40mm Heat Shrink Tubing 2:1 Ratio — Flexible Wire Sleeve for Electrical & Automotive Cable Wrap

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40mm Heat Shrink Tubing 2:1 Ratio — Flexible Wire Sleeve for Electrical & Automotive Cable Wrap

HomeDIYer

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By HomeDIYer®

Colour: Black

Inner Diameter(mm): φ40mm

Hose Length (m）: 1 Metre

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$4.07 USD

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In stock (500 units), ready to be shipped

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40mm Heat Shrink Tubing — Reliable Insulation for Electrical & Automotive Cable Wrap

Loose wire ends, exposed splices, and tangled cable bundles are a frustration for every DIYer, auto technician, and electrician. Whether you're rewiring a trailer, tidying up a home workshop, or protecting a marine electrical connection, having the right 40mm heat shrink tubing on hand makes the job cleaner, safer, and longer-lasting.

Each roll contains a continuous length of 2:1 ratio polyolefin heat shrink tubing with an inner diameter of 40mm (≈1.57"). Available in lengths of 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft), and in 7 colors — Black, White, Red, Green, Yellow, Blue, and Transparent — so you can color-code circuits or match your project's requirements. The tubing shrinks to approximately 20mm upon heat application, conforming snugly around cables, connectors, and splices.

Typical use cases include automotive wiring harness protection, bundling multi-conductor cables in control panels, insulating large-gauge wire splices in RV and trailer builds, and protecting conduit ends in outdoor electrical installations — all scenarios where a durable, flexible cable wire wrap is essential.

ℹ️ Compatibility Note: This tubing fits cables and bundles with an outer diameter up to approximately 38mm before shrinking. Confirm your cable bundle's outer diameter before ordering. For smaller wire gauges, see our other heat shrink tubing sizes.

✅ Key Features of These 40mm Heat Shrink Tubing Sleeves

🔥2:1 Shrink Ratio — Shrinks from 40mm down to approximately 20mm inner diameter, creating a firm, uniform fit around cables, connectors, and wire splices without gaps or loose ends.
🎨7 Color Options — Black, White, Red, Green, Yellow, Blue, and Transparent allow easy color-coding of electrical circuits, phase identification, and visual organization in automotive or DIY wiring projects.
📏Four Length Options — Choose from 1m, 2m, 5m, or 10m rolls to match your project scale, from a single connector repair to a full wiring harness installation.
🛡️Polyolefin Construction — Flexible, moisture-resistant polyolefin material provides electrical insulation and mechanical protection for automotive cable wrap, outdoor wiring, and marine electrical connections.
✂️Easy to Cut and Apply — Cuts cleanly with standard scissors or a utility knife; shrinks evenly with a heat gun, making it straightforward to use for both first-time DIYers and experienced technicians.
🌡️Low Activation Temperature — Typically begins shrinking at around 70–90°C (158–194°F), compatible with standard heat guns — no specialized equipment required for most electrical insulation sleeve applications.

📐 Technical Specifications — 40mm Heat Shrink Tubing

Product Type	Heat Shrink Tubing / Electrical Insulation Sleeve
Inner Diameter (Before Shrink)	40mm (≈1.57")
Inner Diameter (After Shrink)	Approximately 20mm (≈0.79")
Shrink Ratio	2:1
Material	Polyolefin
Available Colors	Black, White, Red, Green, Yellow, Blue, Transparent
Available Lengths	1m (≈3.3 ft) / 2m (≈6.6 ft) / 5m (≈16.4 ft) / 10m (≈32.8 ft)
Shrink Temperature	Typically 70–90°C (158–194°F) activation; full recovery at approx. 120°C (248°F)
Wall Thickness (After Shrink)	See variant options
Operating Temperature Range	Contact us to confirm
Compliance	Contact us to confirm (RoHS / Halogen-free)
Application	Automotive wiring, electrical insulation, cable bundling, DIY wire wrap

⚠️ Sizing Tip: Always measure the outer diameter of your cable bundle before selecting tubing. The cable bundle should be no larger than approximately 38mm OD to fit inside this 40mm tubing before shrinking.

❓ Frequently Asked Questions

How do I choose the right length of heat shrink tubing?

Measure the total cable run you need to cover and add 10–15% extra for overlap and trimming. For a single connector joint, 1 metre is typically sufficient. For wiring harnesses or longer runs, 5 or 10 metre rolls are generally more economical. Available lengths: 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft).

What does 2:1 shrink ratio mean?

A 2:1 shrink ratio means the tubing shrinks to half its original inner diameter when heat is applied. This 40mm tubing will shrink down to approximately 20mm, conforming snugly around cables, connectors, or splices in that size range.

What is the minimum shrink temperature, and can I use a heat gun?

Polyolefin heat shrink tubing of this type typically begins shrinking at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A standard heat gun set to low or medium is generally sufficient — avoid open flames, which can cause uneven shrinkage or scorching.

Can this heat shrink tubing be used outdoors or in automotive applications?

Yes. Polyolefin heat shrink tubing is generally resistant to moisture, UV exposure, and common automotive fluids, making it suitable for outdoor wiring, engine bay cable management, trailer wiring, and marine electrical connections. For prolonged submersion, an adhesive-lined variant is typically recommended.

What cable or wire diameter fits inside 40mm heat shrink tubing?

The inner diameter before shrinking is 40mm (≈1.57"). It is designed to fit over cables, conduit bundles, or connectors with an outer diameter up to approximately 38mm. After shrinking, it recovers to roughly 20mm. Always measure your cable bundle's outer diameter before selecting a size.

Does the color affect performance or insulation strength?

No — all color variants (Black, White, Red, Green, Yellow, Blue, Transparent) share the same polyolefin material and 2:1 shrink ratio. Color selection is typically used for color-coding wiring circuits, phase identification in electrical panels, or simply for visual organization in DIY projects.

Is this tubing RoHS compliant and halogen-free?

Polyolefin heat shrink tubing in this category is generally manufactured to be RoHS compliant and halogen-free. If compliance documentation is required for a specific project or industry application, please contact us to confirm before ordering.

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

40mm Heat Shrink Tubing 2:1 Ratio — Flexible Wire Sleeve for Electrical & Automotive Cable Wrap

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Description

40mm Heat Shrink Tubing — Reliable Insulation for Electrical & Automotive Cable Wrap

✅ Key Features of These 40mm Heat Shrink Tubing Sleeves

📐 Technical Specifications — 40mm Heat Shrink Tubing

❓ Frequently Asked Questions

40mm Heat Shrink Tubing 2:1 Ratio — Flexible Wire Sleeve for Electrical & Automotive Cable Wrap

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