Nice product at great price
Was wiring my car and had quite a few smaller wires to crimp and cover. This worked great — shrinks clean and consistent every time.
Church's · Verified Purchase★ Verified
2:1 Single Wall · UL 224 Recognized
3/4"
2:1 Heat Shrink
Fits3/0–4/0 AWG19.1mm
3/4 inch heat shrink tubing fits 3/0 and 4/0 AWG wire — used for cable bundle strain relief, wire harness bundling at panel entry points, large battery bank main cables, and shore power cord strain relief. ABYC E-11 Table XI rates 3/0 AWG at 175A and 4/0 AWG at 200A; conductors at these ratings are typically the main feed cables for large inverters, shore power inlets, and high-current LiFePO4 battery systems. At 19.1mm expanded diameter, this tube slides freely over 3/0 and 4/0 AWG conductors and bundles and recovers to approximately 9.55mm. The 2:1 single-wall construction, qualified to UL 224, is suited for strain relief and mechanical bundling in dry enclosures and conduit entries where protecting the cable jacket is the objective. When the application requires weather resistance at outdoor cable penetrations, the 3:1 dual-wall provides adhesive-backed sealing around large conductors. The 90ft roll supplies enough material for an electrical contractor to outfit a complete panel installation with consistent cable entry protection across every conduit penetration.
★★★★★4.7 · 225 verified ratings across the Helixal range
49 in stock · Ships in 24h
Order up to 49 online · need more? Trade pricing
Size3/4" · 19.1mm
Click any size to navigate · 90 ft per roll
$29.3990 ft spool
→ Dispatched within 24 hours — delivered in 1–3 days→ 30-day money-back guarantee — 30 days to return it
Qty
1
Secured by Stripe · No account needed
→Ships USA & Canada
→ISO 9001
→Ships 24h
SKU: B0FJHLG73V · 3/4" (19.1mm) · 90 ft
Spec Sheet
3/4"
data sheet.
High-volume UL 224 Recognized polyolefin at an honest per-foot cost. The industry standard for band marking, bundling, and dry indoor electrical insulation.
Imperial Size
3/4"
Expanded diameter
Metric Size
19.1mm
Nominal
Roll Length
90 ft
Per spool
Wire Gauge
3/0–4/0 AWG
Bare conductor
Shrink Ratio
2:1
Single wall
Construction
Single Wall
No adhesive liner
Adhesive Liner
None
Not waterproof
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
Material
Polyolefin
UL 224 Recognized
Certification
UL 224
Recognized Component
Flammability
Self-extinguishing
UL 224 Recognized
Color
Black
Standard finish
Moisture
Resistant — not sealed
Single wall only
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.
Perfect for bulk workshop use
Bought this for my automotive workshop and the 120ft roll is exactly what I needed. Shrinks consistently and cleanly every time. Much better value than small packs.
Mike R. · Verified Purchase★ Verified
Professional finish every time
Clean black finish, no bubbles or wrinkles when applied correctly. UL listing is important for commercial electrical work — ticks that box too.
James T. · Verified Purchase★ Verified
Customer Reviews
Loading reviews…
Sizing & Application — 3/4 inch, 90ft roll
Strain relief at a panel entry is a mechanical part, and this is the size of it.
3/4 inch (19.1mm) recovers to about 9.6mm. It clears bare 3/0–4/0 AWG cable — rated by ABYC E-11 Table XI at 175A and 200A — and, more often, the lug crimped onto 2 AWG where barrel and palm together exceed 15mm. Most of its working life is spent doing something that has nothing to do with insulation: holding a cable still where it enters something rigid.
Why cables fail at the entry and not in the middle
A cable entering a panel, gland or conduit passes from something that can move to something that cannot. All the bending that the run absorbs over metres has to be accommodated in the few centimetres either side of that boundary. Vibration, thermal cycling and every service visit concentrate there.
Unrelieved, the jacket eventually splits at the edge of the fitting and the conductors underneath work-harden and break. On heavy cable the failure is slow and unspectacular — a chafe mark, then exposed shield or strands, then a fault that is diagnosed as something else because the visible damage is inside a gland.
A shrunk sleeve spanning the boundary spreads that bending over its own length and adds a wear surface at the edge of the fitting. Aim for at least 40mm of overlap on the cable side so the transition is gradual rather than moving the stress concentration to the end of the tube. Heat from the fitting outward so air escapes at the open end.
3/4 inch on the 90ft roll
| Property | Figure | Why it matters |
|---|---|---|
| Expanded diameter | 19.1mm (3/4") | Clears a 2 AWG lug and bare 3/0–4/0 cable |
| Recovered diameter | ≈9.6mm | Grips the jacket behind a fitting or lug |
| Bare cable range | 3/0–4/0 AWG | 175A for 3/0, 200A for 4/0 (ABYC E-11 Table XI) |
| Overlap for strain relief | ≥40mm on the cable side | Spreads bending instead of relocating the stress point |
| Heating | From the fitting outward, rotating | Air escapes at the open end; avoids a wrinkled shoulder |
| Roll length | 90 ft | Enough cable entries to outfit a full panel installation |
At this diameter a static heat gun scorches the outer wall before the far side has moved. Keep it moving and rotate the assembly.
When to choose differently
01 · The entry must exclude water
Strain relief and sealing are different jobs. An outdoor or below-deck penetration needs the 3/4" 3:1 Dual Wall, whose liner bonds to the jacket and the fitting.
02 · The assembly has a moulded boot
A finished shore power assembly can exceed a 19.1mm bore. Measure the assembly at its widest and step to 1 inch if it is close.
03 · The jacket is under 10mm
A 9.6mm recovered wall will not grip it, and a loose sleeve gives no strain relief at all. Step down to 5/8 inch.
04 · Above 600V
Rated 600V rms. Heavy-wall cable splice tubing is a different product class and is commonly marketed at 1000V — do not read a flexible tubing rating as a splice-kit rating.
Keep reading →3/4" 3:1 Dual Wall — for sealed penetrations · Automotive Wire Protection Guide · 2:1 Heat Shrink Tubing Uses
How it shrinks.
01
Measure & Select
Choose a size where the expanded diameter is 20–30% larger than your wire or bundle. Smaller tubes will slide on easier; slightly oversize is better than too tight.
02
Cut & Thread
Cut to length and thread onto the wire before making the splice. The tubing cannot pass over a crimped terminal — position it first, then complete the connection.
03
Apply Heat
The tubing starts shrinking at 100°C — use a heat gun and keep it moving until it has shrunk evenly along its length. Work from the center outward. Avoid open flame — it scorches the tubing and creates uneven shrink.
04
Inspect
Finished tubing should be tight with no bubbles or lifted edges. No adhesive will appear at the ends — this is single-wall tubing. Confirm even recovery across the full length.
Watch
All Videos →See 3/4" In Use
Size ReferenceExpanded vs.
Expanded vs.
recovered.
Actual 3/4" tube at full expanded diameter (19.1mm) and after heat recovery. Use this as your fit reference before cutting.
Expanded: 19.1mm — slides over 3/0–4/0 AWG
Shrink ratio: 2:1 on full heat
Use it on.
01
Cable Bundle Organization
Consolidates large wire bundles in audio systems, industrial panels, and equipment racks — providing clean mechanical protection and band identification.
02
Wire Termination Insulation
Insulates large wire terminations in dry indoor environments such as panel boards, UPS systems, and large inverter installations.
03
Audio & AV Cable Management
Used on subwoofer feeds, amplifier power wiring, and AV distribution cables in home theater and commercial audio installations.
04
Industrial Panel Harnesses
Provides strain relief and band identification for large wire harnesses at the entry and exit points of industrial control panels.
05
UPS & Battery Backup Wiring
Covers large battery cable connections and bus bar leads on UPS systems and battery backup installations in data centers and facilities.
06
Conduit Entry Finishing
Provides a clean protective sleeve at conduit entry and exit points where cables transition between raceways and panels indoors.
Size Guide
3/4" Questions.
Technical Guides
All Guides →From the Blog
Free Tool
Heat Shrink Size Calculator
Read Guide →Ratios2:1 vs 3:1 vs 4:1 Heat Shrink Ratio Guide
Read Guide →Uses2:1 Heat Shrink Uses — Bundling & More
Read Guide →SizingSize Chart & Selection Guide
Read Guide →ComparisonHeat Shrink vs Electrical Tape
Read Guide →Buyer's GuideBest Heat Shrink Tubing 2026
Read Guide →Also available — 3/4" in other lines
All 13 sizes.
View line overview →3/32"2.4mm120 ft1/8"3.2mm120 ft3/16"4.8mm120 ft1/4"6.4mm120 ft5/16"8mm120 ft3/8"9.5mm120 ft1/2"12.7mm120 ft5/8"16mm90 ft
Current3/4"19.1mm90 ft
1"25.4mm90 ft1-1/4"31mm60 ft1-1/2"38mm60 ft2"50.8mm60 ftRecovered diameter is approx. 1/2 of the expanded size shown · All sizes ship to USA & Canada