3M 8429-12 Cold Shrink Connector Insulators
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Manufacturer 3M
Mfg Catalog # 8429-12
NorthEast Part # 388216


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 1.27 - 2.67 in (32,2 - 67,8 mm)
  • Accommodates 900 to 1000 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: 80610921910
  • Applications: Insulation, mechanical protection, repair
  • Brand: 3M
  • Case Quantity: 10
  • Color: Black
  • Conductor Material: Aluminum, Copper
  • Conductor Sizes: 1000 kcmil, 900 kcmil
  • Inner Diameter After Heat-Shrink: 21.3 mm
  • Inner Diameter Before Heat-Shrink: 72.4 mm
  • Length (Metric): 305 mm
  • Material: EPDM-rubber
  • Maximum Connector Length: 8.0 in
  • Maximum Connector Length (metric): 203.2 mm
  • Maximum Wire Gauge: 67.8mm²
  • Minimum Wire Gauge: 32.2mm²
  • Number of Conductors: 1
  • Operating Temperature (Celsius): -40 up to +90°C
  • Product Type: Cold shrinking
  • RoHS 2011/65/EU Compliant: Yes
  • RoHS EU Comments: RoHS 2011/65/EU compliant without exemption
  • Shielding Type: Tape Shield, UniShield®, Wire Shield
  • Shrink Ratio: 2:1
  • 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 05400742389
Product Description 3M Cold Shrink Connector Insulators 8420 and 8430 Series are designed using 3Ms proprietary cold shrink delivery system. Products are supplied prestretched on a removable core for efficiency and ease of installation. Removal of the core (unwinding) after positioning the splice allows the product to shrink into position forming a moisture-tight seal. The live memory action of the specially formulated EPDM material promotes a permanent, durable environmental seal and insulation, with a typical operating temperature range from -40194°F (-4090°C).The 8420 insulator meets requirements of ANSI C119-1 and Western Underground Guide 2.14 for secondary splices rated up to 1 kV.Applications: Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable splicing rated to 1000 V. Good for repairs and environmental sealing for communication and other non-electrical applications.Important: Use insulation jacket or connector O.D. for final ordering criteria.* Mastic pads included for cable O.D. build-up. ** Kit contains adapters. *** These sizes are listed for availability only and are not designed to be usedas primary insulation. These tubes are for conduit sealing and breakouts. ****Maximum connector length: 5.625Point of Purchase packaging designated by P. Example: 8423-6P
GTiN 00054007423898
Size 1000 kcmil; 900 kcmil
Type Cold Shrink Splice
Material EPDM-rubber
Number of Conductors 1
Cable Type Power Cable
Family Brand Name 3M
Length 305 mm
Color Black
Voltage 1 kV
Splice Type Cold Shrink
Product Type Cold Shrinking
Conductor Size 900 MCM

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