30mm Heat Shrink Tubing 2:1 Ratio – Flexible Wire Sleeve for Automotive & Electrical Use

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30mm Heat Shrink Tubing 2:1 Ratio – Flexible Wire Sleeve for Automotive & Electrical Use

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By HomeDIYer®

Colour: Black

Inner Diameter(mm): φ30mm

Hose Length (m）: 1 Metre

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$2.16 USD

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In stock (500 units), ready to be shipped

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30mm Heat Shrink Tubing 2:1 — Reliable Insulation for Automotive Wiring & DIY Electrical Projects

Dealing with exposed wire splices, fraying cable ends, or a tangled wiring harness that needs clean, professional insulation? Whether you're a home DIYer tackling an automotive repair or an electrician managing a complex cable run, finding heat shrink tubing that fits large-diameter wires without splitting or sliding off is a constant frustration. Loose insulation leads to shorts, corrosion, and safety hazards — especially in vehicles and outdoor installations.

This 30mm heat shrink tubing features a 2:1 shrink ratio, meaning it shrinks from a 30mm (≈1.18") inner diameter down to approximately 15mm (≈0.59") when heat is applied. Each listing covers a single continuous length — available in 1 metre (≈3.3 ft), 2 metres (≈6.6 ft), 5 metres (≈16.4 ft), and 10 metres (≈32.8 ft) — so you can buy exactly what your project requires. Made from flexible polyolefin material, it delivers consistent wall coverage and a firm, moisture-resistant seal after shrinking. Choose from 7 colors: Black, White, Red, Green, Yellow, Blue, and Transparent.

This tubing is a go-to solution for automotive wiring harness repair, battery cable insulation, marine electrical connections, and color-coded wire management in control panels. Its flexibility and color variety make it equally useful for heat shrink tubing for car wiring, DIY home electrical projects, and workshop cable organization.

ℹ️ Compatibility: Fits cable bundles and connectors typically in the 15–28mm diameter range. Verify your cable outer diameter before ordering. Inner diameter before shrinking: φ30mm. Shrinks to approximately φ15mm.

✅ Key Features of These 30mm Heat Shrink Tubing Sleeves

🔥2:1 Shrink Ratio — Shrinks from 30mm (≈1.18") to approximately 15mm (≈0.59"), creating a tight, conforming seal around cables, splices, and connectors without gaps or lifting edges.
🎨7 Color Options — Available in Black, White, Red, Green, Yellow, Blue, and Transparent for easy color-coding of wiring harnesses, circuit panels, and DIY electrical projects.
🛡️Moisture & Abrasion Resistance — Polyolefin construction generally provides resistance to moisture ingress, mild chemicals, and physical abrasion — suitable for automotive underhood and outdoor cable protection applications.
⚡Electrical Insulation — Designed to provide reliable dielectric insulation for wire splices, terminal connections, and exposed conductors in low-to-medium voltage electrical systems.
✂️Cut-to-Length Flexibility — Supplied in continuous rolls of 1m, 2m, 5m, or 10m so you can cut exactly the piece size you need, minimizing waste on large wiring harness repair jobs.
🚗Automotive & DIY Ready — Sized for larger cable bundles common in automotive battery cables, marine wiring, and workshop power tool cord repair — where standard small-diameter heat shrink tubing simply won't fit.

📐 Technical Specifications — 30mm Heat Shrink Tubing

Product Type	Heat Shrink Tubing
Inner Diameter (Before Shrink)	φ30mm (≈1.18")
Inner Diameter (After Shrink)	Approximately φ15mm (≈0.59")
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)
Voltage Rating	Typically up to 600V — Contact us to confirm
Operating Temperature	Typically -55°C to +125°C (-67°F to +257°F) — Contact us to confirm
Shrink Temperature	Typically activates at approximately 90°C (194°F)
Wall Thickness (After Shrink)	See variant options
Application Method	Heat gun recommended; lighter suitable for small sections
Suitable For	Automotive wiring, battery cables, marine electrical, DIY electrical projects

⚠️ Sizing Note: Always measure your cable or connector outer diameter before selecting a size. The tubing must slide over the cable before shrinking. If your cable OD is close to 30mm, consider the next size up for easier installation.

❓ Frequently Asked Questions

What length of heat shrink tubing do I need?

Measure the total length of the cable run or splice you need to cover, then add at least 10–15% extra for overlap and trimming. For a single wire splice, 1 metre is generally sufficient. For wiring harnesses or longer runs, 5 or 10 metre rolls are more economical. As a rule of thumb, cut pieces about 20% longer than the area you need to cover before shrinking.

What does 2:1 shrink ratio mean?

A 2:1 shrink ratio means the tubing will shrink to approximately half its original inner diameter when heat is applied. This 30mm tubing will typically shrink down to around 15mm (≈0.59"), providing a snug, secure fit over cables, connectors, and splices in that size range.

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

Yes. Polyolefin heat shrink tubing is generally rated for outdoor and automotive use. It typically provides resistance to UV exposure, moisture, and common automotive fluids. For harsh or submerged environments, we recommend confirming the specific rating with us before purchase.

What is the voltage and temperature rating of this tubing?

Polyolefin 2:1 heat shrink tubing of this type is generally rated for up to 600V and an operating temperature range of approximately -55°C to +125°C (-67°F to +257°F). Contact us to confirm the exact specifications for your application.

What tool do I use to shrink this tubing?

A heat gun is the recommended tool for even, controlled shrinking. In a pinch, a lighter or match can work for small sections, but a heat gun gives the most consistent results and reduces the risk of scorching. Avoid direct flame contact with the tubing surface.

Is this tubing compatible with standard wire gauges and connectors?

With a 30mm inner diameter before shrinking, this tubing is well-suited for larger cable bundles, thick automotive wiring, battery cables, and connectors in the 15–28mm diameter range. It is compatible with standard metric and AWG wire bundles in that size range. See variant options for exact sizing.

Can I use this for color-coding wires in my project?

Absolutely. This tubing is available in 7 colors — Black, White, Red, Green, Yellow, Blue, and Transparent — making it ideal for color-coding wiring harnesses, circuit boards, and DIY electrical projects for quick visual identification.

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

30mm Heat Shrink Tubing 2:1 Ratio – Flexible Wire Sleeve for Automotive & Electrical Use

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Description

30mm Heat Shrink Tubing 2:1 — Reliable Insulation for Automotive Wiring & DIY Electrical Projects

✅ Key Features of These 30mm Heat Shrink Tubing Sleeves

📐 Technical Specifications — 30mm Heat Shrink Tubing

❓ Frequently Asked Questions

30mm Heat Shrink Tubing 2:1 Ratio – Flexible Wire Sleeve for Automotive & Electrical Use

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