Wire Connectors

Splice two or more wires together safely and securely

Wire Connectors

Wire connectors are fasteners used to make a tight connection between two or more electrical wires. Made of flame-retardant materials, wire connectors prevent wires from contacting other wires or exposed metal surfaces, which could cause a dangerous fault or short circuit.

Wire connectors are easy to use, function in a variety of ways for different uses, and in most cases don’t require any special tools.

This guide will explain the different types of wire connectors, so you can feel confident you’re choosing the right connectors for your project.

Design and Materials

Most wire connectors have a thermoplastic, fire-retardant shell over a square-wire spring. When twisted, the spring expands, creating inward pressure that splices the wire together in a tight connection.

Some plastic wire connectors do not have a metal coil center and depend on grooves inside to twist the wires together.

Tip: When twisting on the wire connector, remember that the tighter the twist, the stronger the splice. Be careful not to over-tighten.

Twist-on wire

  • Don’t require pre-twisting wires
  • Sweat


  • Ideal for fast, easy connections
  • Don’t slip over time

Twist-on winged connectors

  • Wings provide extra twisting leverage
  • Easy installation and removal

Twist-on grounding wire connectors

  • Designed for making ground connections and bonding non-metallic sheathed cable

Crimp-on wire connectors

  • Secure in place with a crimping tool
  • Serve as a suitable replacement for soldered connectors, but may not be as strong

Underground wire connectors

  • Used in areas exposed to rain, moisture, condensation, high humidity, or other corrosive elements
  • Ideal for buried wire

Waterproof wire Connectors

  • Suited for wire splices exposed to condensation, water, vapors or dust

Push-in wire connectors

  • Alternative to twisting wires together
  • Has the wires pushed into two to four holes sized for various wire gauges

Wire connectors designed to withstand high temperatures can be made of ceramic. These connectors typically do not have a metal core. Instead they rely on internally formed concentric grooves to provide the electrical connection when the conductors are inserted and then twisted together.


Wire connectors are color-coded by size according to the minimum and maximum number of wires they can safely connect.

Colors are usually orange, yellow, red and green.

Check that the connector you are using fits the quantity and gauge of wire you’re connecting.

Wire Connectors