What does 2:1 shrink ratio mean?

A 2:1 shrink ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. A Φ20mm tube, for example, will shrink down to roughly Φ10mm (≈3/8"), conforming tightly around the wire or component for a secure, insulated finish.

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

Yes. Polyolefin heat shrink tubing is generally suitable for automotive wire harness protection, marine electrical connections, and outdoor installations. It resists moisture, UV exposure, and vibration in most standard applications. For harsh chemical environments or continuous submersion, contact us to confirm suitability.

What temperature is needed to shrink this tubing?

This tubing typically begins shrinking at around 90–120°C (194–248°F). A heat gun is the recommended tool for even, controlled shrinkage across all diameters. For larger diameters (Φ50mm and above), a heat gun with a wide nozzle or reflector attachment is recommended for uniform coverage.

What wire gauge or cable size does each diameter fit?

The pre-shrink inner diameter is the listed size (e.g., Φ6mm fits cables up to approximately 6mm OD). After shrinking, the inner diameter reduces to approximately half. Small sizes like Φ0.6mm–Φ2mm are typically used for fine wires (28–22 AWG), mid-sizes like Φ3mm–Φ10mm for standard automotive and electronics wiring, and larger sizes like Φ25mm–Φ210mm for cable bundles, conduit ends, and industrial applications.

Black Heat Shrink Tubing 2:1 – Φ0.6mm to Φ210mm Wire Sleeving

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Black Heat Shrink Tubing 2:1 – Φ0.6mm to Φ210mm Wire Sleeving

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Diameter(unshrunk): Φ1mm

Length: 1M

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$1.35 USD

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In stock (500 units), ready to be shipped

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Black Heat Shrink Tubing 2:1 — One Listing, Every Size from Φ0.6mm to Φ210mm

Finding the right black heat shrink tubing for every job — from a delicate 28 AWG wire repair to a thick cable bundle on a marine vessel — usually means ordering from multiple suppliers. This listing solves that problem. Available in 43 diameters from Φ0.6mm (≈0.024\") all the way up to Φ210mm (≈8.3\"), this black 2:1 heat shrink tubing covers the full range that automotive technicians, marine electricians, industrial maintenance crews, and DIY builders actually need.

Each roll is made from polyolefin with a 2:1 shrink ratio — meaning the pre-shrink inner diameter reduces to approximately half after heat is applied. Available in 1 meter (≈39\"), 3 meter (≈118\"), 5 meter (≈197\"), 10 meter (≈394\"), and 25 meter (≈984\") lengths, so you can order exactly what a single repair needs or stock up for ongoing projects. Black finish provides a clean, professional look on finished wiring.

Typical applications include automotive wire harness protection and repair, marine electrical connection sealing, industrial cable bundle management, RC hobby and electronics builds, and home appliance wiring repairs where a clean black insulation sleeve is required.

🔌 Size Range: Φ0.6mm to Φ210mm pre-shrink inner diameter — 43 sizes available. Select your diameter above. After shrinking, each tube reduces to approximately half its listed diameter. Measure your wire or cable OD before ordering.

⚠️ Sizing tip: Choose a pre-shrink diameter slightly larger than your cable’s outer diameter so the tube slides on easily before heat is applied. If you’re unsure, contact us to confirm the right size for your application.

✅ Key Features of These Black Heat Shrink Tubes

📏43 Diameters in One Listing — From Φ0.6mm (≈0.024\") for fine wire insulation up to Φ210mm (≈8.3\") for large cable bundle management — no need to source from multiple suppliers for different jobs.
🔥2:1 Shrink Ratio — Shrinks to approximately half its original inner diameter when heat is applied, conforming tightly around wire splices, connectors, and cable ends for a secure, gap-free insulation layer.
🛡️Polyolefin Construction — Resists moisture, abrasion, and mild chemical exposure, making this black heat shrink sleeving suitable for automotive wire harness repair and marine electrical connections.
✂️Cut-to-Length Rolls — Available in 1m, 3m, 5m, 10m, and 25m rolls so you can cut exactly what each connection needs. The 25m roll is ideal for workshop stock and large cable bundle projects.
🌡️Low Activation Temperature — Begins shrinking at approximately 90–120°C (194–248°F), compatible with standard heat guns. Larger diameters benefit from a wide-nozzle heat gun for even coverage.
⚡Clean Black Finish — Black is the standard color for ground wires, negative leads, and general-purpose cable sleeving in automotive, marine, and industrial wiring — providing a professional appearance on finished installations.

📐 Technical Specifications — Black Heat Shrink Tubing

Product Type	Black 2:1 Heat Shrink Tubing
Color	Black
Shrink Ratio	2:1
Material	Polyolefin
Diameter Range (Pre-Shrink)	Φ0.6mm (≈0.024\") to Φ210mm (≈8.3\") — 43 sizes
Post-Shrink Diameter	Approximately 50% of pre-shrink diameter
Available Lengths	1M (≈39\"), 3M (≈118\"), 5M (≈197\"), 10M (≈394\"), 25M (≈984\")
Activation Temperature	Typically 90–120°C (194–248°F)
Recommended Tool	Heat gun (wide-nozzle recommended for Φ50mm+)
Typical Applications	Automotive wiring, marine electrical, cable bundles, electronics, DIY repairs
Voltage Rating	Contact us to confirm for your specific application
Supply Format	Cut-to-length roll

❓ Frequently Asked Questions

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

Measure the outer diameter (OD) of the wire, connector, or cable bundle you need to cover. Choose a pre-shrink tube diameter that is slightly larger than that measurement so the tubing slides on easily before heat is applied. After shrinking, the 2:1 ratio reduces the inner diameter to approximately half. For example, a Φ10mm (≈13/32\") tube shrinks to approximately Φ5mm (≈3/16\"). When in doubt, size up by one step.

What does the 2:1 shrink ratio mean in practice?

A 2:1 ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. This applies across all 43 sizes in this listing. A Φ20mm (≈3/4\") tube shrinks to roughly Φ10mm (≈3/8\"), and a Φ100mm (≈4\") tube shrinks to roughly Φ50mm (≈2\"). The tubing does not stretch back once shrunk, so always cut a piece slightly longer than the area you need to cover.

Can this tubing be used for automotive or marine wiring?

Yes. Polyolefin heat shrink tubing is generally suitable for automotive wire harness protection, marine electrical connections, and outdoor installations where wires are exposed to moisture, vibration, and temperature fluctuations. For fully submersed or chemically aggressive environments, contact us to confirm suitability before use.

What tool do I need, and does it change for larger diameters?

A heat gun is the recommended tool for all sizes. For small diameters (Φ0.6mm–Φ10mm), a standard heat gun nozzle works well. For larger diameters (Φ50mm and above), a wide-nozzle or reflector attachment is recommended to ensure even heat distribution around the full circumference of the tube. Avoid using a lighter or open flame on larger sizes, as uneven heat can cause the tube to shrink unevenly or scorch.

Is this tubing suitable for high-voltage or industrial power applications?

This tubing provides a solid dielectric barrier suitable for low-voltage DC applications such as 12V and 24V automotive and marine systems, and general electronics. For high-voltage AC or industrial power applications, contact us to confirm the voltage rating before use, as requirements vary by application and jurisdiction.

How do I choose between 1m, 3m, 5m, 10m, and 25m lengths?

For a single repair, 1 meter (≈39\") is generally sufficient. For wiring a full vehicle or boat, 5 meters (≈197\") or 10 meters (≈394\") offers better value. For workshop stock or large industrial cable bundle projects, the 25 meter (≈984\") roll provides the lowest cost per meter and ensures you won’t run short mid-job. Many technicians keep a 25m roll of their most-used diameter on hand as a shop staple.

Why choose black heat shrink tubing over other colors?

Black is the industry-standard color for ground wires, negative leads, and general-purpose cable sleeving in automotive, marine, and industrial wiring. It provides a clean, professional appearance on finished installations and is less likely to show dirt or discoloration over time compared to lighter colors. If you need color-coded wiring for circuit identification, see our multi-color heat shrink tubing listings.

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

Black Heat Shrink Tubing 2:1 – Φ0.6mm to Φ210mm Wire Sleeving

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Black Heat Shrink Tubing 2:1 — One Listing, Every Size from Φ0.6mm to Φ210mm

✅ Key Features of These Black Heat Shrink Tubes

📐 Technical Specifications — Black Heat Shrink Tubing

❓ Frequently Asked Questions

Black Heat Shrink Tubing 2:1 – Φ0.6mm to Φ210mm Wire Sleeving

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