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Black rubber cold shrink tube, 0.65 in ID, 2.75 in long

3M

3M QI-5/16-220 Cold Shrink Tube 0.65 in ID

SKU CH-WCEE-4C8BE

Medium-wall EPDM rubber tube insulates 8 AWG to 2/0 AWG wire, shrinking from 0.65 in to 0.2 in ID over a 2.75 in length with 365 V dielectric strength

  • Medium-wall EPDM rubber resists acids and alkalis
  • Cold-shrink design installs without heat tools
  • Fits 8 AWG to 2/0 AWG wire sizes
  • Operates from -40 °F to 194 °F
  • 365 V dielectric strength insulates reliably

Cold Shrink Tube for 8 AWG to 2/0 AWG

The 3M QI-5/16-220 is a medium-wall cold shrink tube made from EPDM rubber. It is designed for electricians who need to insulate or splice cables without using a heat gun. The tube arrives pre-expanded on a removable core and contracts when the core is pulled. It suits maintenance and field repairs where open flame or hot tools are impractical.

0.65 in ID Fits 8 AWG to 2/0 AWG

The critical specification is the expanded inner diameter of 0.65 in, which shrinks down to 0.2 in after core removal. This range covers wire sizes from 8 AWG up to 2/0 AWG. Selecting the correct tube depends on matching this diameter to the cable or connector being insulated. An incorrect diameter will prevent a reliable seal.

Withstands -40 to 194 Degrees F Continuously

The EPDM rubber operates across a temperature range of -40 to 194 degrees F. It resists acids and alkalis during prolonged exposure. The material carries a dielectric strength of 365 V and is not flame retardant. These properties mean the insulation remains stable under sustained thermal and chemical stress rather than only during brief peaks.

How it compares

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Price $32.99
Cheaper than about 85% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

What does the 0.65 in inside diameter mean when the tube is on a cable?

The tube ships at 0.65 in ID and shrinks down to 0.2 in, so it will grip cables from 8 AWG up to 2/0 AWG once the core is removed.

How does the 365 V dielectric strength limit what the tube can insulate?

The 365 V rating means the EPDM rubber wall is tested for low-voltage work only; do not use it on circuits that exceed that level.

What spacing does the 2.75 in length need on a splice?

Each piece covers 2.75 in, so plan at least that much straight cable for the tube to sit flat after shrinking.

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