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3M 8427-12 Cold Shrink Connector Insulators

Manufacturer: 3M | Catalog # 8427-12 | Crawford Part # 262

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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

Technical Information

Insulation, Mechanical Protection, Repair
Cable Type
Power Cable
Conductor Size
250 MCM
Max Operating Temperature
194 degrees F
Number of Conductors
250 kcmil; 300 kcmil; 350 kcmil; 400 kcmil
Splice Type
Cold Shrink
Cold Shrink Splice
1 kV

Manufacturer Information

Family Brand Name

General Product Info

Product Type
Product UPC


12 Inch
Overall Length
12 in
  • Manufacturing Origin: USA
  • 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.
  • 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.
  • Specially designed for primary insulation of solid dielectric insulated wires and cable splicing rated to 1000 volts
  • ANSI Certified and RoHS 2011/65/EU Compliant
  • 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
  • Suitable for insulating secondary splices, direct-buried or submersible and dig-in repairs
  • Withstands temperatures of -40 to 194 degrees F (-40 to 90 degrees C)
  • Simple installation which requires no tools
  • 10/case
  • Made of EPDM rubber which contains no chlorides or sulfur
  • Environmental sealing for communication and other non-electrical applications
  • 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.
  • 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).