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
5/8"
2:1 Heat Shrink
Fits1/0–2/0 AWG16mm
5/8 inch heat shrink tubing fits 1/0 and 2/0 AWG wire — the gauge used for large cable bundles, audio amplifier main power feeds, RV shore power connections, and LiFePO4 battery bank main cables. ABYC E-11 Table XI rates 1/0 AWG at 125A and 2/0 AWG at 150A in a standard marine installation; cables at these current levels are typically the highest-value conductors in a vehicle or vessel and require durable insulation protection at every termination. At 16mm expanded diameter, this tube slides freely over 1/0 and 2/0 AWG conductors and recovers to approximately 8.0mm. The 2:1 single-wall construction, qualified to UL 224, is the right choice for large cable organization and identification in dry bays and enclosures where bundling and mechanical protection are the main goal. For shore power connections and any cable exposed to weather or bilge moisture, the 3:1 dual-wall adhesive version provides the watertight protection this cable size demands. The 90ft roll is a practical bulk quantity for audio installers, RV technicians, and marine fabricators completing full builds.
★★★★★4.7 · 225 verified ratings across the Helixal range
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Size5/8" · 16mm
Click any size to navigate · 90 ft per roll
$25.9990 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: B0FJH4BN1Y · 5/8" (16mm) · 90 ft
Spec Sheet
5/8"
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
5/8"
Expanded diameter
Metric Size
16mm
Nominal
Roll Length
90 ft
Per spool
Wire Gauge
1/0–2/0 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
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Sizing & Application — 5/8 inch, 90ft roll
Measure the palm, not the barrel. On a lug they are not the same number.
5/8 inch (16mm) recovers to about 8mm. It clears bare 1/0–2/0 AWG battery cable and the crimped lug barrels used on 4–2 AWG. ABYC E-11 Table XI rates 1/0 AWG at 125A and 2/0 AWG at 150A — inverter feeds, bank interconnects, amplifier mains. At this scale the sizing input people reach for is almost always the wrong dimension on the part in front of them.
Three diameters on one termination, and which one governs
A crimped lug presents at least three distinct diameters. There is the cable jacket behind it, the barrel that the conductor is crimped into, and the palm — the flattened ring end that takes the bolt. They are rarely close together, and on a 2 AWG lug the palm can be half again the width of the barrel.
The tube has to pass over all three cold if it is going to end up behind the lug, so the largest of them governs the size. That is the palm in most catalogue lugs, and it is the dimension people skip because a caliper naturally lands on the round barrel rather than the flat.
Then check the other end of the range. The recovered diameter is about 8mm here, and the tube has to close onto the cable jacket to be doing anything at all. If the jacket is thinner than 8mm, a 2:1 tube at this size will reach its programmed diameter and stop, sitting loose on the cable — technically covered, functionally a sleeve.
5/8 inch on the 90ft roll
| Property | Figure | Why it matters |
|---|---|---|
| Expanded diameter | 16mm (5/8") | Must clear the lug palm, not just the barrel |
| Recovered diameter | ≈8mm | Will not grip a jacket thinner than about 8mm |
| Bare cable range | 1/0–2/0 AWG | 125A for 1/0, 150A for 2/0 (ABYC E-11 Table XI) |
| Governing dimension | The widest of jacket, barrel and palm | Usually the palm on a catalogue ring lug |
| Wall type | Single-wall polyolefin | Bundling, identification and abrasion in dry bays |
| Roll length | 90 ft | A four-battery bank uses a few feet; this is multi-build stock |
Allow about 20% clearance over the governing dimension. A tube forced over a palm arrives pre-stretched and finishes looser than its rated recovery.
When to use a different product
01 · The bank is in a bilge or engine bay
Corrosion on a battery bank starts at the lug shoulder, and a 2:1 tube tents across that step rather than following it. The 5/8" 3:1 Dual Wall recovers further and fills the gap with adhesive.
02 · The palm is over about 13mm
Clearance is gone by then. Move to 3/4 inch, which has a 19.1mm bore and recovers to roughly 9.6mm.
03 · The jacket is thin
Below about 8mm the recovered wall will not close onto it. Either step down a size or accept the tube as a sleeve rather than a fitted cover.
04 · Above 600V
We hold 600V rms. On 1000 Vdc battery and EV charging runs the conductor must already be rated, and tubing is a cover over it.
Keep reading →5/8" 3:1 Dual Wall — seals the lug shoulder · 3/4" 2:1 — for larger lug palms · Waterproof Electrical Connectors Guide
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 5/8" In Use
Size ReferenceExpanded vs.
Expanded vs.
recovered.
Actual 5/8" tube at full expanded diameter (16mm) and after heat recovery. Use this as your fit reference before cutting.
Expanded: 16mm — slides over 1/0–2/0 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
5/8" 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 — 5/8" 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 ft
Current5/8"16mm90 ft
3/4"19.1mm90 ft1"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