50mm Heat Shrink Tubing — Reliable Insulation for Large Cables & Wire Bundles
When you're working with large-gauge battery cables, marine wiring looms, or industrial wire harnesses, standard small-diameter sleeving simply won't cut it. Electricians, auto technicians, marine riggers, and DIY builders who deal with thick cable runs need a 50mm heat shrink tubing solution that slides on easily, shrinks uniformly, and stays put under heat, vibration, and moisture.
Each order covers a continuous length of polyolefin heat shrink tubing with a supplied inner diameter of 50mm (≈2") and a 2:1 shrink ratio — meaning it shrinks down to approximately 25mm (≈1") once heat is applied. Available in lengths from 1 Meter (≈39.4") up to 10 Meters (≈393.7"), and in 7 colors: Black, White, Red, Green, Yellow, Blue, and Transparent. The tubing wall is flexible before and after shrinking, conforming closely to irregular cable profiles.
Typical use cases include protecting and insulating large automotive battery cable splices, bundling and color-coding marine wiring looms for easy identification, and providing mechanical protection over hydraulic hose fittings or industrial cable assemblies where abrasion resistance and a clean finish are both required.
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Compatibility: Fits cables, wire bundles, and connectors up to 50mm (≈2") in diameter before shrinking. Shrinks to approximately 25mm (≈1"). Suitable for automotive, marine, industrial, and DIY electrical applications. Not adhesive-lined — for waterproof sealing, see our dual-wall adhesive-lined range.
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Note: Always measure your cable or connector outer diameter before ordering. If your cable OD is close to 50mm, confirm fit before cutting. Contact us to confirm wall thickness or certification requirements for your specific application.
✅ Key Features of These 50mm Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Shrinks from 50mm (≈2") down to approximately 25mm (≈1"), creating a firm, conforming sleeve ideal for large cable wire heat shrink applications.
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🛡️Flame-Retardant Polyolefin — Made from polyolefin material that is generally flame-retardant and resistant to moisture, mild chemicals, and UV exposure for outdoor and marine wiring use.
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🎨7 Color Options — Choose from Black, White, Red, Green, Yellow, Blue, or Transparent to match wiring color codes or make cable identification easier in complex harnesses.
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📏Flexible Length Selection — Available in 1, 2, 3, 4, 5, 8, and 10 Meter cuts, so you can order exactly what you need for a single repair or a full electrical sleeve cable wire installation run.
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⚡Low Activation Temperature — Typically activates at around 70°C (158°F), allowing even shrinkage with a standard heat gun without scorching the underlying cable insulation.
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🔧Clean, Professional Finish — The tubing conforms tightly to round and irregular cable profiles, providing a neat, abrasion-resistant finish suitable for automotive battery cables, marine looms, and industrial wiring harnesses.
📐 Technical Specifications — 50mm Heat Shrink Tubing
| Supplied Inner Diameter |
50mm (≈2") |
| Shrink Ratio |
2:1 |
| Recovered Inner Diameter |
Approximately 25mm (≈1") |
| Material |
Polyolefin |
| Flame Retardant |
Yes (generally meets standard flame-retardant requirements) |
| Activation Temperature |
Typically 70–120°C (158–248°F) |
| Operating Temperature Range |
Typically -55°C to +125°C (-67°F to +257°F) |
| Wall Thickness (before shrink) |
See variant options |
| Available Colors |
Black, White, Red, Green, Yellow, Blue, Transparent |
| Available Lengths |
1m (≈39.4"), 2m (≈78.7"), 3m (≈118.1"), 4m (≈157.5"), 5m (≈196.9"), 8m (≈314.9"), 10m (≈393.7") |
| Adhesive Lining |
No (single-wall, non-adhesive) |
| Suitable Applications |
Automotive, marine, industrial, DIY electrical |
| Certification |
Contact us to confirm |
❓ Frequently Asked Questions
How do I choose the right length of 50mm heat shrink tubing?
Measure the total run of cable or wire bundle you need to cover, then add at least 10–15% extra for overlap and trimming. For example, a 1-meter (≈39.4") section covers most single-joint repairs, while 5–10 meter rolls are generally better suited for wiring harnesses or panel builds where continuous coverage is needed.
What shrink ratio does this tubing use, and what does 2:1 mean?
A 2:1 shrink ratio means the tubing shrinks to approximately half its supplied inner diameter when heat is applied. This 50mm tubing will typically shrink down to around 25mm (≈1"), creating a firm, conforming sleeve around the underlying cable or connector.
Can this heat shrink tubing be used outdoors or in marine environments?
Polyolefin heat shrink tubing is generally resistant to moisture, UV exposure, and mild chemicals, making it suitable for outdoor and marine wiring applications in most cases. For fully submerged or salt-spray environments, we recommend confirming the specific wall thickness and sealing requirements with our team.
What cables or connectors is 50mm heat shrink tubing compatible with?
With a supplied inner diameter of 50mm (≈2"), this tubing is typically compatible with large-gauge wire bundles, battery cables, marine wiring looms, hydraulic hose protection, and large automotive or industrial connectors. It fits any round or irregular cross-section up to approximately 50mm before shrinking.
Is this tubing flame-retardant and safe for electrical use?
Yes. Polyolefin heat shrink tubing of this type is generally manufactured to meet flame-retardant standards, making it suitable for electrical insulation, wire bundling, and cable management in automotive, marine, and industrial settings. Always verify the specific rating if your application requires UL or RoHS certification.
What tool do I need to shrink this tubing?
A heat gun is the recommended tool for shrinking 50mm tubing evenly. The activation temperature is typically around 70–120°C (158–248°F). Move the heat gun slowly along the length of the tubing for uniform shrinkage. A lighter or open flame can be used in a pinch but may cause uneven shrinkage or scorching.
Which color should I choose for my wiring project?
Color choice is typically based on wiring convention or personal preference. Black is the most common for general insulation and UV resistance. Red and blue are often used for positive/negative identification in automotive or marine wiring. Transparent allows you to see the underlying cable markings after installation.
🛒 Select your color and length above, then add to cart — ships from our US warehouse.
