2:1 Heat Shrink Tubing — Reliable Insulation & Cable Protection from 5.5mm to 35mm
Loose wire ends, exposed splices, and unprotected connectors are a constant headache for electricians, automotive technicians, and serious DIYers. One nick in the insulation can mean a short circuit, a failed inspection, or worse. This 2:1 heat shrink tubing gives you a clean, professional-grade solution that seals and protects in seconds — no tape, no mess, no guesswork.
Each listing covers a single length of tubing — available in 1 Meter (≈39.4") or 5 Meter (≈196.9") — made from flexible polyolefin material. Sizes range from 5.5mm (≈7/32") up to 35mm (≈1-3/8") expanded inner diameter, shrinking to approximately half that diameter at a 2:1 ratio. Seven color options — Black, White, Red, Green, Yellow, Blue, and Transparent — make color-coding wiring runs straightforward.
Typical use cases include automotive wiring harness repair, marine cable bundling, home electrical panel work, RC hobby builds, and workshop tool cord management. The flexible wall conforms tightly around irregular shapes, making it a go-to for heat shrink wire connectors, terminal insulation, and multi-conductor cable sleeving.
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Compatibility Note: This tubing fits standard round wire, multi-conductor cables, and most crimp connectors. Verify the expanded inner diameter is at least 10–20% larger than your cable's outer diameter before ordering. Sizes listed are before shrinking.
✅ Key Features of These 2:1 Heat Shrink Tubing Sleeves
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🔥True 2:1 Shrink Ratio — Recovers to approximately half its expanded diameter, creating a snug, uniform fit around wires, terminals, and connectors without gaps or bunching.
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📏Wide Size Range (5.5mm–35mm) — Covers everything from thin signal wires to large-gauge power cables, reducing the need to stock multiple product lines for a single job.
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🎨7 Color Options for Easy Wire Identification — Black, White, Red, Green, Yellow, Blue, and Transparent allow color-coded wiring systems that simplify troubleshooting and meet common wiring standards.
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⚡Polyolefin Construction — Offers solid electrical insulation, flexibility at low temperatures, and general resistance to oils and common solvents — suitable for automotive, marine, and industrial heat shrink applications.
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✂️Cut-to-Length Convenience — Available in 1-meter and 5-meter lengths so you can cut exactly what you need, minimizing waste on small repairs or stocking up for larger cable sleeving projects.
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🌡️Low Activation Temperature — Begins shrinking at approximately 90°C (194°F), compatible with standard heat guns and even careful use of a lighter for field repairs where a heat gun isn't available.
📐 Technical Specifications — 2:1 Heat Shrink Tubing
| Product Type |
2:1 Heat Shrink Tubing / Cable Sleeving |
| Material |
Polyolefin (flexible, halogen-free construction typical for this type) |
| Shrink Ratio |
2:1 |
| Expanded Inner Diameter |
5.5mm (≈7/32") — 35mm (≈1-3/8") |
| Recovered Inner Diameter |
Approximately half the expanded diameter (e.g., 10mm → ≈5mm) |
| Available Sizes |
5.5 / 6 / 6.5 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 18 / 20 / 22 / 25 / 28 / 30 / 35 mm |
| Available Colors |
Black, White, Red, Green, Yellow, Blue, Transparent |
| Available Lengths |
1 Meter (≈39.4") / 5 Meter (≈196.9") |
| Shrink Temperature |
Typically begins at ≈90°C (194°F); full recovery at ≈120°C (248°F) |
| Operating Temperature |
See variant options / Contact us to confirm |
| Wall Thickness (recovered) |
See variant options |
| Voltage Rating |
Contact us to confirm |
| Compliance / Standards |
Contact us to confirm |
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Spec Confirmation: Wall thickness, voltage rating, and compliance certifications vary by size. If your application requires specific electrical ratings or certifications, please contact us before ordering.
❓ Frequently Asked Questions
How do I choose the right size heat shrink tubing?
Measure the outer diameter of the wire or connector before shrinking. Choose a tube whose expanded inner diameter is at least 10–20% larger than the object. After shrinking at a 2:1 ratio, the tube will recover to roughly half its expanded diameter. For example, a 10mm tube shrinks to approximately 5mm (≈3/16"). When in doubt, size up — a slightly loose fit before shrinking is better than a tube that won't slide over the connector.
What shrink ratio does this tubing use?
This tubing uses a 2:1 shrink ratio, meaning it will shrink to approximately half its original expanded diameter when heat is applied. This is the most common ratio for general-purpose electrical insulation, wire bundling, and DIY cable sleeving projects.
What temperature is needed to shrink this tubing?
Generally, polyolefin heat shrink tubing begins to shrink at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinkage. Avoid open flames where possible, as they can cause uneven shrinkage or scorching of the tubing surface.
Can this heat shrink tubing be used outdoors or in wet environments?
Standard polyolefin heat shrink tubing provides basic moisture resistance and is suitable for many outdoor applications such as garden lighting wiring or automotive underhood use. However, for prolonged UV exposure, submersion, or marine environments, a dual-wall adhesive-lined heat shrink tube is typically recommended for a fully waterproof seal. Contact us to confirm suitability for your specific environment.
Is this tubing compatible with automotive wiring and connectors?
Yes. Polyolefin heat shrink tubing is widely used in automotive wiring harness repair, connector insulation, and cable bundling. It is generally resistant to oils, fuels, and common automotive fluids. Confirm the operating temperature range matches your application — engine bay environments can reach higher sustained temperatures than typical household wiring.
How do I convert the mm sizes to inches?
Divide the mm value by 25.4 to get inches. Quick reference for this product's size range:
- 5.5mm ≈ 0.22" (7/32")
- 6mm ≈ 0.24" (1/4")
- 10mm ≈ 0.39" (3/8")
- 16mm ≈ 0.63" (5/8")
- 20mm ≈ 0.79" (25/32")
- 25mm ≈ 0.98" (1")
- 35mm ≈ 1.38" (1-3/8")
All sizes listed are expanded (before shrinking) inner diameters.
What is the difference between the 1-meter and 5-meter length options?
Both options are the same tubing material and quality. The 5-meter length is ideal for larger wiring projects, production runs, or when you need consistent coverage across multiple cables without joining pieces. The 1-meter option suits quick repairs, single-connector jobs, or when you want to test a size before committing to a longer roll.
Can I use a lighter instead of a heat gun to shrink this tubing?
In field situations where a heat gun is unavailable, a lighter can be used carefully — keep the flame moving and maintain distance to avoid scorching. For best results and a clean finish, a heat gun with a focused nozzle is strongly recommended, especially for larger diameters (16mm and above) where even heat distribution matters most.
🛒 Select your size, color, and length above, then add to cart — ships from our US warehouse.
