70mm Heat Shrink Tubing — Reliable Insulation for Large-Diameter Cable Wrapping
When you're dealing with thick cable bundles, large automotive connectors, or exposed wire splices that need a clean, durable finish, finding the right-sized heat shrink tubing matters. Undersized tubing won't slide over the connector; oversized tubing won't grip tightly enough. This 70mm heat shrink tubing with a 2:1 shrink ratio is built for exactly those larger-diameter applications — giving electricians, automotive technicians, and serious DIYers a dependable solution for cable insulation and wire management.
Each piece is a single continuous length of polyolefin heat shrink tubing with an inner diameter of 70mm (≈2.76") before shrinking, reducing to approximately 35mm (≈1.38") after heat is applied. Available in lengths of 1 metre (≈3.3 ft), 2 metres (≈6.6 ft), 5 metres (≈16.4 ft), and 10 metres (≈32.8 ft), and offered in seven colors — Black, White, Red, Green, Yellow, Blue, and Transparent — so you can match your wiring convention or color-code your installation.
Typical use cases include protecting large automotive wiring harness splices, insulating marine electrical connections exposed to moisture, bundling and labeling industrial cable runs, and covering terminal ends on heavy-gauge power cables. Whether you're rewiring a vehicle, building a custom electrical panel, or managing cables in a workshop, this large-diameter heat shrink sleeve keeps connections protected and organized.
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Compatibility: Fits cables and connectors with an outer diameter up to approximately 35mm (≈1.38") after shrinking. Suitable for standard round cables, butt connectors, ring terminals, and wire bundles used in automotive, marine, and general electrical wiring.
✅ Key Features of These 70mm Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Shrinks from 70mm (≈2.76") down to approximately 35mm (≈1.38"), creating a firm, snug fit around large cables and connectors without gaps or loose ends.
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🎨7 Color Options — Available in Black, White, Red, Green, Yellow, Blue, and Transparent for color-coded wire identification and organized cable management in automotive and electrical installations.
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📏Flexible Length Selection — Choose from 1m, 2m, 5m, or 10m cuts so you buy only what your project needs — ideal for both single-splice repairs and longer cable insulation runs.
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🛡️Moisture & Abrasion Resistance — Polyolefin construction typically provides resistance to moisture, mild chemicals, and physical abrasion, helping protect wire splices in under-hood and outdoor environments.
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⚡Electrical Insulation — Provides a protective insulating layer over exposed conductors, splices, and terminal connections, reducing the risk of short circuits in low- to medium-voltage wiring applications.
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✂️Easy to Cut & Apply — Can be cut to any length with standard scissors or a utility knife, then shrunk evenly with a heat gun for a clean, professional-looking finish on large-diameter cable wrap jobs.
📐 Technical Specifications — 70mm Heat Shrink Tubing
| Product Type |
Heat Shrink Tubing Sleeve |
| Inner Diameter (Before Shrink) |
70mm (≈2.76") |
| Inner Diameter (After Shrink) |
Approximately 35mm (≈1.38") |
| Shrink Ratio |
2:1 |
| Available Lengths |
1m (≈3.3 ft) / 2m (≈6.6 ft) / 5m (≈16.4 ft) / 10m (≈32.8 ft) |
| Available Colors |
Black, White, Red, Green, Yellow, Blue, Transparent |
| Material |
Polyolefin (typically) |
| Wall Thickness (After Shrink) |
See variant options |
| Operating Temperature Range |
Contact us to confirm |
| Shrink Temperature |
Contact us to confirm |
| Voltage Rating |
Contact us to confirm |
| Application Method |
Heat gun recommended |
| Suitable For |
Automotive, marine, electrical, DIY wiring |
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Note: If your application requires specific voltage ratings, operating temperatures, or chemical resistance specs, please contact us before ordering to confirm suitability.
❓ Frequently Asked Questions
How do I choose the right length of heat shrink tubing?
Measure the total length of the cable or splice you need to cover, then add at least 10–20% extra to account for overlap and shrinkage. For example, a 500mm (≈19.7") run would typically need at least 600mm of tubing. We offer lengths from 1 metre (≈3.3 ft) up to 10 metres (≈32.8 ft) so you can buy exactly what your project requires.
What does 2:1 shrink ratio mean?
A 2:1 ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. This 70mm tubing will generally shrink down to around 35mm (≈1.38"), creating a firm, insulating sleeve around your cable or connector.
How strong is the insulation — can it handle high-voltage wiring?
Heat shrink tubing of this type is generally rated for low- to medium-voltage electrical applications. For high-voltage or safety-critical installations, please confirm the dielectric rating with us before ordering.
Is this tubing suitable for outdoor or automotive use?
Standard polyolefin heat shrink tubing is typically resistant to moisture, UV exposure, and common automotive fluids, making it suitable for most outdoor and under-hood applications. For prolonged submersion or extreme chemical exposure, contact us to confirm suitability.
What connector or cable standards is this compatible with?
This tubing is designed to fit over cables, connectors, and splices with an outer diameter up to approximately 35mm after shrinking. It is not thread-specific and works with standard round cables, butt connectors, and terminal ends commonly used in automotive, marine, and electrical wiring.
What tool do I need to shrink the tubing?
A heat gun is the recommended tool for even, controlled shrinking. In a pinch, a lighter or hair dryer can work for small sections, but a heat gun generally produces a cleaner, more uniform result. Avoid direct flame contact to prevent scorching.
Which color should I choose for my wiring project?
Color choice is typically based on your wiring convention or personal preference. Black is the most common for general electrical use. Red is often used for positive leads, while other colors (Blue, Green, Yellow, White) help with color-coded wire identification. Transparent allows you to see the underlying cable or label through the sleeve.
🛒 Select your color and length above, then add to cart — ships from our US warehouse.
