener does not rust and protects the connection from the negative effects of environmental factors. During the manufacture of A4 nuts, manufacturers add molybdenum, so the product is reliably protected from chlorine and alkali.
- Nut DIN 6927 8.0 and 8.8. This nut model is equipped with a flange, so it can be used in various production areas. This hardware does not have a non-metallic retaining element. It has found its use in harsh conditions. In this case, the use of a washer or a grover is not required.
Features of operation
Self-Locking Nuts are advanced mechanisms that hold units together, which are subjected to high vibration loads and shock manipulation. If ordinary fasteners can crack after several blows, then self-locking does not. The finished hardware should be characterized by the reliability of locking, the ease of tightening the thread. In this case, the master should know that the thread of such a nut can be unscrewed and tightened more than once.In the principle of operation of self-locking hardware, there is a frictional locking, due to which a high level of friction in the threaded turns is ensured. Ideally, such a nut should be tightened on the correct side and then heat treated.
To prevent the fasteners from unwinding, it is worth following the following recommendations:
- use lock nuts;
- to carry out installation with a spring washer;
- fix the thread with a special type of glue;
- use nuts with nylon or polyamide ring.
Difficulties in using self-locking nuts include the following:
- the need for special surface treatments;
- creating additional stress in the case;
- danger of crushing the conical bearing surface;
- impossibility of full tightening in some cases.
Self-locking fasteners do not unwind, so their reliability is especially important in the manufacture of aircraft and missiles. They replaced standard nuts with less efficiency and difficulty in tightening. These mechanisms are not afraid of vibrations and vibrations, therefore, if there is a choice, experts advise buying self-locking fasteners.
For self-locking nuts, see the video below.
What it is?
The fastening element in the form of a self-locking nut is recommended as a connecting piece between elements of various structures. Standard hardware can only be screwed onto products that have threads. To make the connection stronger in this case, it can be strengthened with a grover, cotter pin, washer. The self-locking nut has a nylon retaining ring, so it can be used on its own without any additional fasteners. The advantage of hardware made in accordance with GOST is that it works with high quality and reliably connects the elements to each other. If the consumer prefers a self-locking nut, this means that he can be sure that this hardware is made of high quality steel and at the same time has a zinc anti-corrosion coating.
The construction of this type of hardware has the following components:
- an ordinary nut with six faces;
- board with one-sided increase;
- nylon spacer.
Views
Fasteners with a through hole are widely used in the furniture industry, while furniture nuts can vary in shape, as well as in the parameters of the internal thread. The most common hardware is a hex nut, its technological design allows for rotational movement progressively, evenly, without requiring special physical effort when tensioning.
Nuts can be made in a multi-faceted shape, have a trapezoidal or metric thread. Different diameters make furniture nuts unique - this allows them to be used in any work, even when the weight of the structure is strictly limited.
There are several popular types of nuts on sale that are used in the manufacture of furniture.
Spherical - the model is a typical hex nut with a cap outer surface and a plug on one end of the threaded hole. It is used in detachable mounts. The cap helps to close bolts and other protruding elements, thereby reducing the risk of injury during product use, as well as giving the structure an aesthetic appearance.
Hammered
Such nuts are mainly used in automated furniture production; they have not found widespread use in everyday life. In the factory, a hole of a suitable diameter is formed in the structure, after which the nut is hammered in with a hammer.
This ensures accurate assembly and high speed of work.
Mortise
These furniture fittings are manufactured from corrosion-resistant, zinc-plated stainless steel. Outwardly, this design resembles a sleeve, while the internal thread remains flat. A metal disc with a hole at the end is provided.This design allows you to firmly hold the hardware in the material and prevent the risk of twisting during the tightening process. Widely demanded for unilateral fixation.
Hidden
Hidden furniture nuts play a special role among the entire assortment of hardware. Their structure provides the most durable fastening when assembling furniture blocks of any type. A countersunk nut looks like a small bar with a metric type female thread. The hat is semicircular, decorative. All elements are manufactured from corrosion-resistant galvanized steel. Models are indispensable for assembling tables, as well as beds and cabinet furniture, it is distinguished by a decorative look - hardware is almost invisible on the outside of furniture, therefore it is often used in the manufacture of cabinet furniture.
Peculiarities
In the old days, nails or self-tapping screws were mainly used for the installation of wooden elements. However, as practice shows, these fasteners are not enough - the connection created by them weakens over time, and this can lead to injuries during the operation of furniture. That is why furniture nuts have come to the fore in recent years, they are optimal for the formation of high-strength joints.
The furniture nut is a fastening element with a threaded hole. It is made of galvanized steel, as well as of durable non-ferrous metal alloys.
The usual one is used in those areas of fixation where it is required to create the strongest adhesion with the possibility of further dismantling. The part is used to make a threaded and eccentric tie, allows you to create a movable, detachable and one-piece fixation.
Furniture nuts are widely used in the manufacture of kitchen and cabinet furniture, as well as in the assembly of bed frames and sofas. The hardware ensures the strength and durability of the connection, and greatly reduces the likelihood of thread breakage during operation.
Fixing rules
Installing any furniture nut is not difficult, in fact it is a one-way process. The most important thing in the work is to adhere to the established sequence of actions, this will prevent deformation of the thread, as well as breakage of the bolt.
During installation, a nut tool of a suitable size is usually used, if you perform tightening without it, then there is a high risk of uneven force tension. The main requirements for tightening the nut are as follows:
- the nut to the landing site must be screwed loosely, it is possible by hand, avoiding hesitation, the final installation is performed with a key;
- in the process of twisting the hardware, the end should be located exactly perpendicular to the direction of the axial rod, the presence of potholes and roughness is not allowed;
- in the case of lengthening the bolt, the tightening process should be kept under control; in this case, the turn of the key is performed according to the angle of rotation of the nut.
Before the very beginning of the connection of the structure, it is necessary to complete a complete set of all hardware elements, to make sure that they are compatible in terms of the type of protective coating, type of steel and mechanical characteristics. At the same stage, one should take into account the type of installation, the readiness of the seats, as well as the general aesthetics of the final connection.
After completing the surface preparation and the hardware itself, it is necessary to clean it of grease, check the functionality of the functional thread. If damaged areas are found, thoroughly clean them and perform a visual inspection in order to determine the accuracy of the adhesion of the surfaces to be joined.
Tightening the nut directly begins with its landing on the wooden module and initial tightening by about 75%. Next, you need to make sure that there are no gaps around the entire circumference and if the mestizo is located correctly, perform the final tightening of the nut.
During installation, it is important to adhere to safety standards
The following video talks about the types of nuts.
Peculiarities
The cap nut is a combination of a regular hex nut and a ball cap. Compared to standard fasteners, it has a number of advantages.
Esthetic appearance of the connection
The decorative nut looks much better than the protruding thread of the bolt and is less eye-catching. In addition, it can be painted with paint, and unlike a regular nut, it can be easily unscrewed.
Security and corrosion resistance
Moisture and corrosive substances do not get on the thread, therefore the connection rusts less.
Security. The spherical cap completely hides burrs, threads and protruding bolts, so it is impossible to get scratched or injured on them.
Ease of dismantling. Dust and dirt do not accumulate on the threads, so the decorative fasteners are easier to unscrew.
There is only one drawback - you need to correctly select the protruding length of the bolt. Well, such hardware is a little more expensive. Typically, cap nuts work without heavy loads and therefore do not require a washer. But if the connection must be strong, then you must first put a washer, then tighten the usual nut and then screw on the cap nut, which will act as a locknut. Then all the advantages are retained and a strong connection is obtained.
