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Black thin-wall heat-shrink tube, 4 ft length, 3:1 shrink ratio

3M

3M SFTW-203-1/2-48-BLACK Heat Shrink Tube Thin Wall 3:1 Ratio Black 4 ft

SKU CH-672A-F1N62

Thin-wall polyolefin tubing shrinks 3:1 to 0.16 in. for 6–1 AWG wires, resists acid and alkali, and withstands –67 °F to 275 °F

  • Fits 6 AWG to 1 AWG wire with 0.47 in pre-shrink diameter
  • Shrinks to 0.16 in inside diameter at 3:1 ratio for tight seal
  • Thin 0.03 in wall stays very flexible after shrinking
  • Withstands -67 °F to 275 °F and resists acid and alkali
  • Flame-retardant polyolefin rated to 600 V dielectric strength

Thin-wall heat-shrink tubing

3M SFTW-203-1/2-48-BLACK is a thin-wall polyolefin tube with a 3:1 shrink ratio. It fits wire sizes from 6 AWG to 1 AWG and comes in a four-foot black length. The tubing is very flexible and flame-retardant without an adhesive lining. It suits general electrical insulation and strain relief.

Sustained thermal and chemical resistance

The material withstands continuous temperatures from -67 to 275 degrees F and resists acid and alkali exposure. Minimum shrink temperature is 212 degrees F, and the recovered wall measures .03 inches thick. Dielectric strength is rated at 600 V for reliable insulation under load. Performance remains stable across the full temperature range.

Replaces larger-ratio or adhesive-lined tubing

This product upgrades from 2:1 ratio tubing when a wider range of wire diameters must be covered with one size. It is not for buyers who need an adhesive seal or a heavier wall for abrasion protection. The 3:1 ratio reduces inventory by covering 6 AWG through 1 AWG with a single SKU.

How it compares

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

Price $46.99
Cheaper than about 80% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

How much heat does the 3M SFTW-203 tubing need to reach its minimum shrink temperature of 212 degrees F?

The minimum shrink temperature is 212 degrees F. A standard heat gun on a low setting will reach this quickly; the thin wall and 3:1 ratio mean the tube recovers fully in seconds without overheating the wire underneath.

What wire gauges can I use with the 0.47 in inside diameter before shrinking?

The tubing is rated for use with wire sizes 6 AWG to 1 AWG. The 0.47 in expanded I.D. slides over the insulation easily, then shrinks to 0.16 in for a tight seal.

Will the 600 V dielectric strength protect splices on older 12 V automotive circuits?

Yes. The 600 V dielectric strength far exceeds 12 V system requirements. The polyolefin material is acid and alkali resistant and flame retardant, so it withstands harsh under-hood conditions.

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