45mm Heat Shrink Tubing — Reliable Insulation for Large Cable Bundles & Automotive Wiring
Dealing with exposed wire ends, fraying cable bundles, or unprotected harness connections? Whether you're rewiring a vehicle, tidying up a workshop panel, or protecting outdoor electrical runs, finding heat shrink tubing that actually fits large-diameter cables without splitting or sliding off is a real challenge. This 45mm heat shrink tubing is built for exactly those jobs — giving electricians, automotive technicians, and serious DIYers a dependable sleeve that goes on easily and locks down tight.
Each order includes a continuous length of 2:1 ratio heat shrink tubing with a 45mm (≈1.77") inner diameter before shrinking, recovering to approximately 22–23mm after heat is applied. Available in seven colors — Black, White, Red, Green, Yellow, Blue, and Transparent — and in cut lengths of 1 metre (≈3.3 ft), 2 metres (≈6.6 ft), 5 metres (≈16.4 ft), and 10 metres (≈32.8 ft). Made from flexible polyolefin material with flame-retardant properties.
Typical applications include automotive wiring harness protection, battery terminal insulation, large conduit end-capping, marine cable management, and color-coded wire identification in control panels. The transparent variant is especially useful when you need to keep labels or wire markings visible after installation.
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Compatibility Note: This tubing has a pre-shrink inner diameter of 45mm (≈1.77"). It is designed for cable bundles, conduit ends, and large connectors up to approximately 44mm in diameter. For smaller wire gauges, see our other heat shrink tubing sizes.
✅ Key Features of These 45mm Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Shrinks to approximately half its original diameter, creating a firm, gap-free seal around large cable bundles and automotive wiring harnesses.
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🎨7 Color Options — Black, White, Red, Green, Yellow, Blue, and Transparent allow color-coded wire identification and meet common electrical wiring conventions.
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📏Four Length Options — Choose 1m, 2m, 5m, or 10m to match your project scope, from single-run repairs to bulk workshop stock for electrical cable wrap jobs.
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🛡️Flame-Retardant Polyolefin — Typically self-extinguishes when the heat source is removed, making it suitable for automotive engine bays and enclosed electrical enclosures.
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💧Moisture & Abrasion Resistance — Provides a protective barrier against moisture ingress, dust, and mechanical abrasion — ideal for outdoor electrical connections and underhood wiring.
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⚡Flexible After Shrinking — Remains pliable once cooled, so it won't crack or stiffen in cold environments, keeping your wire wrap sleeve intact over time.
📐 Technical Specifications — 45mm Heat Shrink Tubing
| Inner Diameter (Before Shrink) |
45mm (≈1.77") |
| Recovered Diameter (After Shrink) |
Typically ≈22–23mm (≈0.87–0.91") |
| Shrink Ratio |
2:1 |
| Material |
Polyolefin (flame-retardant) |
| 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) |
| Wall Thickness (Before Shrink) |
See variant options |
| Operating Temperature Range |
Contact us to confirm |
| Shrink Temperature |
Contact us to confirm |
| Voltage Rating |
Contact us to confirm |
| Applicable Standards |
Contact us to confirm |
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Spec Confirmation: Operating temperature, voltage rating, and wall thickness vary by production batch. If your application has strict electrical or thermal requirements, please contact us before ordering to confirm the exact specification.
❓ Frequently Asked Questions
What length of heat shrink tubing do I need?
Measure the total length of wire or cable you need to cover, then add 10–15% extra for overlap and trimming. For a single automotive harness run, 1–2 metres is typically sufficient. For larger wiring projects or workshop stock, the 5 or 10 metre options offer better value per metre. As a reference: 1 metre ≈ 3.3 ft, 5 metres ≈ 16.4 ft, 10 metres ≈ 32.8 ft.
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 45mm tubing will generally recover to around 22–23mm, providing a snug, secure fit over the covered component. Always verify your cable bundle's outer diameter is under 44mm before ordering.
Can this heat shrink tubing be used outdoors or in automotive applications?
Yes. This tubing is generally suitable for automotive wiring harnesses, engine bay cable management, and outdoor electrical connections. It provides insulation and moisture resistance in most standard environments. For prolonged submersion or extreme chemical exposure, contact us to confirm suitability before ordering.
Is this tubing flame-retardant?
Heat shrink tubing of this type is typically manufactured with flame-retardant polyolefin material, which self-extinguishes when the heat source is removed. Contact us to confirm the specific flame-retardant rating if your application requires compliance with a particular standard (e.g., UL, RoHS).
What tool do I use to shrink this tubing?
A heat gun is the recommended tool for even, controlled shrinking. Set it to a medium heat setting and move it steadily along the tubing to avoid hot spots. In a pinch, a lighter can work for small sections, but a heat gun gives more consistent results. Avoid direct flame contact with the tubing surface to prevent scorching.
What wire or cable diameter fits inside 45mm heat shrink tubing?
The inner diameter before shrinking is 45mm (≈1.77"). This makes it suitable for covering large cable bundles, conduit ends, battery terminals, or thick wiring harnesses. After shrinking, the recovered diameter is typically around 22–23mm (≈0.87–0.91"). Always measure your cable bundle's outer diameter before selecting a size — the bundle should be smaller than 45mm to slide the tubing on easily.
Which color should I choose for electrical wiring?
Color choice is typically based on wiring convention or personal preference. Black is the most common for general electrical use. Red is often used for positive leads, while other colors help with color-coded cable identification in complex wiring systems. Transparent tubing lets you see the wire or label underneath — useful for inspection or when wire markings need to remain visible after installation.
🛒 Select your color and length above, then add to cart — ships from our US warehouse.
