3M SFTW-203-1/4-48-BLACK Heat Shrink Tubing

Thin-wall heat-shrink tubing

3M SFTW-203-1/4-48-BLACK is a thin-wall polyolefin tube designed for electrical insulation and strain relief. It suits electricians and technicians who need flexible, flame-retardant protection for wire sizes 16 AWG to 12 AWG. The 3:1 shrink ratio allows the tube to fit over connectors before shrinking down to a tight seal. Supplied in individual 4 ft pieces, it is ready for immediate use.

Build quality and daily handling

The polyolefin material remains very flexible after shrinking, making it easy to route in tight bundles or around corners. Flame-retardant construction and acid- and alkali-resistant properties help the tubing withstand harsh environments. With a dielectric strength of 600 V and an operating range from -67 Degrees to 275 Degrees F, it maintains insulation integrity across wide temperature swings. The thin 0.03 in recovered wall adds minimal bulk to the harness.

Bundled format and practical impact

Each piece ships as a single 4 ft length, so users can cut exact lengths without managing a spool or off-cuts. The 0.24 in expanded inner diameter slides over typical splices and terminals for 16 AWG to 12 AWG wire, then shrinks to 0.08 in at a minimum temperature of 212 Degrees F. No adhesive liner is present, so the tube relies on mechanical grip rather than bonding. This suits repairs where re-entry or repositioning may be needed later.