Heat Shrink Tubing 2:1 — Reliable Electrical Insulation for Every Wire Size
Loose wire connections, exposed terminals, and unprotected cable splices are a constant headache for electricians, automotive technicians, and DIY enthusiasts alike. Whether you're rewiring a vehicle harness, protecting a marine connector, or tidying up a home electrical project, having the right heat shrink tubing on hand makes the difference between a clean, lasting repair and one that fails under stress.
This heat shrink tubing features a 2:1 shrink ratio and is available in diameters from 16mm (≈5/8") to 50mm (≈2"), in lengths of 1 Meter (≈39"), 2 Meter (≈79"), and 5 Meter (≈197"). Seven color options — Black, White, Red, Green, Yellow, Blue, and Clear — allow for easy color-coding of circuits and cable identification. The tubing is made from polyolefin, a material known for its flexibility, chemical resistance, and consistent shrink performance.
Typical applications include automotive wire harness repair, marine and RV electrical connections, home appliance wiring, workshop cable management, and color-coded circuit identification in control panels. The wide diameter range makes this heat shrink tubing for electrical wiring suitable for everything from small terminal connectors to large cable bundles.
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Compatibility: Suitable for copper wire, aluminum wire, cable bundles, terminals, and connectors. Fits standard wire gauges across the 16–50mm outer diameter range. Verify your pre-shrink diameter before ordering — see FAQ below for sizing guidance.
✅ Key Features of These Heat Shrink Tubes
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🔥2:1 Shrink Ratio — Shrinks to approximately half its original diameter when heat is applied, creating a snug, uniform fit around wires, connectors, and cable splices.
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📏Wide Diameter Range — Available from 16mm (≈5/8") to 50mm (≈2"), covering small terminal pins up to large cable loom assemblies in a single product line.
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🎨7 Color Options — Black, White, Red, Green, Yellow, Blue, and Clear enable color-coded wire identification, a standard practice in automotive, marine, and industrial electrical wiring.
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🧪Polyolefin Construction — Polyolefin heat shrink tubing resists moisture, mild chemicals, and abrasion, making it suitable for both indoor wiring projects and sheltered outdoor cable protection.
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✂️Cut-to-Length Flexibility — Available in 1m, 2m, and 5m lengths so you can cut exactly what you need for each connection, reducing waste on large wiring jobs.
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⚡Electrical Insulation — Provides a protective insulating layer over exposed conductors, solder joints, and wire splices, helping prevent short circuits and accidental contact.
📐 Technical Specifications — Heat Shrink Tubing
| Product Type |
Heat Shrink Tubing / Electrical Sleeving |
| Shrink Ratio |
2:1 |
| Available Diameters |
16mm (≈5/8"), 18mm (≈11/16"), 20mm (≈3/4"), 22mm (≈7/8"), 25mm (≈1"), 28mm (≈1-1/8"), 30mm (≈1-3/16"), 35mm (≈1-3/8"), 40mm (≈1-9/16"), 45mm (≈1-3/4"), 50mm (≈2") |
| Available Lengths |
1 Meter (≈39"), 2 Meter (≈79"), 5 Meter (≈197") |
| Available Colors |
Black, White, Red, Green, Yellow, Blue, Clear |
| Material |
Polyolefin |
| Shrink Temperature |
Typically 90–120°C (194–248°F) |
| Voltage Rating |
See variant options / Contact us to confirm |
| Application Method |
Heat gun recommended; avoid open flame |
| Typical Use |
Wire insulation, cable bundling, connector protection, color-coding |
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Sizing Note: Always measure the outer diameter of your wire or connector before selecting a size. The tubing must slide over the object before shrinking. When in doubt, size up — you can always apply more heat, but you cannot reverse an over-shrunk tube.
❓ Frequently Asked Questions
How do I choose the right diameter of heat shrink tubing?
Measure the outer diameter of the wire or connector before shrinking. Choose a tubing diameter that is 20–30% larger than the object so it slides on easily. After heat is applied, the tubing shrinks to roughly half its original diameter (2:1 ratio), forming a tight seal. For example, 20mm (≈3/4") tubing shrinks to approximately 10mm (≈3/8").
What does 2:1 shrink ratio mean?
A 2:1 shrink ratio means the tubing will shrink to approximately half its supplied diameter when heat is applied. For example, 40mm (≈1-9/16") tubing will shrink down to roughly 20mm (≈3/4"). This ratio is the most common for general-purpose electrical insulation and cable protection.
What temperature is needed to shrink this tubing?
This tubing generally requires a temperature of around 90–120°C (194–248°F) to begin shrinking. A heat gun is the recommended tool for even, controlled shrinkage. Avoid open flames, which can cause uneven shrinkage, scorching, or damage to the underlying wire insulation.
Can this heat shrink tubing be used outdoors?
This tubing is generally suitable for indoor and sheltered outdoor use. Polyolefin offers good moisture resistance for typical outdoor environments. For prolonged UV exposure or submersion, please contact us to confirm the specific rating for your chosen variant before ordering.
What voltage rating does this tubing support?
Standard polyolefin heat shrink tubing in this size range typically supports up to 600V. For high-voltage, industrial, or safety-critical applications, please contact us to confirm the specific dielectric rating for your chosen diameter and color variant.
Is this tubing compatible with standard wire gauges?
Yes. The 16–50mm diameter range covers a wide variety of wire bundles, cable looms, connectors, and terminals. The 16mm (≈5/8") size is generally suited for smaller wire bundles and individual conductors, while 40–50mm (≈1-9/16" to 2") sizes are typically used for larger cable assemblies, conduit ends, or pipe insulation in low-voltage applications.
Which color should I choose for my application?
Color-coding is a standard practice in electrical work. Black is the most universal choice for general insulation. Red, blue, green, yellow, and white are commonly used to identify specific circuits, phases, or wire functions. Clear tubing allows the underlying wire color, label, or printed marking to remain visible after installation — useful for traceability in control panels and automotive wiring.
🛒 Select your diameter, color, and length above, then add to cart — ships from our US warehouse.
