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Black thin-wall heat-shrink tube 1.54 in ID shrinks to .51 in 3:1 ratio 4 ft length

3M

3M SFTW-203-1 1/2-48-BLACK Heat Shrink Tube

SKU CH-7ZMR-M7N6V

Thin-wall polyolefin tubing shrinks 3:1 from 1.54 in to 0.51 in, handles 600 V dielectric strength and temperatures from -67 to 275 °F, and comes in a 4 ft black length

  • Thin-wall polyolefin stays flexible after shrinking
  • 3:1 ratio covers 3/0 AWG to 400 MCM wires
  • Flame-retardant material resists acid and alkali exposure
  • Operates from -67 °F to 275 °F with 600 V dielectric strength
  • Shrinks at 212 °F to 0.51 in ID with 0.05 in wall

Thin-wall heat-shrink tubing for large cables

This 3M polyolefin tube shrinks at a 3:1 ratio to fit wire sizes from 3/0 AWG up to 400 MCM. It arrives with a 1.54 in inside diameter and recovers to 0.51 in after heating. The thin wall measures 0.05 in once shrunk and the length supplied is 4 ft.

Easy installation with a heat gun

Apply heat evenly until the tubing reaches the minimum shrink temperature of 212 degrees F and conforms tightly to the conductor. Uneven heating or insufficient temperature are the usual reasons the tube fails to recover fully. The material is very flexible and flame retardant, but it has no adhesive lining for environmental sealing.

Verify wire size and voltage rating before ordering

Confirm that your conductors fall within the 3/0 AWG to 400 MCM range so the 1.54 in starting diameter will slide over them. Check that the 600 V dielectric strength meets your circuit requirements. The operating temperature spans -67 degrees to 275 degrees F for reference.

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Price $100.99
Typical for this category: the median of 5,006 items is $95.99.

Specifications

Product
Brand name3M

Questions about this item

How can I verify the tubing has shrunk correctly after applying heat?

Measure the inside diameter — it should be approximately .51 in — and confirm the wall thickness is near .05 in; the tube should fit tightly over the wire without gaps.

What comes in the package and do I need any extra items to use it?

The package contains one 4 ft length of black polyolefin tubing; no adhesive liner is included, so you only need a heat source capable of reaching at least 212 Degrees F.

Which version suits a 400 MCM cable?

This SFTW-203-1 size covers wire sizes from 3/0 AWG up to 400 MCM with a 1.54 in pre-shrink diameter and 3:1 shrink ratio.

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