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Black 4:1 Heat Shrink Tubing Kit

$9.99 USD
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Size:1/2"
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Black 4:1 Heat Shrink Tubing Kit provides adhesive-lined, dual-wall protection for cable insulation, joint sealing, strain relief, and abrasion resistance. Choose one available diameter to fit the largest part of the connection before heating; the tubing can recover to approximately one quarter of its original diameter.

Size & Pack Guide

Before Diameter Nominal Recovered Diameter Published Pack Length Shrink Ratio Wall Thickness Material / Sealing Recommended Application
1/8 in (3.2 mm) Approx. 1/32 in (0.8 mm) 10 ft total 4:1 Not published Dual-wall plastic, self-adhesive lining Fine wires and small splices
3/16 in (4.8 mm) Approx. 3/64 in (1.2 mm) 10 ft total 4:1 Not published Dual-wall plastic, self-adhesive lining Small wire joints and terminals
1/4 in (6.4 mm) Approx. 1/16 in (1.6 mm) Check selected variant media 4:1 Not published Dual-wall plastic, self-adhesive lining Wire splices and connector bodies
3/8 in (9.5 mm) Approx. 3/32 in (2.4 mm) Check selected variant media 4:1 Not published Dual-wall plastic, self-adhesive lining Medium cable joints and bundles
1/2 in (12.7 mm) Approx. 1/8 in (3.2 mm) 10 ft total 4:1 Not published Dual-wall plastic, self-adhesive lining Larger connectors and cable joints
3/4 in (19.1 mm) Approx. 3/16 in (4.8 mm) 10 ft total 4:1 Not published Dual-wall plastic, self-adhesive lining Large cable joints and harnesses
2 in (50.8 mm) Approx. 1/2 in (12.7 mm) Check selected variant media 4:1 Not published Dual-wall plastic, self-adhesive lining Large cable bundles and assemblies

Recovered diameters are nominal values calculated from the published 4:1 ratio. Pack length varies by selected diameter; where the current product media does not publish a length, confirm the selected variant before checkout. Wall thickness and a numeric heating-temperature range are not published on this page.

❓What sizes are available?

The current storefront offers 1/8, 3/16, 1/4, 3/8, 1/2, 3/4, and 2-inch before-shrink diameters. Availability can vary by variant.

❓How do I choose the correct 4:1 size?

Choose tubing that slides over the widest part of the connection and can recover below the diameter of the narrowest section. A 4:1 ratio means the tubing can shrink to approximately one quarter of its supplied diameter.

❓Is this heat shrink tubing adhesive-lined?

Yes. The product is listed as self-adhesive, dual-wall tubing designed to insulate and help seal the covered connection.

❓How much tubing is included?

Published product media confirms 10 ft total for the 1/8, 3/16, 1/2, and 3/4-inch options. Check the selected variant media before checkout for any diameter whose pack length is not displayed in the guide.

❓What heating temperature should I use?

A numeric heating-temperature range is not published on this page. Use controlled heat, keep the heat source moving, and stop once the tubing has recovered evenly and the adhesive seal is visible.

❓How to Choose the Right Size

Measure the widest part the tubing must pass over, including the connector or splice. Choose a before-shrink diameter larger than that point, then confirm the nominal recovered diameter is smaller than the cable or joint you want to seal. The 4:1 ratio is especially useful where the joint is much wider than the wire. Choose 54FT for repeat workshop or fleet use and 21FT for occasional repairs.

❓How to Install

  1. Disconnect power, clean the cable or joint, and cut the required tubing length.
  2. Slide the tubing over the cable before completing any permanent connection.
  3. Center the tubing over the joint and apply controlled heat, moving from the center toward both ends.
  4. Rotate the assembly so the sleeve recovers evenly and the adhesive seals the edges.
  5. Stop heating when recovery is complete and allow the joint to cool before handling or restoring power.

Avoid open flame and overheating. The listing does not provide a numeric temperature range, so use controlled, even heat and follow the heat-tool instructions. Browse more heat shrink tubing, compare the 5-color 4:1 heat shrink tubing kit, or use a 350W mini heat gun for controlled heating.
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Learn More About Porduct

  • 4:1 Shrink Ratio: it can shrink to 1/4 of the original diameter,Shrink tighter and seal better than 3:1 and 2:1.
  • Good Seal: The supplied adhesive coating provides a strong and durable seal that protects your wires from moisture, dirt and other external elements. Say goodbye to loose connections and potential short circuits
  • Crystal Clear:Inspect Connections Through the Tube — Transparent body lets you visually verify solder joints, crimp quality, and adhesive flow after installation. Also works as label protection — slide over printed wire markers to keep them readable, waterproof, and scratch-resistant.
  • Wider Application: Heat shrink tubing is used for marine and automotive wiring, wire connections and DIY electrical wiring projects. For all your needs


Use this black adhesive-lined tubing for automotive and marine wiring, cable joints, connector transitions, battery leads, workshop repairs, and DIY electrical projects. The dual-wall construction adds insulation and mechanical protection, while the inner adhesive helps seal against moisture and dirt. Do not use it as a substitute for a connector, on energized wiring, or where a project requires a certified material or temperature rating that is not listed.

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