If you want to join cables and connectors safely, you need to understand crimping first.

Crimping joins connectors and cables by compressing metal parts together to create a secure, long-lasting electrical bond.

In this guide, you will learn what crimping is and which type of crimping tools you need to get your job done.

What is crimping and what is a crimping tools?

Crimping joins metal or flexible materials by pressing and reshaping one or both pieces to lock them together. The resulting deformation is called the crimp, while the tool that creates it is the crimping tools.

In electrical applications, this joining method connects wires or secures wire to connectors. The metal connectors used—typically called crimp connectors—feature an insulated sleeve attached to a metal contact.

A crimping tool compresses a metal connector around a wire to form a strong bond. This sealed connection prevents moisture and gas from entering, which stops electrical corrosion and connection failures. The result is a solderless link that electricians can form between two wires or at the end of a wire strand.

Beyond electrical work, crimping appears across manufacturing sectors. Engineers and mechanics use this technique on various materials and applications.

How to use a crimping tools

To crimp a connection, you need four basics: the wire, a matching connector, a wire stripper, and a crimping tool. Many guides also recommend checking that the connector size matches the wire gauge for a reliable joint.​

Follow these steps:

• Strip a short length of insulation from the end of the wire so the bare conductor fits fully inside the connector barrel. A wire stripper makes this quick and avoids damaging the strands.​
• Twist the exposed strands so they stay together and slide smoothly into the connector.
• Place the connector in the correct nest of the crimping tool and hold it lightly in place. Some tools let you lock the connector in the die before adding the wire, which helps alignment.​
• Push the stripped wire into the connector, then squeeze the handles firmly until the crimp is complete. With a ratcheting crimp tool, the mechanism releases automatically once enough pressure is applied, so you do not need to guess the force.​

After crimping, pull on the wire and connector to check the joint. A weak crimp that pulls apart during testing should be redone before the connection is installed.​

What types of crimping tool are there?

Different applications call for different crimping tools. Each type handles specific connectors and wire sizes.​

Bootlace crimping tools

Bootlace ferrules are metal tubes with color-coded insulation sleeves that prevent stranded wire from fraying when inserted into screw terminals. High-leverage versions reduce hand fatigue during repeated use. Plier-style bootlace crimpers accommodate a wider range of wire gauges than single-size models, making them more versatile for general electrical work.​

Thin cable precision crimping tools

Small-gauge wires leave little room for mistake. Manual hand crimpers can crush or misalign delicate strands. Ratcheting crimpers solve this problem by applying consistent, controlled pressure automatically. The ratchet releases once the correct force is reached, eliminating guesswork and producing uniform results every time.

Crimping tool for QM & IP68 connectors

QM and IP68 connectors work well for mains control leads and compact transmission systems. These specialized tools are sized to handle QM connectors up to 24 AWG and IP68 connectors up to 28 AWG, offering flexibility across different connector standards.

Crimping tool for splice connectors

Splice connectors—whether gel-filled or butt-splice types—require dedicated tools. Generic crimpers can damage these connectors or create weak joints. Dedicated splice crimpers feature spring-loaded handles and precise dies matched to specific connector geometries.

Crimping tool for coaxial cable

Coaxial cables carry high-frequency signals like broadband and television feeds. Their shielded construction makes standard crimping difficult. Tool selection depends on cable impedance: 75 Ω for television and video cables, or 50 Ω for RF and data transmission lines. Using a tool mismatched to your cable’s impedance compromises signal integrity.

Can you crimp wires with pliers?

Pliers cannot create a proper electrical crimp. While a pair of pliers can crush a connector onto wire, this produces a weak, unreliable connection—not a true cold weld. Regular pliers apply uneven pressure that fails to compress the connector barrel uniformly around the wire strands.

A defective crimp allows air and moisture to penetrate the joint, causing oxidation and electrical resistance that leads to failure. The connection will collapse under the pull test and fail when voltage or vibration stress is applied. Ratcheting crimping tools have engineered dies that apply precise, consistent pressure in the correct geometry, which regular pliers cannot match.

For safe, lasting electrical connections, use a dedicated crimping tool matched to your connector and wire size. The small investment in the right tool prevents connection failures, safety hazards, and wasted time troubleshooting problems later.

Which is the best crimping tool?

JiaPaiMi crimping tools are often the best option for most crimping jobs. They are designed around specific connector types, so each tool matches the size and shape of the crimp for a precise fit.

These tools are engineered and made inchina to deliver strong, repeatable joints. High-leverage handles mean you use less force to achieve a secure crimp, reducing hand fatigue during regular use.

Is it better to crimp or solder?

Crimping provides stronger and more reliable connections than soldering for most applications. Solder degrades over time as the filler metal corrodes, especially in environments with vibration, moisture, or temperature extremes.

Crimping creates an airtight seal that protects wires from moisture, dust, and corrosion. When done properly, it forms a “cold weld” where metal surfaces compress together under pressure, resulting in excellent electrical conductivity and mechanical strength.

Crimping is also faster and simpler to perform, especially in difficult locations like ceiling cavities or under floorboards where a soldering iron would be impractical or dangerous. A proper crimp requires no heat, eliminating the risk of damaging insulation or heat-sensitive materials. Additionally, adding solder to a crimp connection actually degrades it by introducing heat that weakens wire strands and can cause joint failure over time.

How do you undo a crimp?

Removing a crimp is extremely difficult and rarely produces a usable connection. While small screwdrivers or cutting tools can pry or force open a compressed connector, this process damages the metal barrel, making it impossible to achieve a reliable seal on a second crimp.

A re-crimped connector is inherently weak because the metal no longer compresses uniformly around the wire. The deformed barrel allows moisture and air to penetrate, leading to corrosion and eventual failure.

The practical solution is to cut the wire just below the unwanted crimp, strip fresh insulation from the shortened wire, and attach a new connector. If the wire becomes too short for your application, extend it with a splice connector using a fresh piece of wire. This approach is faster and more reliable than attempting to salvage the original crimp.

Conclusion

Crimping tools are essential for creating reliable electrical connections across homes, industries, and manufacturing settings. Understanding the right tool for your application—whether bootlace ferrules, precision tools for thin cables, or coaxial cable crimpers—ensures strong, lasting joints that won’t fail over time. Proper technique, from wire stripping through final inspection, separates professional results from connections that deteriorate under stress or moisture exposure.

Whether you’re working in tight spaces or on routine electrical projects, choosing the correct crimping tool and following best practices protects both your investment and safety. We’re here to help if you have further questions about crimping applications or tool selection.