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Red heat-shrink butt splice connector, 1.2 in long

3M

3M MH18BCX Butt Splice Connector 18 AWG Red Polyolefin

SKU CH-VJMR-CHMVV

Heat-shrink butt splice joins 22–18 AWG wires with a crimp, rated 600 V and 221 °F

  • TypeElectrical Connectors
  • Handles 18 AWG wire for secure automotive connections
  • Heat-shrink polyolefin insulation seals out moisture and vibration
  • Tin-plated copper barrel ensures low-resistance crimp joints
  • UL and CSA listed for 600 V safety compliance
  • Compact 1.2 in length fits tight harness spaces

3M MH18BCX 18 AWG Butt Splice

The 3M MH18BCX is a crimp-style butt splice connector designed for 18 AWG maximum wire size. It features a copper alloy body with tin-plated copper contacts and heat-shrink polyolefin insulation. The connector accepts wires from 22 AWG up to 18 AWG and is rated for 600 V maximum voltage.

Suited for small-gauge crimp splices

This connector suits installers making inline splices on 18 to 22 AWG conductors where a heat-shrink seal is required. It is not for buyers needing a larger wire range above 18 AWG or a non-insulated barrel for separate sleeving. It also does not serve applications that demand a higher temperature rating than 221 degrees F.

Handles 18 to 22 AWG at 600 V

The barrel inside diameter of .062 in accommodates the stated wire range with a 1.2 in overall length. It provides a sealed, UL and CSA listed connection up to the 600 V and 221 degrees F limits. Headroom ends at the 18 AWG maximum; thicker conductors or higher voltage needs require a different connector.

Highlights

  • Handles 18 AWG wire for secure automotive connections
  • Heat-shrink polyolefin insulation seals out moisture and vibration
  • Tin-plated copper barrel ensures low-resistance crimp joints
  • UL and CSA listed for 600 V safety compliance
  • Compact 1.2 in length fits tight harness spaces

Specifications

Brand3M
TypeElectrical Connectors

Questions about this item

What minimum wire gauge must I already have to use the 22 AWG lower limit of this connector?

The connector accepts wire down to 22 AWG, so you need conductors of 22 AWG or larger to make a proper crimp.

Will the .062 in barrel inside diameter accept the solid-core hook-up wire I keep from older projects?

The barrel inside diameter is .062 in, which matches 18 AWG maximum; check your older wire gauge against that limit before crimping.

How can I confirm the heat-shrink insulation has sealed correctly after crimping?

Apply heat until the polyolefin tubing shrinks tightly around the joint and the adhesive liner flows, forming a uniform seal along the 1.2 in length.

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