How do I convert the diameter sizes to inches?

Here are approximate conversions: Φ1.6mm ≈ 1/16" | Φ2.4mm ≈ 3/32" | Φ3.2mm ≈ 1/8" | Φ4.8mm ≈ 3/16" | Φ6.4mm ≈ 1/4" | Φ9.5mm ≈ 3/8" | Φ12.7mm = 1/2" | Φ19.1mm = 3/4" | Φ25.4mm = 1".

3:1 Heat Shrink Tubing — Dual Wall Adhesive-Free Sleeve, Φ1.6mm to Φ65mm, 8 Colors

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3:1 Heat Shrink Tubing — Dual Wall Adhesive-Free Sleeve, Φ1.6mm to Φ65mm, 8 Colors

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By HomeDIYer®

Diameter(unshrunk): Φ1.6mm

Colours: Schwarz

Menge (Meter): 1

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$3.14 USD

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In stock (500 units), ready to be shipped

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3:1 Heat Shrink Tubing — Reliable Wire Insulation from Φ1.6mm to Φ65mm

Whether you're repairing a frayed automotive harness, bundling control panel wiring, or protecting marine cable connections, loose or exposed wires create real safety risks. DIYers, electricians, and hobbyists alike need a heat shrink solution that grips tightly, covers a wide range of wire gauges, and holds up over time — without requiring multiple product SKUs for different jobs.

This 3:1 heat shrink tubing is available in 15 unshrunk diameters ranging from Φ1.6mm (≈1/16") to Φ65mm (≈2-9/16"), in 8 colors (Black, Red, White, Transparent, Yellow, Blue, Green, Orange), and in lengths of 1m, 2m, 3m, or 5m per piece. Made from flexible polyolefin, it shrinks to approximately one-third of its original inner diameter when heat is applied — providing a snug, uniform fit over connectors, terminals, splices, and bundled cables.

Typical use cases include automotive wiring harness repair and connector insulation, electrical panel cable management and color-coding, RC hobby and electronics prototyping, and outdoor or marine wire protection where moisture resistance matters.

ℹ️ Compatibility Note: This tubing fits standard wire gauges from AWG 30 down to large cable bundles. Select the unshrunk diameter that is at least 10–20% larger than your component's outer diameter. After shrinking, the inner diameter reduces to approximately 1/3 of the listed size.

⚠️ Size Tip: Diameter values shown are before shrinking. If you are unsure of your wire diameter, size up — it is easier to use a slightly larger tube than one that is too small to slide over your connector.

✅ Key Features of These 3:1 Heat Shrink Tubes

🔥3:1 Shrink Ratio — Shrinks to roughly one-third of its original diameter, making it ideal for irregular connectors, stepped cables, and bundled wire groups where standard 2:1 tubing leaves gaps.
📐15 Diameter Options — Covers Φ1.6mm through Φ65mm (≈1/16" to ≈2-9/16"), so you can insulate everything from fine signal wires to large power cables with a single product line.
🎨8 Color Choices — Black, Red, White, Transparent, Yellow, Blue, Green, and Orange allow color-coded wiring for easy circuit identification and professional-looking cable management.
🛡️Polyolefin Construction — Offers solid electrical insulation, resistance to moisture and mild chemicals, and flexibility after shrinking — suitable for automotive, marine, and indoor electrical applications.
✂️Cut-to-Length Flexibility — Available in 1m, 2m, 3m, and 5m lengths per piece, so you can cut exactly what you need for each repair or installation without waste.
⚡Fast Heat Activation — Responds quickly to a standard heat gun at around 90–120°C (194–248°F), allowing efficient installation even in tight spaces or during field repairs.

📐 Technical Specifications — 3:1 Heat Shrink Tubing

Product Type	Heat Shrink Tubing
Shrink Ratio	3:1
Material	Polyolefin (adhesive-free, single wall)
Unshrunk Diameter Range	Φ1.6mm (≈1/16") — Φ65mm (≈2-9/16")
Available Diameters	Φ1.6 / 2.4 / 3.2 / 4.8 / 6.4 / 7.9 / 9.5 / 12.7 / 15.4 / 19.1 / 25.4 / 30 / 39 / 50 / 65mm
Available Colors	Black, Red, White, Transparent, Yellow, Blue, Green, Orange
Available Lengths	1m, 2m, 3m, 5m per piece
Activation Temperature	Typically 90–120°C (194–248°F)
Wall Thickness (after shrink)	See variant options
Voltage Rating	Contact us to confirm
Operating Temperature Range	Contact us to confirm
Adhesive Lining	None (single-wall, non-adhesive)
Suitable Applications	Automotive wiring, electronics, marine, DIY electrical repair

❓ Frequently Asked Questions

How do I choose the right diameter for my wires?

Measure the outer diameter of the wire or connector before shrinking. Choose a tubing size whose unshrunk inner diameter is at least 10–20% larger than your component. After heat is applied, the tubing shrinks to approximately 1/3 of its original diameter — so a Φ6.4mm (1/4") tube will shrink to roughly Φ2.1mm. When in doubt, size up.

What shrink ratio does this tubing use, and why does it matter?

This tubing uses a 3:1 shrink ratio, meaning it shrinks to approximately one-third of its original inner diameter when heat is applied. This is more versatile than standard 2:1 tubing — it can conform tightly to irregular shapes, stepped connectors, and bundled cables that 2:1 tubing may not seal properly.

What temperature do I need to shrink this tubing?

Generally, a heat gun set to around 90–120°C (194–248°F) is sufficient to activate shrinkage. Avoid open flames, which can cause uneven shrinking or scorching. Move the heat gun slowly and evenly along the tubing for the best result.

Can this heat shrink tubing be used outdoors or in marine environments?

Polyolefin heat shrink tubing generally offers good resistance to moisture, UV exposure, and mild chemicals, making it suitable for outdoor and marine cable protection in most cases. For submersion or extreme environments, we recommend contacting us to confirm suitability for your specific application.

Is this tubing compatible with automotive wiring harnesses?

Yes. Polyolefin heat shrink tubing is widely used in automotive wiring harness repair, connector insulation, and cable management. The 3:1 ratio provides a tighter fit over connectors and terminals compared to standard 2:1 tubing, making it a popular choice for automotive DIY and professional repair work.

Does this tubing have an adhesive lining for waterproofing?

No — this is a single-wall, adhesive-free heat shrink tubing. It provides electrical insulation and mechanical protection but does not create a fully waterproof seal on its own. If you need waterproofing, look for dual-wall adhesive-lined heat shrink tubing instead.

How do the diameter sizes convert to inches?

Here are the approximate inch equivalents for each unshrunk diameter:

Φ1.6mm ≈ 1/16"
Φ2.4mm ≈ 3/32"
Φ3.2mm ≈ 1/8"
Φ4.8mm ≈ 3/16"
Φ6.4mm ≈ 1/4"
Φ7.9mm ≈ 5/16"
Φ9.5mm ≈ 3/8"
Φ12.7mm = 1/2"
Φ15.4mm ≈ 5/8"
Φ19.1mm = 3/4"
Φ25.4mm = 1"
Φ30mm ≈ 1-3/16"
Φ39mm ≈ 1-9/16"
Φ50mm ≈ 2"
Φ65mm ≈ 2-9/16"

🛒 Select your diameter, color, and length above, then add to cart — ships from our US warehouse.

3:1 Heat Shrink Tubing — Dual Wall Adhesive-Free Sleeve, Φ1.6mm to Φ65mm, 8 Colors

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3:1 Heat Shrink Tubing — Reliable Wire Insulation from Φ1.6mm to Φ65mm

✅ Key Features of These 3:1 Heat Shrink Tubes

📐 Technical Specifications — 3:1 Heat Shrink Tubing

❓ Frequently Asked Questions

3:1 Heat Shrink Tubing — Dual Wall Adhesive-Free Sleeve, Φ1.6mm to Φ65mm, 8 Colors

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