Shrinkflex® Heat Shrink End Caps

Don't Forget the Ends - Protect the Whole Cable

We Guarantee to Have the Best Price

What's special about Shrinkflex® Heat Shrink Cable End Caps?

  • Insulates and seals off wire and splice terminations to protect against abrasion, moisture, chemicals, and corrosion.
  • Wide array of applications including automotive, electrical, and networking.
  • The End Cap is adhesive lined to bond with the heat shrink it overlaps.
  • Available in sizes from 3/8" to 5" in diameter to provide a fit around the cables' end.
  • Click for More Features

Just like heat shrink tubing, heat shrink end caps are perfect for situations that call for extra protection against abrasion, moisture, chemicals and corrosion. Heat shrink end caps are most commonly used to insulate and seal off wire and splice terminations in automotive, electrical and networking applications. End caps are typically used in conjunction with heat shrink tubing… heat shrink caps take over where the tubing leaves off!

Part # Size ID Before
ID After
Wall After
Length Before
HAC0.38BK 3/8" 0.39" 0.16" 0.08" 1.34"
HAC0.50BK 1/2" 0.55" 0.18" 0.08" 1.77"
HAC0.75BK 3/4" 0.79" 0.24" 0.09" 2.56"
HAC1.00BK 1" 1.00" 0.31" 0.09" 2.76"
HAC1.50BK 1-1/2" 1.38" 0.59" 0.12" 3.35"
HAC2.00BK 2" 2.17" 1.00" 0.13" 4.33"
HAC3.00BK 3" 2.95" 1.38" 0.14" 5.12"
HAC4.00BK 4" 3.94" 1.97" 0.16" 6.10"
HAC5.00BK 5" 4.72" 2.36" 0.16" 6.10"

Heat shrink tubing is capable of sealing the entire surface of a cable or wire, but can’t be closed off at the end should that be necessary. That’s where heat shrink end caps come into play: they’re shaped to fit over the ends of wires and cables. Our heat shrink end caps are adhesive lined, so that when one is fitted over the end of a wire, it forms a bond with the heat shrink tubing that it’s overlapping. The seal is completed when heat is applied: the adhesive melts and becomes fully activated, and the end cap material shrinks to a snug and exact fit around the cable’s end.


Property Test Method Values
Operating Temperature Range n/a -67° to 230° (-55°C to 110°C)
Shrink Temperature n/a 248°F (120°C)
Tensile Strength ISO 37 14 Mpa minimum
Ultimate Elongation ISO 37 400% minimum
Specific Gravity ISO 1183 1.95 maximum
Electric Strength IEC 243 15KV/mm minimum
Corrosion(Copper Contact and Copper Mirror) ASTM D2671 no corrosion
Water Absorption ISO 62 0.5% maximum

Fluid Resistance

Lubricating Oil
Hydraulic Fluid
- Tensile Strength
- Ultimate Elongation

ISO 1817

ISO 37

8.8 MPA minimum
400% minimum

Fungus Resistance ISO 846 no fungal growth
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How-To Corner



Limiting Oxygen Index (LOI)

The ratio of how much oxygen - as compared to other gases - needs to be present in the air surrounding a particular material in order for that material to burn. The fact that Earth's normal atmospheric air contains around 21% oxygen is used a reference point when materials are classified into burn categories that are based on Limiting Oxygen Index. Substances that are combustible in air containing less than 21% oxygen are considered flammable, while those that burn in the range of anything greater than 21% but less than 28% are typically labeled "slow burning". Any material with an LOI that exceeds 28% is classified as self-extinguishing.

In the table below, you'll find a list of polymers commonly found in our heat shrink tubing and braided sleeving products, along with their LOIs and the burn categories each falls into.

ECTFE (Ethylene chlorotrifluoroethylene) Halar 64% Self Extinguishing
Nomex N/A 28% Slow Burning
Nylon 6:6 N/A Ranges fron 24-29% Slow Burning to Self Extinguishing
PET (Polyethylene Terephthalate) Mylar (film), Dacron (fiber) Ranges from 21-34% Slow Burning to Self Extinguishing
Polyethylene (PE) N/A 17% Flammable
Polypropylene (PP) polythene (in the UK) 17% Flammable
Polytetrafluoroethylene (PTFE) Teflon 95% Self Extinguishing
Polyvinyl Chloride (PVC) N/A Ranges from 45-49% Self Extinguishing

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