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Black EPDM rubber cold shrink tube, 4.5 inches long, 1.45 inch inner diameter before shrinking

3M

3M QI-10/37-270 Cold Shrink Tube Medium Wall electrician tool

SKU CH-H8RR-MSYQ5

Medium-wall EPDM rubber cold-shrink tube insulates 2 AWG to 750 MCM wire, shrinking from 1.45 in to .4 in over 4.5 in length

  • EPDM rubber resists acids and alkalis across harsh environments
  • Cold-shrink design installs quickly without heat tools or open flame
  • Insulates wire sizes from 2 AWG up to 750 MCM reliably
  • Operates continuously from -40 to 194 degrees F in extreme conditions
  • Dielectric strength of 365 V protects electrical connections effectively

Cold Shrink Tube for Medium-Voltage Splices

The 3M QI-10/37-270 is a cold shrink quick insulator made from EPDM rubber for electrical splicing and termination work. It installs without heat tools, expanding over the joint and contracting to form a tight seal. The medium-wall design suits wire sizes from 2 AWG to 750 MCM. Electricians and maintenance crews use it for reliable insulation in the field.

Shrink Ratio Not Rated with Fixed Dimensions

This tube has a pre-shrink inner diameter of 1.45 in and a recovered inner diameter of 0.4 in after installation. The shrink ratio is not rated by the manufacturer, so the final fit depends on the cable diameter falling within the stated wire-size range. Installers must verify the conductor size matches the 2 AWG to 750 MCM specification before use. No heat source is required for activation.

Acid and Alkali Resistance for Harsh Environments

The EPDM rubber material resists acids and alkalis, extending service life in chemically exposed locations. It operates across a temperature range of -40 to 194 degrees F and provides a dielectric strength of 365 V. The tube is not flame retardant and has no adhesive lining, so it relies on radial compression alone for sealing. Each piece measures 4.5 in long and is sold individually.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $42.99
Cheaper than about 81% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

How much insulation does the 0.4 in. final diameter actually cover on a 2 AWG conductor?

The tube shrinks from 1.45 in. to 0.4 in., sealing a 4.5 in. length of cable from 2 AWG up to 750 MCM with medium-wall EPDM rubber.

What does the 365 V dielectric strength limit in a 194 °F environment?

It rates the maximum voltage the EPDM wall can withstand continuously at the upper temperature bound of -40 °F to 194 °F.

What clearance is needed to slide the 1.45 in. tube over a splice before shrinking?

The expanded 1.45 in. inner diameter fits over the joint, then shrinks to 0.4 in. without tools or heat.

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