We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Blue cylindrical butt splice connector with heat-shrink polyolefin insulation

3M

3M MH14BCX Butt Splice Connector 14 AWG Blue Polyolefin

SKU CH-GR1T-2HB9M

Blue polyolefin heat-shrink butt splice crimps 16 to 14 AWG copper wires at 600 V and 221 °F

  • TypeElectrical Connectors
  • Fits 14 AWG wires with secure crimp connection
  • Heat-shrink polyolefin insulation seals out moisture
  • UL and CSA listed for 600 V applications
  • Tin-plated copper barrel resists corrosion
  • Compact 1.3 in length fits tight spaces

3M MH14BCX Butt Splice Connector

This 3M butt splice connector accepts 14 AWG to 16 AWG copper wires with a crimp termination. Blue polyolefin heat-shrink insulation provides environmental sealing after heating. The tin-plated copper alloy barrel ensures reliable conductivity for automotive or industrial wiring repairs. Rated for 600 V maximum voltage.

Wire gauge and crimp tool check

Verify your conductors fall within the 14 AWG maximum and 16 AWG minimum range before ordering. A proper crimp tool matching the barrel inside diameter of 0.095 in is required for a secure mechanical and electrical joint. The connector carries CSA and UL certifications and is RoHS compliant. No UL 94 flammability rating applies.

Thermal and electrical limits

Maximum operating temperature is 221 Degrees F under the 600 V rating. Polyolefin insulation shrinks uniformly when heated, creating a moisture-resistant seal without open flame. The butted seam design and tin-plated copper contacts maintain low resistance during normal current flow. Overall length is 1.3 in for tight routing.

Highlights

  • Fits 14 AWG wires with secure crimp connection
  • Heat-shrink polyolefin insulation seals out moisture
  • UL and CSA listed for 600 V applications
  • Tin-plated copper barrel resists corrosion
  • Compact 1.3 in length fits tight spaces

Specifications

Brand3M
TypeElectrical Connectors

Questions about this item

What comes in the package and do I need a separate crimp tool?

The connector is supplied as a single heat-shrink butt splice with blue polyolefin insulation; a compatible crimp tool for 14-16 AWG terminals must be purchased separately.

Should I choose this blue 14 AWG version or a different size for my 16 AWG wire?

This blue model accepts 16 AWG to 14 AWG conductors; select it when your wire falls in that range, otherwise choose the splice colour-coded for the gauge you are using.

What does the 600 V / 221 °F rating mean once the splice is crimped and shrunk in my harness?

After proper crimping and heat-shrink activation the joint is rated for continuous operation up to 600 volts and 221 degrees Fahrenheit per the UL and CSA listings.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.