Heat Shrink Tubing 2:1 – 1m Insulated Wire Cable Sleeve, 1–100mm ID, 7 Colors

Measure the outer diameter of your wire or connector before shrinking. Choose a tubing ID that is slightly larger than the unshrunk diameter — generally 10–20% larger. For example, a 4mm wire typically works well with 5mm or 6mm ID tubing. After heat is applied, the tubing shrinks to approximately half its original inner diameter at a 2:1 ratio.

Common inch equivalents for reference: 1mm ≈ 3/64", 6mm ≈ 1/4", 12mm ≈ 1/2", 25mm ≈ 1", 50mm ≈ 2".

This tubing uses a 2:1 shrink ratio, meaning it shrinks to approximately half its original inner diameter when heat is applied. For example, 10mm ID tubing will shrink to roughly 5mm ID after heating. This ratio is the most common for general-purpose insulated wire sleeve applications.

Polyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool. Avoid open flames, which can cause uneven shrinkage or scorching. Most standard heat guns with a low setting work well for smaller IDs; larger diameters may benefit from a higher airflow setting.

Standard polyolefin heat shrink tubing provides good electrical insulation and moderate moisture resistance, making it suitable for most indoor and protected outdoor wiring tasks — including automotive wiring harness repair and marine above-deck connections. For fully waterproof or submersion applications, an adhesive-lined (dual-wall) heat shrink tubing is generally recommended instead.

This tubing is compatible with a wide range of wire gauges and connector types. The 1–100mm ID range covers everything from fine signal wires (typically AWG 28–30 at the small end) up to large power cables and multi-pin connectors at the large end. Match the tubing ID to the outer diameter of your wire or connector for best results. The Transparent option is especially useful when you need to inspect the connection after shrinking.

Yes. Each piece is 1 meter (≈39.4") long and can be cut to any shorter length with scissors or a utility knife before or after shrinking. Cut ends remain clean and do not fray, making it easy to prepare multiple short sleeves from a single piece for connector insulation or wire splice work.

No. All seven color options — Black, Red, Yellow, Green, Blue, White, and Transparent — share the same polyolefin material and insulation characteristics. Color is used purely for visual identification, circuit labeling, or polarity coding. In automotive wiring, for example, Red is commonly used for positive leads and Black for ground, while Transparent allows visual inspection of the underlying connection.