Heat Shrink Tubing 2:1 — Reliable Electrical Wire Insulation for Every Project
Whether you're repairing a frayed automotive harness, tidying up a home electrical panel, or protecting solder joints on a DIY electronics build, loose or exposed wiring is a safety hazard you can't ignore. Electricians, hobbyists, and automotive technicians all need a dependable heat shrink tubing solution that fits the wire, shrinks cleanly, and stays put — without hunting through a dozen separate listings to find the right size.
Each variant is a single color and diameter combination of 2:1 ratio polyolefin heat shrink tubing, available in diameters from Ø 1 mm (approx. 3/64") up to Ø 50 mm (approx. 2"), and in lengths of 1 m, 2 m, 4 m, 5 m, or 10 m. Colors available are Brown, Orange, Purple, Grey, and Yellow-green — useful for color-coding wire runs or matching existing harness conventions. The tubing is sold by the continuous metre length, cut to the selected option.
Typical use cases include automotive wiring harness repair and wire bundling, electrical panel wire management and connector insulation, DIY electronics projects requiring strain relief or solder joint protection, and marine or outdoor cable runs where moisture ingress needs to be minimized.
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Compatibility note: This tubing uses a standard 2:1 shrink ratio. Before ordering, measure the expanded (pre-shrink) outer diameter of your wire or connector and select a tubing size 10–20% larger. After shrinking, the recovered diameter will be approximately half the listed size. See the FAQ below for mm-to-inch conversion examples.
✅ Key Features of These Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Recovers to approximately half its expanded diameter, providing a snug, uniform fit over wires, connectors, and solder joints without gaps or bunching.
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📏Wide Diameter Range — Available from Ø 1 mm (approx. 3/64") to Ø 50 mm (approx. 2"), covering fine signal wires through large power cables and conduit bundles in a single product family.
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🎨5 Color Options — Brown, Orange, Purple, Grey, and Yellow-green allow color-coded wire identification, making it easier to trace circuits in automotive, marine, and panel wiring applications.
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🛡️Flame-Retardant Polyolefin Construction — Generally meets UL 224 or equivalent flame-retardant standards, providing electrical insulation and resistance to moisture, mild chemicals, and abrasion.
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✂️Sold by the Metre, Cut to Length — Choose 1 m, 2 m, 4 m, 5 m, or 10 m lengths so you buy only what your project requires, reducing waste on small repairs or stocking up for larger jobs.
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⚡Broad Application Compatibility — Fits standard copper and aluminum wire, butt connectors, ring terminals, and cable bundles — suitable for automotive wiring repair, DIY electronics, and general electrical sleeving tasks.
📐 Technical Specifications — Heat Shrink Tubing 2:1
| Shrink Ratio |
2:1 |
| Material |
Polyolefin (flame-retardant) |
| Available Colors |
Brown, Orange, Purple, Grey, Yellow-green |
| Expanded Diameter Range |
Ø 1 mm (approx. 3/64") — Ø 50 mm (approx. 2") |
| Available Lengths |
1 m (approx. 3.3 ft), 2 m (approx. 6.6 ft), 4 m (approx. 13.1 ft), 5 m (approx. 16.4 ft), 10 m (approx. 32.8 ft) |
| Typical Activation Temperature |
Approx. 90°C (194°F); full recovery at approx. 120°C (248°F) |
| Recommended Application Tool |
Heat gun (open flame not recommended) |
| Flame Retardancy |
Generally meets UL 224 or equivalent — confirm variant spec for critical applications |
| Typical Use |
Wire insulation, connector protection, cable bundling, solder joint strain relief |
| Wall Thickness (recovered) |
See variant options |
| Operating Temperature Range |
Contact us to confirm for specific variant |
| Country of Origin |
Contact us to confirm |
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Sizing tip: If you are between sizes, size up — it is easier to achieve a clean shrink with a slightly oversized tube than to force an undersized one over a connector. For connectors with a larger flange or boot, measure the widest point.
❓ Frequently Asked Questions
How do I choose the right diameter of heat shrink tubing?
Measure the outer diameter of the wire or connector you need to cover, then choose a tubing size whose expanded diameter is at least 10–20% larger than that measurement. After shrinking at a 2:1 ratio, the tubing will typically recover to roughly half its expanded diameter. For example, Ø 6 mm tubing generally shrinks down to approximately Ø 3 mm (approx. 1/8"). When in doubt, size up.
What does 2:1 shrink ratio mean?
A 2:1 shrink ratio means the tubing will shrink to approximately half its original expanded diameter when heat is applied. This is the most common ratio for general electrical insulation, wire bundling, and connector protection. It does not refer to length — the tubing generally does not shrink significantly in length during the process.
What temperature is needed to shrink this tubing, and what tool should I use?
Most 2:1 polyolefin heat shrink tubing typically activates at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low or medium is the recommended tool — move it steadily along the tubing to avoid scorching. Avoid using an open flame where possible, as uneven heat can cause bubbling or incomplete shrinkage.
Is this heat shrink tubing flame-retardant and suitable for outdoor use?
Polyolefin heat shrink tubing is generally flame-retardant and in most cases meets UL 224 or equivalent standards. It provides good resistance to moisture, UV exposure, and mild chemicals, making it suitable for many indoor and protected outdoor applications — including automotive engine bays and marine cable runs. For harsh or continuously submerged environments, confirm the specific variant's rating before use.
What wire gauges and connector types is this compatible with?
This tubing is compatible with standard copper and aluminum wire, butt connectors, ring terminals, solder joints, and cable bundles. The wide diameter range — Ø 1 mm to Ø 50 mm — covers applications from fine gauge signal wires (AWG 30 and smaller) up to large power cables and conduit bundles. It is not a substitute for adhesive-lined (3:1) tubing in applications requiring a waterproof seal.
How do I convert the diameter sizes to inches?
To convert mm to inches, divide by 25.4. Common conversions from this range:
- Ø 1 mm ≈ 3/64"
- Ø 3 mm ≈ 1/8"
- Ø 6 mm ≈ 15/64" (approx. 1/4")
- Ø 10 mm ≈ 3/8"
- Ø 25 mm ≈ 1"
- Ø 50 mm ≈ 2"
Select the diameter in the variant dropdown above to see all available sizes.
Can I use this tubing for automotive wiring repairs?
Yes. Heat shrink tubing is widely used in automotive wiring harness repair, connector insulation, and wire bundling. The color-coded options (Brown, Orange, Purple, Grey, Yellow-green) make it easy to maintain wire identification conventions in complex harnesses. Ensure the diameter you select fits snugly over the connector or splice before shrinking, and use a heat gun rather than a torch in tight engine bay spaces.
How much tubing do I need for my project?
For individual wire splices or connector insulation, typically 20–50 mm (approx. 1–2") per joint is sufficient. For longer cable runs or harness bundling, measure the total run length and add 10–15% for trimming and overlap. The 10 m length option is generally the most economical for larger jobs, while the 1 m or 2 m options suit small repairs or prototyping.
🛒 Select your color, diameter, and length above, then add to cart — ships from our US warehouse.
