2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve
2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve
2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve
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2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve

2:1 Heat Shrink Tubing Black – 20mm to 180mm Diameter, 20cm Sleeve

HomeDIYer
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By HomeDIYer®

Price:
$1.35 USD
Stock:
In stock (500 units), ready to be shipped

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Description

2:1 Heat Shrink Tubing — Reliable Cable Protection from 20mm to 180mm

Whether you're splicing wires in your garage, repairing an automotive harness, or bundling cables in a control panel, finding heat shrink tubing that actually fits large-diameter cables can be a real challenge. This 2:1 heat shrink tubing is designed for DIYers, electricians, and hobbyists who need a dependable, flame-retardant sleeve that covers everything from small wire bundles to thick multi-conductor cables.

Each piece is a single 20cm (≈7.9") sleeve in solid black, available in 15 diameters ranging from 20mm (≈3/4") up to 180mm (≈7.1"). The tubing is made from flexible polyolefin material with a 2:1 shrink ratio — meaning it shrinks to approximately half its listed diameter when heat is applied. You can purchase 1, 2, 5, or 10 pieces per order to match your project quantity.

Typical use cases include automotive wiring harness repair, protecting cable splices and terminal connections, bundling multi-conductor cables in marine or RV installations, and organizing wire runs in DIY electronics projects. The wide diameter range makes it especially useful for large-gauge wire wrap and heavy cable sleeve applications that standard small-diameter tubing can't cover.

ℹ️ Compatibility Note: This tubing fits any round cable or bundle whose outer diameter is up to approximately half the listed size (2:1 ratio). For example, a 40mm tube shrinks down to roughly 20mm. Select your diameter based on your cable's pre-wrap outer diameter.

✅ Key Features of These 2:1 Heat Shrink Tubing Sleeves

  • 🔥2:1 Shrink Ratio — Shrinks to approximately half its original inner diameter, conforming snugly around cables, connectors, and wire splices for a clean, secure finish.
  • 📏Wide Diameter Range — Available from 20mm (≈3/4") to 180mm (≈7.1"), covering small wire bundles through large multi-conductor cables and wiring harnesses.
  • 🛡️Flame-Retardant Polyolefin — The polyolefin construction is generally flame-retardant and resists moisture, making it suitable for automotive wiring repair and electrical DIY projects.
  • ⚡Electrical Insulation — Provides a protective insulating layer over splices and bare conductors, helping prevent short circuits and reducing abrasion wear on cable jackets.
  • ✂️Easy to Cut and Position — Each 20cm (≈7.9") sleeve can be trimmed to length with standard scissors before shrinking, giving you precise coverage for cable sleeve and wire wrap applications.
  • 📦Flexible Quantity Options — Order 1, 2, 5, or 10 pieces per size so you can stock exactly what you need for a single repair or a larger wiring project without over-buying.

📐 Technical Specifications — 2:1 Heat Shrink Tubing

Product Type Heat Shrink Tubing
Shrink Ratio 2:1
Color Black
Sleeve Length 20cm (≈7.9")
Available Diameters 20mm (≈3/4"), 25mm (≈1"), 28mm (≈1.1"), 35mm (≈1.4"), 40mm (≈1.6"), 45mm (≈1.8"), 50mm (≈2"), 60mm (≈2.4"), 70mm (≈2.8"), 80mm (≈3.1"), 90mm (≈3.5"), 100mm (≈3.9"), 120mm (≈4.7"), 150mm (≈5.9"), 180mm (≈7.1")
Material Polyolefin (flame-retardant)
Shrink Temperature Typically 90–120°C (194–248°F)
Quantity Options 1 Pcs, 2 Pcs, 5 Pcs, 10 Pcs
Application Method Heat gun recommended
Minimum Shrink Diameter See variant options (approx. 50% of listed diameter)
Wall Thickness (after shrink) Contact us to confirm
Voltage Rating Contact us to confirm
⚠️ Sizing Tip: Always measure your cable's outer diameter before ordering. The listed diameter is the tubing's pre-shrink inner diameter. For a snug fit, choose a size that is 10–20% larger than your cable's outer diameter.

❓ Frequently Asked Questions

How do I choose the right diameter for my wire or cable?

Measure the outer diameter of the cable or bundle you need to cover. Choose a heat shrink size whose pre-shrink inner diameter is at least 10–20% larger than your cable. For example, a 25mm (≈1") tube works well on cables typically up to about 12mm in diameter after shrinking. When in doubt, size up — you can always apply gentle heat to get a snug fit.

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. So a 40mm tube will shrink down to roughly 20mm, conforming tightly around your cable or connector.

How strong is this heat shrink tubing — can it handle mechanical stress?

This tubing is generally made from polyolefin, which provides good tensile strength and resistance to abrasion. It is suitable for protecting wiring harnesses, cable splices, and connectors from mechanical wear in most DIY and light industrial applications. For high-tension or heavy-duty environments, contact us to confirm suitability.

Is this heat shrink tubing suitable for outdoor or wet environments?

Standard 2:1 polyolefin heat shrink tubing is generally moisture-resistant and can handle typical outdoor exposure. However, it is not a waterproof seal on its own. For fully waterproof applications, consider adhesive-lined (3:1 or 4:1) heat shrink tubing instead. Contact us to confirm if you have specific IP-rating requirements.

What thread or connector standards is this compatible with?

Heat shrink tubing is not thread-specific — it works over any round or near-round cable, wire bundle, connector, or terminal. The 20mm–180mm diameter range covers most standard wire gauges, multi-conductor cables, and large wiring harnesses used in automotive, marine, and electrical DIY projects.

How do I apply this heat shrink tubing correctly?

Slide the tubing over the cable or splice before making the connection. Once in position, apply even heat using a heat gun set to typically 90–120°C (194–248°F), moving it back and forth until the tubing shrinks uniformly. Avoid open flames, which can scorch or uneven-shrink the material.

Can I use this for automotive wiring repairs?

Yes. This black heat shrink tubing is commonly used for automotive wiring harness repair, protecting spliced wires, and bundling cables under the hood or in the cabin. The flame-retardant properties and flexibility make it well-suited for automotive DIY and professional repair work.

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

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