Heat Shrink Tubing 2:1 — Reliable Electrical Sleeving for Wire Insulation & Cable Repair
Stripped wires, exposed splices, and loose connector ends are a safety hazard in any project — whether you're rewiring a car, building a DIY electronics kit, or tidying up a home electrical panel. This 2:1 heat shrink tubing gives hobbyists, auto technicians, and electricians a fast, clean way to insulate, protect, and identify wires without tape that unravels or adhesives that dry out.
Each listing covers a single size and color combination, available in lengths of 1 meter (≈39"), 2 meters (≈79"), or 5 meters (≈197"). Sizes range from 1mm (≈3/64") up to 50mm (≈2"), covering everything from fine gauge signal wires to large cable bundles. The tubing is made from flame-retardant polyolefin, which shrinks to approximately half its expanded diameter when heat is applied — no adhesive, no mess.
Typical use cases include automotive wiring harness repair, marine cable management, PCB lead insulation, and color-coded wire identification in control panels. With 11 sheath colors available — including the IEC-standard Yellow & Green for grounding conductors — this heat shrink electrical sleeving integrates naturally into professional and DIY wiring workflows alike.
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Compatibility: Fits standard round wire, stranded cable, and connector barrels. Verify the expanded inner diameter is at least 10–20% larger than your component's outer diameter before ordering. Shrink ratio is 2:1 — recovered diameter is approximately half the listed size.
✅ 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, splices, and connectors without gaps or bunching.
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🛡️Flame-Retardant Polyolefin — The material is self-extinguishing and resists moisture, mild chemicals, and abrasion, making it suitable for automotive, marine, and industrial wiring environments.
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📏Wide Size Range (1mm–50mm) — Covers fine signal wires up to large cable bundles, so you can stock one product line for an entire workshop rather than sourcing multiple SKUs.
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🎨11 Color Options — Includes Black, White, Red, Blue, Green, Yellow, Orange, Brown, Gray, Purple, and Yellow & Green (IEC grounding standard), enabling color-coded wire identification in control panels and harnesses.
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✂️Cut-to-Length Flexibility — Available in 1, 2, or 5-meter lengths so you can order exactly what your project requires, whether it's a single repair or a full wiring run.
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⚡Low Activation Temperature — Begins shrinking at approximately 70–90°C (158–194°F), compatible with standard heat guns, making installation straightforward for both bench work and in-situ cable repairs.
📐 Technical Specifications — Heat Shrink Tubing
| Product Type |
2:1 Heat Shrink Tubing (Polyolefin) |
| Shrink Ratio |
2:1 |
| Available Sizes (Expanded ID) |
1mm (≈3/64") · 2mm · 3mm · 4mm · 5mm · 6mm · 7mm · 8mm · 9mm · 10mm (≈3/8") · 12mm · 14mm · 15mm · 16mm · 18mm · 20mm (≈3/4") · 22mm · 25mm (≈1") · 28mm · 30mm · 35mm · 40mm · 45mm · 50mm (≈2") |
| Available Lengths |
1 Meter (≈39") · 2 Meter (≈79") · 5 Meter (≈197") |
| Available Colors |
Black, White, Red, Blue, Green, Yellow, Orange, Brown, Gray, Purple, Yellow & Green |
| Material |
Flame-retardant polyolefin |
| Activation Temperature |
Typically 70–90°C (158–194°F) |
| Full Recovery Temperature |
Typically ~120°C (248°F) |
| Operating Temperature Range |
See variant options / Contact us to confirm |
| Wall Thickness (recovered) |
See variant options |
| Voltage Rating |
Contact us to confirm |
| Standards Compliance |
Contact us to confirm |
| Application |
Wire insulation, cable bundling, connector protection, color coding |
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Note: This is standard 2:1 polyolefin tubing without an adhesive inner lining. For fully waterproof or strain-relief applications, consider adhesive-lined heat shrink (3:1 or 4:1 ratio). If you need specific voltage ratings or compliance certifications, please contact us before ordering.
❓ Frequently Asked Questions
How do I choose the right heat shrink tubing size?
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 that measurement. After shrinking at a 2:1 ratio, the tube will recover to roughly half its original diameter. For example, a 10mm (3/8") tube shrinks down to approximately 5mm (3/16"). When in doubt, size up — a slightly oversized tube will still shrink snugly, while an undersized tube won't fit over the component at all.
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. For example, a 20mm (≈3/4") tube will recover to roughly 10mm (≈3/8"). This ratio is the most common for general-purpose electrical insulation and wire bundling. If you need a tighter grip or waterproofing, look for 3:1 or 4:1 adhesive-lined tubing instead.
What temperature is needed to shrink this tubing?
This polyolefin heat shrink tubing typically activates at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinkage. A lighter or match can work in a pinch but may cause uneven shrinkage or scorching, especially on smaller diameters.
Is this heat shrink tubing suitable for outdoor or marine use?
Standard polyolefin 2:1 tubing generally provides good resistance to moisture, UV exposure, and mild chemicals, making it suitable for many outdoor and automotive applications. However, for fully waterproof or marine-grade connections — such as bilge wiring or underwater connectors — we recommend using adhesive-lined (3:1 or 4:1) heat shrink tubing instead. Contact us to confirm suitability for your specific environment.
What wire gauges and connector types is this compatible with?
This tubing is compatible with a wide range of wire gauges and connector types. As a general guide: the 1–3mm sizes typically suit AWG 20–28 signal wires; mid-range 4–10mm sizes cover AWG 10–18 power wires; larger 12–50mm sizes are suited for cable bundles, conduit ends, and larger connectors. Always verify the expanded inner diameter against your component's outer diameter before ordering.
Can I use this tubing for automotive wiring repairs?
Yes. This heat shrink tubing is commonly used for automotive wiring harness repair, connector insulation, and wire bundling. The flame-retardant polyolefin material generally withstands the temperature ranges found in engine bays and under-dash environments. For high-heat zones near exhaust components, a higher-temperature rated tubing may be more appropriate — contact us to confirm.
How much tubing do I need — should I order 1, 2, or 5 meters?
For a single repair or small connection, 1 meter (≈39") is typically sufficient. For wiring a full automotive harness, control panel, or multi-connection project, 2–5 meters is a practical choice. The 5-meter option offers the best value per meter for workshop stock or recurring use across multiple projects.
🛒 Select your size, color, and length above, then add to cart — ships from our US warehouse.
