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Red nylon butt splice connector, cylindrical, tin-plated copper body

3M

3M MNG18BCX Butt Splice Wire Connector 18 AWG Red Nylon 600V

SKU CH-7NAS-MM85R

Crimp butt splice joins 22 to 18 AWG wires with seamless tin-plated copper barrel and red nylon insulation rated to 600 V and 221 °F

  • TypeElectrical Connectors
  • Crimp connection creates secure joints without soldering
  • Red nylon insulation identifies 18 AWG maximum wire size
  • UL listed and CSA certified for code-compliant installations
  • Seamless tin-plated copper barrel resists corrosion at 600 V
  • RoHS compliant materials meet environmental regulations

18 AWG Butt Splice Connector

This red nylon-insulated butt splice accepts solid or stranded copper conductors from 22 AWG up to 18 AWG. It is designed for automotive, marine and general low-voltage wiring repairs where a reliable crimp connection is required. The seamless barrel and tin-plated copper body provide consistent conductivity and corrosion resistance.

600 V Crimp Terminal Limits

The connector is rated for a maximum of 600 volts and an operating temperature ceiling of 221 degrees Fahrenheit. It carries UL Listing and CSA certification, confirming compliance with North American safety standards for the stated voltage and temperature range. The nylon insulation maintains dielectric strength within these limits but is not rated for higher voltages or temperatures beyond the certified values.

Seamless Barrel Installation

A standard crimp tool sized for 18 to 22 AWG terminals compresses the seamless barrel around the stripped conductor ends. The 0.07 inch barrel inside diameter matches the wire range, so over-crimping or using undersized wire can reduce mechanical grip. Ensure the insulation is stripped to the correct length and the crimp is centred on the barrel to avoid loose connections or insulation damage.

Highlights

  • Crimp connection creates secure joints without soldering
  • Red nylon insulation identifies 18 AWG maximum wire size
  • UL listed and CSA certified for code-compliant installations
  • Seamless tin-plated copper barrel resists corrosion at 600 V
  • RoHS compliant materials meet environmental regulations

Specifications

Brand3M
TypeElectrical Connectors

Questions about this item

Should I pick the 18 AWG red splice or a different colour for my wire gauge?

The red colour identifies the 18 AWG maximum wire size; choose this splice when your conductors fall between 22 AWG and 18 AWG.

What does the 600 V rating mean once the connector is crimped in my harness?

It certifies the nylon-insulated brass barrel for continuous operation up to 600 volts in approved circuits.

How does the crimp termination and seamless barrel affect the connection?

The seamless tin-plated copper barrel with a 0.07 in inside diameter provides a uniform crimp around 18 to 22 AWG wire for reliable conductivity.

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