High-quality cable crimping is the key to a reliable connection in car wiring, network systems or audio equipment. But even the most expensive connector will not save you from poor contact if the crimping is done incorrectly. This is where it comes to the rescue cable crimping press (crimper), which provides uniform pressure on the connector and guarantees the durability of the connection. However, not all tools are equally effective: some are suitable only for RJ45, others are for automotive terminals, and others are universal, but require configuration.

In this article, we will look at how to choose a crimper for specific tasks, what to look for when purchasing, and how to avoid common mistakes when crimping. We will pay special attention car wires β€” here the requirements for the tool are stricter due to vibrations, temperature changes and high currents. We will also compare mechanical and hydraulic presses, consider top brands (Knipex, Jonard Tools, HT Instruments) and give step-by-step instructions for beginners.

What is a crimping press and why is it needed?

Crimping press (or crimper) is a tool that deforms a metal sleeve or connector, ensuring tight contact with the wire. Unlike soldering, crimping requires no heat, maintains cable flexibility, and takes less time. The main advantage is reliable connection in conditions of vibration and humidity, which is critical for automotive electrical wiring.

Where is the crimper used:

  • πŸ”§ Auto electrics: crimping terminals, sensor connectors, audio system wires.
  • 🌐 Network cables: connectors RJ45, RJ11 for Internet networks.
  • πŸ”Š Audio/video equipment: RCA, XLR, Speakon.
  • ⚑ Power cables: sleeves for stranded wires (e.g. in electric vehicle charging systems).

Without a crimper, crimping can be done with pliers, but this is fraught with:

  • ❌ Uneven pressure β†’ poor contact and overheating.
  • ❌ Damage to insulation β†’ risk of short circuit.
  • ❌ Deformation of the connector β†’ inability to connect to the connector.
⚠️ Attention: In automotive electrical wiring, crimping with pliers is not allowed. CAN bus and lin tires. Even microcracks in the contact can cause malfunctions in electronic systems (for example, errors U0100 or U0121 on diagnostics).
πŸ“Š For what purposes do you most often use a crimper?
Auto electrics
Network cables (RJ45)
Audio systems
Other

Types of crimping presses: which one to choose

Crimpers are divided into several categories based on design and purpose. The choice depends on the cable type, frequency of use and budget. Let's look at the main types:

1. Manual mechanical presses

The most common type for household and semi-professional use. Suitable for:

  • πŸ”Ή Crimping RJ45/RJ11 (network cables).
  • πŸ”Ή Automotive terminals (Faston, Deutsch, Molex).
  • πŸ”Ή Sleeves for braiding (for example, for repairing wiring in the cabin).

Pros: compactness, low price (from 500 β‚½), ease of use. Disadvantages: require physical effort, not suitable for thick cables (cross-section > 6 mmΒ²).

2. Hydraulic presses

Used for crimping power cables (section 10–300 mmΒ²) and automotive high-voltage wires (for example, in hybrid charging systems). Operating principle: pressure is created by a hydraulic pump, which eliminates the need to exert great effort.

Application examples:

  • πŸ”‹ Crimping battery terminals (for example, Type 35 or Type 50).
  • ⚑ Connection of cables in electric vehicles (e.g. Tesla Model 3).
  • πŸ—οΈ Installation of industrial networks (cables NYM, VVGng).

3. Universal presses with replaceable dies

Professional models (eg. Knipex 97 53 01 or HT-768), which allow you to crimp different types of connectors by replacing the nozzles. Suitable for:

  • πŸ”Œ Automotive connectors (AMP, TE Connectivity).
  • πŸ“‘ Coaxial cables (F-connectors for antennas).
  • πŸ–₯️ Server cables (Cat6a, Cat7).

Disadvantage: high price (from 5,000 β‚½) and the need to buy additional matrices.

Press type Cable cross-section Application Price, β‚½
Manual (for RJ45) 0.1–2.5 mmΒ² Network cables, audio 500–2 000
Manual (auto terminals) 0.5–6 mmΒ² Faston, Deutsch, Molex 1 500–4 000
Hydraulic 10–300 mmΒ² Power cables, batteries 8 000–30 000
Universal 0.1–10 mmΒ² Multitasking (with matrices) 5 000–15 000
πŸ’‘

For automotive electrical wiring, a manual press with replaceable dies under Faston and Deutsch. Hydraulic models are only needed for thick cables (for example, starter cables).

Top 5 crimper brands: what to choose in 2026

The quality of crimping depends 80% on the tool. Cheap "no-name" models often produce uneven pressure, which leads to cold soldering (there is contact, but the resistance is too high). Let's consider proven brands:

1. Knipex (Germany)

The standard of quality for professionals. Models Knipex 97 53 01 (universal) and Knipex 97 52 04 (for coaxial) provide precise crimping thanks to:

  • πŸ”Ή Precision hardened steel matrices.
  • πŸ”Ή Ergonomic handles with anti-slip coating.
  • πŸ”Ή 10 year warranty (subject to operating rules).

Minus: price (from 7,000 β‚½).

2. Jonard Tools (USA)

Specializes in network cable tool. Popular models:

  • Jonard CT-300 - for RJ45/RJ11 with automatic handle return.
  • Jonard CT-725 - for crimping Cat6a (supports shielded cables).

Plus: optimal price/quality ratio (RUB 3,000–5,000).

3. HT Instruments (Italy)

Budget professional tool. Model HT-768 suitable for:

  • πŸ”Ή Automotive terminals (Faston 4.8/6.3 mm).
  • πŸ”Ή Shell for heat shrink.
  • πŸ”Ή Coaxial F-connectors.

Price: 2,500–4,000 RUR.

4. Weicon (Germany)

Manufactures presses for industrial applications, including automotive electronics. Model Weicon Crimpfox 6 equipped with:

  • πŸ”Ή Adjustable crimp force (suitable for delicate connectors).
  • πŸ”Ή A set of matrices for Deutsch DT and Molex Mini-Fit.

5. IEK (Russia/China)

Budget option for one-time jobs. Model IEK PK-16 suitable for crimping RJ45, but not recommended for automotive wiring due to low accuracy.

⚠️ Attention: Crimpers IEK and Stayer often counterfeited. Check the packaging for the hologram and serial number. Counterfeits may break after 10–20 crimps.
πŸ’‘

When purchasing a crimper, check whether the kit includes spare dies. For example, at Knipex 97 53 01 they are sold separately (~2,000 β‚½ per set).

Step-by-step instructions: how to crimp a cable correctly

Even an expensive crimper will not save you from mistakes if you do not follow the technology. Let's look at the process using crimping as an example. RJ45 (network cable) and car terminal Faston 6.3 mm.

Crimping RJ45 (twisted pair)

  1. Stripping the cable: Remove 2-3 cm of outer insulation with a stripper (not a knife!). Unbraid the strands and align them according to the color scheme (T568B or T568A).
  2. Core trimming: Trim the ends with wire cutters - they should be at the same level.
  3. Insert into connector: Pass the wires through RJ45 all the way (the insulation should go under the clamp).
  4. Crimping: Place the connector into the crimper die and squeeze the handles until you hear a click.

All 8 cores are visible in the connector|No gaps between the connector and the insulation|Contacts do not protrude beyond the edge|Resistance between cores < 0.1 Ohm (checked with a multimeter)

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Faston Automotive Terminal Crimping

  1. Wire stripping: Remove 5–7 mm of insulation without damaging the wires. For stranded wires, twist the ends.
  2. Matrix selection: Install a nozzle into the crimper that matches the size of the terminal (for example, 6.3 mm for Faston).
  3. Positioning: Insert the terminal into the matrix so that the wire insulation rests against the stopper.
  4. Crimping: Squeeze the handles smoothly, without jerking. A correctly crimped terminal should not rotate on the wire.

To check crimp quality:

  • πŸ”Ή Pull the wire to the side - the terminal should not move.
  • πŸ”Ή Measure the resistance between the end of the wire and the terminal (should be < 0.05 Ohm).
What to do if the terminal dangles after crimping?

If the terminal Faston or Deutsch scrolls on the wire, it means:

1. Insufficient crimping force (check crimper setting).

2. The matrix was selected incorrectly (for example, you used a nozzle for 4.8 mm instead of 6.3 mm).

3. The wire is too thin for this terminal (an adapter sleeve is needed).

Solution: Trim the terminal and repeat crimping with the correct socket. If the problem recurs, replace the crimper (the dies may be worn out).

Common mistakes and how to avoid them

Crimping errors lead to two problems: bad contact (overheating, signal interruptions) or short circuit (if the wires touch). Let's look at typical mistakes:

1. Incorrect wire stripping

If you remove too little insulation, the wires will not reach the end of the connector. If there are too many, exposed wires can short out. Optimal stripping length:

  • πŸ”Ή For RJ45: 12–14 mm (so that the insulation goes under the clamp).
  • πŸ”Ή For car terminals: 5–7 mm (so that the sleeve covers the entire exposed part).

2. Twisting of wires

In network cables Cat5e/Cat6 The wires are twisted in pairs to reduce interference. If they are unraveled by more than 1.5 cm, the signal will deteriorate. Rule: Unravel only the part that will be inside the connector.

3. Using the wrong matrix

For example, crimping a terminal Deutsch DT matrix for Faston will lead to:

  • ❌ Deformation of the connector.
  • ❌ Loose contact.
  • ❌ Breakage of the crimper (if the matrix is too small).

4. Ignoring the color scheme

In network cables, the order of the cores is important to the data transfer speed. If you confuse T568A and T568B, the cable will operate at speed 100 Mbit/s instead of 1 Gbit/s.

In automotive wiring, color errors lead to:

  • ⚑ Polarity reversal (for example, plus to ground).
  • πŸ”₯ Fuses blown.
  • πŸš— ECU malfunctions (for example, error P0562 β€” low voltage on-board network).
⚠️ Attention: In vehicles with CAN bus (for example, Volkswagen MQB, Toyota TNGA) incorrect crimping of sensor connectors can cause errors U0100 (loss of communication with the ECU). In such cases, diagnostics with a scanner is required (Launch X431, Autel MaxiCOM).

How to choose a crimper for specific tasks

There is no universal crimper - the tool is selected according to the type of work. Let's look at recommendations for different scenarios:

1. For automotive wiring

Needed:

  • πŸ”§ Crimper with replaceable dies under Faston (4.8/6.3 mm), Deutsch (DT, DTM), Molex.
  • πŸ”§Additional: crimping tool ling-shin (for example, Knipex 97 42 03).

Recommended models:

  • HT-768 (budget option).
  • Weicon Crimpfox 6 (for delicate connectors).

2. For network cables (RJ45)

Key Requirements:

  • 🌐 Support Cat6a/Cat7 (if you are compressing gigabit networks).
  • 🌐 Automatic handle return (speeds up work).

Best models:

  • Jonard CT-725 (for shielded cables).
  • Knipex 97 53 180 (for RJ45 and RJ12).

3. For power cables (batteries, charging stations)

A hydraulic press with a force of 10 tons is required. Examples:

  • ⚑ Hydraulic Crimper HT-900 (for terminals Type 35–70).
  • ⚑ Knipex 97 54 04 (for cables with a cross-section of up to 300 mmΒ²).

4. For audio/video equipment

Specialized crimpers are needed for:

  • 🎡 XLR (microphone cables).
  • πŸ“Ί F-connectors (antenna cables).
  • 🎧 Speakon (acoustic systems).

Recommendation: Paladin Tools PA-1260 (universal for audio connectors).

πŸ’‘

For automotive wiring, the priority is crimping accuracy rather than speed. Better to overpay for Knipex or Weiconrather than risk a short circuit due to a cheap tool.

Crimper care: how to extend its service life

Even an expensive tool will fail if you do not follow the operating instructions. Basic recommendations:

1. Cleaning after work

Remove any remaining copper and insulation from the matrices with a dry cloth. For dried mud use:

  • 🧴 Special cleaner (WD-40 Specialist Contact Cleaner).
  • 🧴 Isopropyl alcohol (70% concentration).

Do not use acetone or gasoline - they destroy the anti-corrosion coating.

2. Lubricate the mechanism

Once every 6 months, apply crimper to the joints:

  • πŸ›’οΈ Litol-24 (for mechanical presses).
  • πŸ›’οΈ Lubricant Molykote (for hydraulic models).

3. Storage

Observe the conditions:

  • πŸ“¦ Dry place (humidity < 60%).
  • πŸ“¦ Temperature: from –10Β°C to +40Β°C.
  • πŸ“¦ Dust protection (cover or case).

4. Accuracy check

Test the crimper once a year:

  1. Crimp the test terminal.
  2. Measure the resistance between the wire and the connector (should be < 0.05 ohm).
  3. Check visually: there are no cracks on the matrix.
⚠️ Attention: If the crimper begins to β€œchew” the insulation or leaves dents on the connector, this is a sign of wear on the matrices. Continuing to work will lead to failure of all crimps.

FAQ: Frequently asked questions about crimping presses

Is it possible to crimp RJ45 with pliers?

Technically yes, but:

  • πŸ”Ή The contacts will be compressed unevenly β†’ high resistance.
  • πŸ”Ή Risk of damage to the plastic connector retainer.
  • πŸ”ΉIn network cables Cat6 this will lead to a drop in speed to 100 Mbit/s.

Conclusion: For emergency repairs only. For regular use, buy a crimper for 1,000–2,000 rubles.

What crimper is needed to crimp battery terminals?

For terminals type Type 35 or Type 50 required hydraulic press with a force of 10 tons. Popular models:

  • Hydraulic Crimper HT-900 (up to 70 mmΒ²).
  • Knipex 97 54 04 (up to 300 mmΒ²).

For crimping NShVI tips a hand press will do IEK PK-16, but only for cables with a cross-section of up to 10 mmΒ².

What is the difference between dies for Faston 4.8 mm and 6.3 mm?

The size of the matrix must exactly match the width of the terminal:

  • 4.8 mm - for thin wires (for example, in ABS sensors).
  • 6.3 mm β€” for power circuits (for example, radiator fan).

If you use the matrix 6.3 mm for terminal 4.8 mm, the contact will be unreliable. The opposite situation will lead to terminal deformation.

Do I need to solder the wires after crimping?

In 90% of cases no. High-quality crimping ensures:

  • πŸ”Ή Reliable contact (resistance < 0.05 Ohm).
  • πŸ”Ή Vibration resistance (important for a car).
  • πŸ”Ή Tightness (if heat shrink is used).

Soldering is only needed in two cases:

  1. For aluminum wires (crimping does not guarantee durability).
  2. B high-end audio systems (for example, Burmester) where minimal resistance is required.
How to check the quality of crimping with a multimeter?

Check procedure:

  1. Switch the multimeter to resistance measurement mode (200 Ξ©).
  2. Connect the test leads to the two ends of the crimped wire.
  3. There must be resistance < 0.1 Ξ© for network cables and < 0.05 Ξ© for automotive terminals.
  4. Check that there is no short circuit between adjacent contacts (resistance = ∞).

For RJ45 also use cable tester (for example, Fluke Networks MicroScanner2) to check the pinout is correct.