What size wire does 3/32 inch heat shrink fit?

Helixal 3/32" (2.4mm) 3:1 short roll heat shrink fits bare 20–22 AWG wire — thermocouple leads, LED strip wiring, PCB hook-up wire, and instrument sensor cable. It slides on freely at 2.4mm expanded and recovers to roughly 0.8mm, gripping fine strands without crushing them.

Is 3/32 inch heat shrink big enough for a butt splice?

No. A crimped 22–18 AWG butt splice barrel measures 5–6mm across, which is wider than the 2.4mm expanded bore of 3/32" tubing. Size heat shrink to the widest point it must pass over, not to the wire: use 1/4" over the splice itself and 3/32" on the bare conductor either side.

Is 3/32 inch dual wall heat shrink waterproof?

Yes. The hot-melt adhesive inner liner flows at 120°C and forms a 360° watertight seal around the conductor. On fine-gauge wire this matters more than most people expect — single-wall tubing lets condensation wick along the strands by capillary action, while the adhesive liner blocks that path.

How much tubing is in a 3/32 inch short roll?

Each Helixal 3/32" short roll holds 10 feet (about 3 metres) of 3:1 dual-wall adhesive-lined tubing — enough to rewire a full instrument panel or sleeve several dozen soldered joints, without buying a 60ft bulk spool of a fine size you use sparingly.

Is the 600V rating AC or DC?

AC. Heat shrink tubing is rated under UL 224, which expresses voltage in volts rms — so our 600V tubing is rated 600 V rms, and we hold no rating above it. The UL 224 standard ratings are 150V, 300V and 600V; since Edition 8, published February 2026, an optional higher voltage rating is also available, which our tubing does not carry. On any circuit above 600V — a 1000 Vdc solar string, for example — the conductor itself must carry the insulation rating, UL 4703 PV wire or RHW-2/USE-2, both rated 2000V, with heat shrink used as a sealing cover over those already-rated components rather than as the primary insulation.

Can I use this 3/32" pack on a 1000V solar array?

Yes — as a seal, not as insulation. This 3/32" (2.4mm) tubing is rated 600 V rms, and we hold no rating above it, so it is not the insulation of record on a 1000 Vdc string: the conductor carries that rating, UL 4703 PV wire or RHW-2/USE-2, both rated 2000V. The 10ft pack is sized for resealing a single 20–22 AWG termination without opening a 60ft spool, and the voltage class is identical to the large rolls. If a supplier offers you 1000V rated tubing, ask which standard, edition and file number backs the number.

3:1 · 3/32" · 10 ft● LIVE SPEC

10ft Short PackAdhesive Liner600V Rated HELIXAL 3:1 Dual Wall Heat Shrink Tubing 3/32" (2.4mm) — 10ft Short Pack

BLACK · 3/32" · 10 FTHELIXAL · ISO 9001

3:1 Dual Wall · 10ft Short Pack

3/32"
3:1 Heat Shrink

Fits20–22 AWG2.4mm

3/32 inch heat shrink tubing fits 20–22 AWG wire — thermocouple leads, LED strip runs, PCB hook-up wire, and the sensor cable on e-bike controllers and marine instrument panels. NFPA 70 Table 310.15 rates 22 AWG at 3A and 20 AWG at 5A, so at this gauge the quality of the seal matters far more than conductor sizing. At 2.4mm expanded, the tube slides over bare 20 and 22 AWG conductors and recovers to roughly 0.8mm — enough grip to hold a soldered joint without crushing fine strands. Size to the widest point you must cover, not the copper: a crimped 22–18 AWG butt splice barrel measures 5–6mm and needs 1/4 inch, so keep 3/32 inch for the bare conductor either side of it. The hot-melt liner flows at 120°C and seals the joint against condensation. Ten feet rewires a full instrument panel without paying for a 60ft spool.

★★★★★4.7 · 225 verified ratings across the Helixal range

22 in stock · Ships in 24h

Order up to 22 online · need more? Trade pricing

Size3/32" · 2.4mm

3/32"1/8"3/16"1/4"5/16"3/8"1/2"5/8"3/4"1"1-1/4"1-1/2"2"

Click any size to navigate · 10 ft per roll

$9.3910 ft spool

→ Dispatched within 24 hours — delivered in 1–3 days→ 30-day money-back guarantee — 30 days to return it

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SKU: B0FJN39259 · 3/32" (2.4mm) · 10 ft

Spec Sheet

3/32"
data sheet.

Full industrial dual-wall adhesive spec in a convenient 10ft pack. Same 600V rated, waterproof polyolefin construction as the large bulk rolls.

Imperial Size

3/32"

Expanded diameter

Metric Size

2.4mm

Nominal

Roll Length

10 ft

Per spool

Wire Gauge

20–22 AWG

Bare conductor

Shrink Ratio

3:1

Dual wall

Construction

Dual Wall

Adhesive inner liner

Inner Layer

Hot Melt Adhesive

Waterproof seal

Voltage Rating

600V AC

UL 224 — 600 V rms

Temp Rating

-55°C to +125°C

Continuous service

Shrink Temp

100°C (212°F)

Shrinking starts

Adhesive Flow

120°C (248°F)

Keep heating until it shows

Material

Polyolefin

Outer sleeve

Flammability

Self-extinguishing

UL 224 Recognized

Color

Black

Standard finish

Standards

UL 224 Recognized

UL file E361230 · RoHS

UV Resistance

Yes

Outdoor safe

Waterproof

Yes — adhesive seal

360° coverage

Sizing over a connector? The Wire Gauge row above is for bare conductor. Heat shrink must be sized to the widest point it passes over, so a crimped butt splice or lug barrel needs a larger tube than the wire alone — a 22–18 AWG splice barrel measures 5–6mm, a 16–14 AWG barrel 7–8mm, and a 12–10 AWG barrel 9–11mm. Measure the barrel, allow about 20% clearance, and confirm the recovered diameter is smaller than the narrowest thing the tube must grip. Use the size calculator.

What the
trade says.

Verified Buyers ★ · Full Range4.7★★★★★225 ratings · 84% 5-starCombined verified-buyer rating for every Helixal product — all ratios, all sizes — not this size alone.

★★★★★

Better than electrical tape by far!

Used this on vehicles (starters) and trailer lights. Easy to use, looks like a professional fitting, and seems to hold tight.

Verified Buyer · Verified Purchase★ Verified

★★★★★

Good quality and sealing heat shrink

Heat shrink works good. Makes a nice sealed wire connection. Better than pre-cut heat shrink — you can make whatever length you want.

R Davis · Verified Purchase★ Verified

★★★★★

Smart format for repair work

Great for keeping several sizes on hand without the bulk. Same quality as the large rolls — the adhesive seals perfectly every time.

Travis M. · Verified Purchase★ Verified

Customer Reviews

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Sizing & Application — 3/32 inch, 10ft pack

At this gauge ten feet is not a small quantity. It is about sixty repairs.

3/32 inch (2.4mm) fits bare 20–22 AWG — thermocouple leads, LED strip runs, PCB hook-up wire, instrument sensor cable. Fine-gauge work consumes tubing in inches, not feet, so the arithmetic of a short pack inverts at the bottom of the range. Ten feet cut into the 2-inch pieces this work actually uses is roughly sixty terminations, which for most people is a year of them.

Why the smallest sizes are the worst ones to buy in bulk

Consumption per joint scales with diameter. A 2 AWG lug end takes 4 inches of tube; a soldered thermocouple splice takes an inch and a half. Buy both sizes on 60ft rolls and the large one is gone in a season while the small one is still three-quarters full years later.

That imbalance is the reason this pack exists at the fine end of the line. The 60ft roll of 3/32 inch is genuinely production stock — correct for a shop terminating instrument wire daily, and a poor purchase for anyone else, because most of it will be sitting on the shelf long after the job that prompted it.

Ten feet, meanwhile, rewires a complete instrument panel with tubing left over. It is enough to sleeve every soldered joint on a sensor loom, colour the break-outs, and still have material for the next fault. The pack is sized to the work rather than to a price break, which at this diameter turn out to be different numbers.

3/32 inch short pack at a glance

Property	Figure	Why it matters
Expanded diameter	2.4mm (3/32")	Slides over bare 20 and 22 AWG without forcing
Recovered diameter	≈0.8mm	Grips fine strands without crushing them
Bare wire range	20–22 AWG	3A for 22 AWG, 5A for 20 AWG (NFPA 70 Table 310.15)
Pack yield	≈60 pieces at 2 in	A full instrument panel, with material to spare
Wall type	3:1 dual wall, hot-melt lined	Liner flows at 120°C and blocks moisture wicking down the strands
Bulk equivalent	60 ft roll	Production stock — six times this pack

Fine tubing reaches recovery temperature quickly. Work from a greater distance and keep the gun moving, or the polyolefin scorches before the liner flows.

When to reach for a different size or format

01 · There is a crimp barrel

A 22–18 AWG insulated butt splice measures 5–6mm and will not enter a 2.4mm bore. Use the 1/4 inch pack over the splice and keep 3/32 inch for the bare conductor either side.

02 · You terminate this gauge daily

At that rate the 60ft roll is the cheaper way to hold the size. The short pack is for people who need 3/32 inch occasionally and correctly.

03 · The joint stays dry indoors

Inside a sealed enclosure there is nothing for the adhesive to exclude, and the 3/32" 2:1 gives the same insulation and strain relief for less.

04 · Above 600V

Our rating is 600V rms. On a 1000 Vdc string the conductor must already be rated for the circuit, and tubing seals rather than insulates.

Keep reading →3/32" 3:1 Dual Wall — 60ft bulk roll · Solder and Heat Shrink · Heat Shrink Tubing Size Chart & Selection Guide

How it shrinks.

Measure & Select

Verify the expanded diameter is 20–30% larger than your wire or connector. The tubing must slide freely before heat is applied — if it drags, go one size up.

Cut & Thread

Cut to length and thread onto the wire or cable before making the splice or crimp. Overlap each terminal or connector end by at least 10mm for a proper seal.

Apply Heat

The tubing starts shrinking at 100°C, but the adhesive liner only flows at 120°C — so keep the heat gun moving past the point where it looks shrunk. Start at the center and work outward to push air toward the ends. Adhesive will appear at the tube ends — that is your visual seal indicator.

Inspect

The tubing should be tight and uniform with adhesive visible at both ends. No gaps, lifting, or cold spots. Pull-test the finished connection to confirm the adhesive bond.

✓

Watch

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Size Reference

Expanded vs.
recovered.

Actual 3/32" tube at full expanded diameter (2.4mm) and after heat recovery. Use this as your fit reference before cutting.

Expanded: 2.4mm — slides over 20–22 AWG

Shrink ratio: 3:1 on full heat

3/32" 3:1 heat shrink tubing — expanded diameter 2.4mm versus recovered size reference diagram

3/32" · 2.4mm expanded3:1 recovery · fits 20–22 AWG

Use it on.

Try Before You Buy Bulk

Order a 10ft pack to verify the size fits your connector before committing to a large roll. Test fit, shrink one piece, then buy the bulk roll with confidence.

Field Repair Kits

Keep a set of short rolls on the service van or boat. Enough for any repair job without hauling large rolls — one 10ft roll handles most splices.

Stock Multiple Sizes Cheap

For the same cost as one large roll, stock several different sizes in short packs. Covers more connector diameters for the same investment.

Marine & Outdoor Spot Repairs

Seals individual connections on boat wiring, outdoor electrical, and trailer harnesses. Same waterproof adhesive seal as the large rolls — just 10ft.

Low-Volume Production

Ideal for small-batch cable assembly and prototype builds where a full bulk roll would sit unused. Cost-effective for runs of fewer than 50 connections.

One-Off Automotive Builds

Custom automotive and motorcycle builds often need several sizes in small quantities. Short rolls let you match every connection without leftover material.

Size Guide

3/32" Questions.

Technical Guides

From the Blog

All Guides →

Free Tool

3/32" 3:1 Large Roll →Bulk 20–60ft roll

All 13 sizes.

View line overview →

Current3/32"2.4mm10 ft

1/8"3.2mm10 ft 3/16"4.8mm10 ft 1/4"6.4mm10 ft 5/16"8mm10 ft 3/8"9.5mm10 ft 1/2"12.7mm10 ft 5/8"16mm10 ft 3/4"19.1mm10 ft 1"25.4mm10 ft 1-1/4"31mm10 ft 1-1/2"38mm10 ft 2"50.8mm10 ft

Recovered diameter is approx. 1/3 of the expanded size shown · All sizes ship to USA & Canada

3/32"
3:1 Heat Shrink

3/32"
data sheet.

What the
trade says.

At this gauge ten feet is not a small quantity. It is about sixty repairs.