This section provides overview, applications, and principles of solderless terminals. Also, please take a look at the list of 98 solderless terminal manufacturers and their company rankings.
Crimp terminals are terminal materials used at the ends of wires. Crimping is a method of mechanically joining terminals and wires by plastic deformation using a tool or other means.
There are various sizes of crimp terminals depending on the thickness of the wire to be joined and the screw diameter of the terminal block. There are also multiple connection methods to the terminal block, such as screw-fastening and screw-in.
When connecting to a terminal block by screwing, there are various shapes of crimp terminals to choose from. Y-type and C-type terminals are easy to work with, but they may come loose if they are not tightened properly, so care must be taken.
Crimp terminals are used to connect terminal blocks and wires firmly.
In general homes, they are used for terminals for wiring between outdoor units and indoor units of air conditioners. They are not visible to the naked eye because contractors use them for finishing work.
In industrial applications, it is used in a wide range of applications, from communication wiring to power cables. They are mainly used for terminals when cables are used.
Incomplete crimping can occur due to the use of the wrong tool or work errors. Care must be taken because incomplete crimping can increase the contact resistance of the wire, which can lead to fire or other problems.
The fixing principle of crimp terminals is the plastic deformation of the wire terminals and crimp terminals. Once processed, the crimp cannot be undone, and in the event of failure, the wire terminal will be cut.
Crimp terminals have two parts: the barrel and the terminal. The barrel is the part that is connected to the wiring and is large enough to accommodate all of the specified wiring core wires. Both crimp terminals and wiring are made of flexible metal materials such as copper. They are firmly connected by matching and crushing them together with a crimping tool.
The terminal portion is the part used to connect to the control panel or control equipment. They are available in round, Y-shaped, rod-shaped, and other shapes and are selected according to the connection destination.
Crimping wire joints have a lower risk of detachment compared to joints using insulation tape or other means.
Crimp terminals are often used in Y- and round shapes, but only the round type meets the JIS standard. Therefore, when JIS standards are specified, the round type is often used. The round type has a nominal size, which must be selected according to the size of the screw of the terminal block.
Crimp terminals are classified into two major types: insulated crimp terminals and bare crimp terminals.
Insulated crimp terminals are crimp terminals with the barrel portion covered with an insulator. Since the insulation is already attached, there is no need for insulation treatment, and bending of the connection end can be prevented.
Bare crimp terminals are terminals without insulation in the barrel portion. The barrel portion after crimping is covered with an insulating cap or marked tube for insulation.
There are various types of crimp terminals with different tongue shapes, including the commonly used round type, C- and Y-shaped terminals, and Y-shaped terminals with claws.
Crimp terminal size is selected based on the cross-sectional area of the applicable wire and the size of the hole. The engraving on the crimp terminal indicates the shape (round, Y-shaped, etc.), the cross-sectional area of the applicable wire, and the nominal diameter of the screw portion (e.g., for a round terminal with an applicable wire of 5.5 mm2 and a nominal diameter of the screw portion, R5.5-6 is used).
Crimp terminals come in a variety of sizes, and if the size of the wire used and the nominal diameter of the screw do not match, a poor connection will result. Since a poor connection can cause a fire, it is essential to select the appropriate crimp terminal after checking the specifications.
Crimping pliers are used to crimping terminals and connect wires. Crimping pliers use the principle of leverage to crush the barrel portion. They are generally equipped with a ratchet function to prevent incomplete crimping.
Crimping pliers are used to crimp different objects depending on the color of the handle on the pliers. The color of the handle determines the application, and crimping pliers with red handles are used for crimping terminals.
Use the appropriate die (the groove part of the crimp) for the barrel portion of the crimp.
*Including some distributors, etc.
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