How to use ticks correctly for squeezing terminals

Quality connection of wires in the car is not just a matter of convenience, but a critical aspect of fire safety and stable operation of the entire onboard network. Any poor-quality contact sooner or later leads to heating, oxidation and, in the worst case, to fire wiring. This is why we use a specialized tool such as plug-clutchIt is a requirement for professional repair.

Unlike soldering, mechanical crimping provides a more reliable connection that is resistant to vibrations that inevitably occur when a vehicle is moving. A properly executed contact retains its properties for decades without requiring additional maintenance. In this article, we will discuss in detail how to choose the right tool, what types of terminals exist, and how to avoid common installation errors.

Many motorists neglect the use of a specialized tool, relying on a passage or hammer, which is a gross violation of technology. Krimperes (as commonly called crimping mites) are designed with the geometry of the tips in mind, ensuring uniform pressure on all sides. This allows for a monolithic connection where the wire and terminal become one.

Principle of operation and types of crimping tool

The main task of mites for crimping is to compress the metal sleeve of the tip around the wire veins with a certain force. This process is called strainIt should occur strictly according to the specified parameters, so as not to damage the veins, but to ensure the maximum contact area. Simple models of tools work on the principle of lever, compressing the matrix (working part) when the handles are reduced.

There are also more complex mechanisms equipped with a rattle (snoring mechanism). This system does not allow you to unclog the sponges of ticks until the complete completion of the crimping cycle. This ensures that the effort is applied to the fullest extent, eliminating the human factor and ineffective. For beginners, rattling models are preferred as they automatically monitor the quality of work.

Professional clamp-tick They often have multiple sockets (matrixes) of different sizes to work with different wire diameters. This versatile solution allows you to have one tool for the entire range of work in the car, from thin signal lines to starter power cables. It is important to monitor the condition of the working surface of the matrix so that there are no bullies on it, which can damage the insulation.

⚠️ Warning: Never use crimping mites to snack on wires unless they are combined with bokoks. An attempt to snack on a thick vein can deform the matrix, after which a high-quality crimping will become impossible.

The sizes of the matrices are usually marked with color or numbers (e.g., 0.5-1.5 mm2, 1.5-2.5 mm2).

Classification of terminals and tips

Before you start, you need to clearly understand what type of connectors you are dealing with. In automotive electricians, the most common sleeve tips (sleeves), ring and pin terminals. Each type requires a different approach and often a specific matrix shape in ticks.

The sleeves of the sleeves known as Nshwi (The sleeve is a sleeve-like sleeve), designed for multi-core wires. They have a plastic cuff that protects the wire from breaking and provides additional insulation. Cracking such terminals is made along the entire length of the metal part, creating a dense ring around the beam of veins.

• 🔌 Ring terminals - used for bolt connections with body weight or battery, provide the maximum contact area.
• 🔌 Scapular terminals (fork and pin) - are used in places where frequent connection and separation of contacts are required, for example, in relays or fuses.
• 🔌 Connecting sleeves - serve for the joint connection of two wires without the use of twisting, which is unacceptable in the car.

It is important to select the size of the terminal strictly for the cross-section of the wire. If the sleeve is too large, the crimping will not provide the necessary pressure. If small, you risk eating a piece of the veins or damaging the insulation when trying to shove the wire inside. At quality terminals, the size is often stamped on the metal part or indicated by the color of the plastic insulation.

Preparation for work: choice of tools and materials

The success of the operation depends not only on skill, but also on proper preparation. Before starting the work, make sure that your clipper They're good, and the sponges are clean. To work, you will also need quality stripping mites (strippers), which remove insulation without damaging copper veins.

The use of a knife or conventional bogo cutters for cleaning often leads to incisions on the veins. In vibration conditions, such a wire quickly breaks, causing a chain break. A professional stripper is set up to work with a certain range of cross-sections and guarantees the integrity of the conductor. This is especially important for multi-core wires used in auto electrics.

It is also worth preparing a heat shrink tube or insulation tape for subsequent protection of the connection. Although many insulated terminals already have a plastic cuff, additional sealing of the wire entry point into the terminal will prolong the life of the contact, protecting it from moisture and reagents. In the car, this is a critical stage.

Don't forget to be safe. When working with the onboard network, especially if you are involved in power circuits, it is recommended to turn off the battery's negative terminal. This will eliminate accidental short circuit of the tool on the car body, which can lead to serious damage to the wiring or even fire.

Step-by-step instruction: technology of correct crimping

The process of clenching can be divided into several clear stages. First, it is necessary to clean the wire for a length corresponding to the length of the metal part of the terminal. Cleaned-out part must be fully included in the sleeve, but not extend beyond it and do not leave the bare wire outside under the insulation.

Then twist the cleaned veins with your fingers to give them a tight round shape. Put the wire in the terminal all the way through. Make sure all the veins are inside and the wire insulation comes slightly under the plastic cuff (for insulated terminals) or is level with the edge of the sleeve (for uninsulated).

Insert the terminal with the wire into the corresponding nest of ticks. For sleeve tips, an oval matrix is used, for ring tips, a trapezoidal one. Reduce the grips of ticks to a characteristic click (if there is a rattle) or until the sponges completely close. Don’t be afraid to make an effort – good contact requires a lot of pressure.

Type of terminal	Color marking	Wire cross-section (mm2)	Diameter of the hole
Busting room (NSWI)	Red.	0.25 - 1.5	-
Annular	Blue	1.5 - 2.5	M4, M5, M6
Scapular	Yellow	4.0 - 6.0	M8, M10
Coiler	Red.	0.5 - 1.5	-

After clenching, carefully pull the wire and terminal in different directions, checking the reliability of the connection. If the wire pops out or staggers, the operation must be repeated using a new terminal. Repeated compression of the already used sleeve is unacceptable, since the metal has already passed the deformation stage and will not provide the necessary effort.

⚠️ Note: If you use uninsulated copper tin tips, be sure to isolate the connection with a shrink tube after crimping. Just the wound tape will eventually slide and dry, leaving the dangerous contact open.

Why not use a ration instead of a clench in the car?

The soldering makes the wire rigid at the connection point. With vibrations typical of the car, the hard section becomes a point of tension, and the wire breaks next to the solder. The clamp retains the flexibility and elasticity of the connection.

Common Mistakes and How to Avoid Them

One of the most common mistakes is to use the wrong tool. Attempt to squeeze the terminal with pliers leads to the fact that compression occurs only from two sides, and not in a circle. This creates gaps between the veins and the sleeve wall, where air and moisture enter, causing rapid oxidation and resistance growth.

Another mistake is choosing a too small terminal. Some try to cram a larger cross-section wire into a narrow sleeve by flattening the veins beforehand. This reduces the effective cross-section of the conductor, which, when the current passes, will lead to overheating and melting of the insulation. Capacity The connection is determined by the narrowest place.

• 🚫 Insufficient crimping - leads to sparkling and heating under load.
• 🚫 Damage to insulation with sponges of ticks - creates the risk of short circuit on the body.
• 🚫 Insulation clamp instead of wire – the plastic cuff does not conduct current, contact will be absent.

The condition of the wire itself is also often ignored. If the veins are oxidized (darkened) or contaminated with oil, quality contact will not work even with perfect crimping. The cleaned copper should shine. If the wire is old and brittle, it is better to replace it completely, as it will not withstand vibrations.

Tool maintenance and safety engineering

Clutching mites, like any precision tool, require care. Periodically lubricate the hinge joint with light engine oil so that the handles remain smooth. If traces of corrosion appear on the working sponges, carefully clean them with small sandpaper, trying not to disturb the geometry of the profile.

Keep the tool in a dry place, preferably in a special case or case. Blows against other instruments can lead to microscopic distortions of the matrix, which are not visible to the eye, but are critical for the quality of the crimping. Cheap Chinese mites are often made of soft steel that wears out quickly, so investing in one quality tool from a well-known brand is better.

Always wear protective glasses when working. Copper veins when pruning or squeezing can fly to the sides, falling into the eyes. Also, keep your fingers safe: the force on the levers of the ticks is great, and accidental skin contact between the sponges can lead to serious injury.

⚠️ Note: Do not use crimping mites to work with wires under voltage. Although handles often have insulation, they are not designed for high voltage and are not a guarantee of protection against electric shock when short circuit.

Regularly check the integrity of the insulation on the handles of your tool. Cracks or scuffs reduce the dielectric properties of plastic. In a garage environment where the floor can be wet or metal, this poses a direct threat to life.

Frequent Questions and Answers (FAQ)

Can I squeeze a copper terminal on an aluminum wire?

Absolutely not. Copper and aluminum form a galvanic pair, which leads to rapid oxidation of the contact and its destruction. For aluminum wires, there are special terminals with quartz-vaseline lubrication inside or bimetallic adapters.

Which instrument is better: with or without a rattle?

For beginners and rare home use, the rattling model is definitely better. She's ruling out an unfit. Professionals sometimes prefer the fixture-free models for speed, but they require a lot of experience to control the effort.

Do I need to squirt the wire before squeezing?

No, you can't huddle a polycore wire before sleeve-plugging. The solder under pressure "floats", and the contact will weaken over time. The clamp works due to the plastic deformation of pure copper. Luring is allowed only for monolithic wires in specific cases, but not in automotive wiring.

What to do if there are no special ticks at hand?

In an emergency situation, you can use narrow passages, trying to squeeze the sleeve evenly from four sides, turning the tool. However, this is a temporary measure. This connection should be replaced as soon as possible by a correctly executed crimper.

How to choose the size of the thermal shrinkage for insulation?

The diameter of the shrinkage before shrinkage should be greater than the diameter of the terminal, and after shrinkage (usually shrinkage 2: 1 or 3: 1) - tightly fit the connection. For automotive terminals, tubes with a diameter of 6-10 mm are most often suitable before shrinkage.