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65Ft 5/16 Inch Heat Shrink Tubing Roll

$39.99 USD

A tailored sleeve for your next connection.
Avoid treating every wire joint as though it needs the same sleeve length.
• 5/16-inch starting diameter — verify clearance over the joint and the recovered fit.
• 3:1 shrink ratio — helps the sleeve recover around compatible changes in diameter.
• 65ft continuous supply — cut the required length; the heated adhesive lining helps.

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65Ft 5/16 Inch Heat Shrink Tubing Roll provides a continuous 65-foot length of 3:1 dual-wall, adhesive-lined tubing for sealing, insulating, strain relief, and color identification on compatible wire and cable joints. The supplied inner diameter is at least 7.9mm and the fully recovered inner diameter is no more than 2.7mm.

Specifications
Before Diameter Recovered Diameter Shrink Ratio Wall Thickness Length Temperature/Application
5/16 inch / 7.9mm; supplied ID ≥7.9mm Fully recovered ID ≤2.7mm 3:1 1.35 ± 0.3mm total wall; 0.45 ± 0.2mm adhesive layer 65 ft roll Shrink temperature 257°F / 125°C; cable insulation, sealing, and strain relief

 

For other diameters and formats, browse the heat shrink tubing collection.

Specification table for wire crimper and stripper tool sizes

❓What does the 3:1 shrink ratio mean?

The tubing can recover to about one-third of its supplied diameter when heated correctly. This 7.9mm size has a specified fully recovered inner diameter of no more than 2.7mm.

❓How do I choose the correct tubing diameter?

The expanded size must clear the largest component, while the recovered size must seal tightly around the smallest section. Do not choose by wire gauge alone.

❓Can I shrink the tubing with an open flame?

Use a controlled heat gun. An open flame can scorch the sleeve, damage nearby insulation, and create an uneven adhesive seal.

❓How to Choose

Measure the largest diameter the tubing must slide over and the smallest diameter it must seal after heating. Confirm the supplied inner diameter of at least 7.9mm clears the connection and the recovered inner diameter of no more than 2.7mm will seal the finished joint. Select color by the project identification standard rather than by wire gauge alone.

❓How to Use

  1. Disconnect power, cut the required tubing length, and slide it over the cable before completing the connection.
  2. Center the tubing over the finished joint with sufficient overlap on both sides.
  3. Apply controlled heat evenly from the center outward while keeping the heat source moving.
  4. Stop heating after the tubing has fully recovered and the adhesive has formed an even seal.
  5. Allow the joint to cool before bending, pulling, testing, or restoring power.
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  • Delivery Time: 1-2 business days to The US and Canada. Delivery times may vary depending on your location and carrier conditions.
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  • Tracking: After your order is shipped, you will receive an email with a tracking number to monitor the delivery status.
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  • 30-Day Returns
    You may request a return within 30 calendar days of delivery. Items must be unused, in their original condition, and include all original packaging and accessories.
  • Damaged, Defective, or Incorrect Items
    Contact us with your order number and photos. If the issue is due to our error, we will cover reasonable return shipping costs or provide an appropriate replacement.
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    Approved refunds are issued to your original payment method within 5 business days after inspection. Your bank may require additional processing time.
  • To start a return, email support@haisstronica.com with your order number and reason for return. Please obtain approval before sending anything back.
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  • Good Sealing:Our heat shrink tubing provides a tight and secure seal to protect your wires and cables from water, dust and other contaminants
  • Easy to Cut and Install:With its 3:1 shrink ratio, this heat shrink tubing shrinks to 1/3 of its original diameter, making it easy to fit a variety of wire sizes
  • Waterproof:The adhesive lining in heat shrink tubing creates a watertight seal as it cools, providing excellent protection against water, moisture and corrosion
  • 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 5/16-inch tubing for compatible automotive, marine, equipment, appliance, and workshop wiring where the sleeve must seal around a medium cable joint or harness section. Blue, red, green, yellow, and black variants support project identification. Do not use it where the 7.9mm starting diameter cannot pass over the largest part of the connection or the recovered diameter cannot grip the smallest section.

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