3M 8427-12 Cold Shrink Connector Insulators
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Manufacturer 3M
Mfg Catalog # 8427-12
Crawford Part # 262


3M™ 8420 Cold Shrink Connector Insulator is an open-ended, tubular sleeve that provides ozone, acids and alkalis resistance. This environmental sealing insulator offers primary electrical insulation for 1 kV-rated applications. The tough, durable, EPDM rubber construction makes the insulator withstand operating temperatures of -40 to 194 degrees F (-40 to 90 degrees C).

3M™ 8420 Connector Insulator is designed for use on all solid dielectric insulated wires and cable splices. This cold shrink insulator offers moisture-tight sealing while maintaining its prolonged resiliency and pressure. It is ideal for insulating secondary splices, direct-buried or submersible, dig-in repairs and physical protection of high-voltage, air-insulated connectors or lugs. ANSI Certified and RoHS 2011/65/EU Compliant.

  • Specially designed for primary insulation of solid dielectric insulated wires and cable splicing rated to 1000 volts
  • Simple installation which requires no tools
  • Suitable for insulating secondary splices, direct-buried or submersible and dig-in repairs
  • Insulates cable or connectors within a diameter range of 0.67 - 1.38 in (16,8 - 35,1 mm)
  • Accommodates 250 to 400 kcmil conductor sizes
  • Made of EPDM rubber which contains no chlorides or sulfur
  • Withstands temperatures of -40 to 194 degrees F (-40 to 90 degrees C)
  • Environmental sealing for communication and other non-electrical applications
  • ANSI Certified and RoHS 2011/65/EU Compliant
  • 10/case


  • 3M ID: 80610134035
  • Applications: Insulation, mechanical protection, repair
  • Brand: 3M
  • Cable Type: Non-Shieled, Solid Dielectric Power Cable
  • Case Quantity: 10
  • Color: Black
  • Conductor Material: Aluminum, Copper
  • Conductor Sizes: 250 kcmil, 300 kcmil, 350 kcmil, 400 kcmil
  • Inner Diameter After Heat-Shrink: 16.8 mm
  • Inner Diameter Before Heat-Shrink: 35.1 mm
  • Length: 12 Inch
  • Length (Metric): 305 mm
  • Material: EPDM-rubber
  • Maximum Connector Length: 8.0 in
  • Maximum Connector Length (metric): 203.2 mm
  • Number of Conductors: 1
  • Product Type: Splice
  • RoHS 2011/65/EU Compliant: RoHS 2011/65/EU Compliant, Yes
  • RoHS EU Comments: RoHS 2011/65/EU compliant without exemption
  • Shielding Type: Non-shielded, Tape Shield, UniShield®, Wire Shield
  • Splice Type: Cold Shrink
  • Trademark: 3M
  • Voltage: 1 kV
  • Voltage Application: Low Voltage

Legal Disclaimer

  • Manufacturing Origin: USA
  • The designation that a product is Manufactured in the USA means the product undergoes substantial transformation in one of our U.S. Manufacturing plants. Some products contain imported components.
  • Note: 3M products offered on a government contract that require country of origin representation must be certified by 3M Trade Compliance. Contact customer service at 800-245-3573 to request a certificate.


UPC 05400734459
Product Description Quick and easy installation, no special tools and no heat requiredSeals tight, retains resiliency and pressureAccommodates a wide range of cable sizesResists acids, alkalis and ozoneNo mastic or tape required to seal
MDM Pkg GTiN 00054007344599
Length 12 in
Size 250 kcmil; 300 kcmil; 350 kcmil; 400 kcmil
Color Black
Voltage 1 kV
Type Cold Shrink Splice
Splice Type Cold Shrink
Material EPDM-rubber
Product Type Splice
Number of Conductors 1
Conductor Size 250 MCM
Cable Type Power Cable
Family Brand Name 3M
Max Operating Temperature 194 degrees F
Overall Length 12 in
Applications Insulation, Mechanical Protection, Repair

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