Flex duct · Rooftop units · Refrigerant lines · Air handlers
HVAC & Duct Cable Ties
Long heavy-duty nylon, UV black, double locking and stainless steel ties built to handle large ducts, sun and vibration. Factory-direct bulk supply from US$5,000.
- Up to 1,530 mm nylon
- Up to 2,000 mm stainless
- UV black for outdoor units
- Duct size chart below
HVAC & Duct Cable Ties Built for Ductwork, Rooftops and Vibration
Up to 1,530 mm
Long nylon ties for large ducts
UV Black PA66
For rooftop & outdoor units
SS 304 / 316
Coastal & permanent installs
MOQ US$5,000
Factory-direct bulk supply
OVERVIEW
Are Your Duct Zip Ties Holding the Connection?
A flex duct that slips off its collar wastes conditioned air and fills the ceiling space with dust. Most of those failures come back to the tie: too short to wrap the duct properly, too weak to hold tension, or a standard indoor tie left in the sun on a rooftop unit.
At Shangbo we manufacture the cable ties HVAC installers and duct fabricators actually need: long heavy-duty nylon ties up to 1,530 mm, UV-stabilised black ties for outdoor units, double locking ties for vibrating equipment and 304/316 stainless steel ties for coastal and permanent installs.
Whether you are fixing flex duct to a takeoff collar, strapping an insulated jacket, tidying condenser wiring or anchoring refrigerant line sets, this page helps you pick the right HVAC zip ties by duct size, location and environment.
Factory-direct HVAC cable ties. Mix nylon, UV black, double locking and stainless ties in one order from US$5,000. Free samples are available on request — contact our team before placing your bulk order.
THE PROBLEM
Why Standard Zip Ties Fail on Ductwork
Hardware-store zip ties are made for short indoor cable bundles, not for ductwork. These are the three failures we see most on HVAC jobs:
X Too Short & Too Weak
A 6 in duct is 479 mm around. Standard 300 mm ties cannot reach, so installers chain them together and the joint becomes the weak point.
Duct work needs long, wide straps with real tensile strength.
X Sun & Attic Heat
Natural nylon is not UV stabilised and turns brittle on rooftops.
Hot attics and plant rooms push standard ties toward their limit, so grade matters.
X Vibration Loosening
Air handlers, fans and compressors vibrate constantly.
Over time a single-pawl tie can creep loose, so double locking or stainless ties are the safer choice near moving equipment.
OUR PRODUCTS
Choose Your HVAC Cable Tie
Shangbo supplies three main types of HVAC zip ties, each suited to a different part of the system. All are available for bulk orders, with free samples for qualified buyers.
Flex duct to collar, boots and takeoffs
- Material: Nylon 66, natural or UV black
- Widths: 7.6, 9.0 and 12.4 mm
- Lengths: up to 1,530 mm (fits ducts up to about 17 in)
- Tensile: 560 – 1,140 N
Best for: Flex duct connections, insulated duct jackets, indoor ductwork and plant rooms
Outdoor units and vibrating equipment
- UV black: PA66 with UV stabiliser, same sizes as standard nylon
- Double locking: 6 and 9 mm straps, 350 – 500 N
- Made for high-vibration equipment
- Indoor or outdoor use
Best for: Rooftop units, condenser wiring, refrigerant line sets, fans and compressors
Coastal, high-heat and large ducts
- Material: SS 201, 304 or 316 ball-lock
- Lengths: up to 2,000 mm
- Tensile: 1,000 – 3,115 N
- Coated versions available on request
Best for: Coastal buildings, hot roof spaces, permanent duct supports and ducts over 18 in
Shangbo HVAC cable ties come in natural, UV black and custom colours for large orders, so you can colour-code supply, return and refrigerant runs. Contact us with your requirements.
MOUNTING OPTIONS
Mounts & Double Locking Ties for Refrigerant Lines and Equipment
Ducts are tied; line sets, condensate pipes and control wiring also need fixing points. Pair your ties with a mount so runs stay neat along walls, ceilings and unit frames. See all cable tie mounts.
Screw & Adhesive Mounts
Fix a mount to a wall, ceiling or panel, then thread a standard tie through it. Used for line sets and control wiring.
Double Locking Ties
Two locking points hold tension on vibrating equipment such as fans, air handlers and compressors.
6 mm and 9 mm straps, 350 – 500 N.
Stainless Steel Ties
For permanent fixing to steel supports on rooftops and in plant rooms, or where heat or salt air rule out nylon.
MATERIAL GUIDE
Nylon vs. Stainless Steel for HVAC
Most HVAC jobs use nylon. The choice comes down to where the tie sits: inside the building, in the sun, or somewhere hot, salty or permanent.
Nylon 66 — Indoor Ductwork & Flex Duct
Nylon 66 is the standard choice for indoor duct work. It is light, quick to install and strong enough for flex duct connections in long heavy-duty sizes. The standard grade is cold-resistant to −25 °C.
UV Black PA66 — Rooftop Units & Outdoor Runs
Black PA66 with a UV stabiliser for condensers, rooftop units and any duct or line set in sunlight. Same sizes and strengths as standard nylon. See our UV-resistant cable ties.
Stainless Steel 304 / 316 — Coastal & Permanent Installs
Stainless steel does not rely on UV stabilisers and handles heat far better than nylon. SS 316 adds molybdenum for better resistance to salt air, so it suits coastal buildings and exposed rooftops.
Unsure whether to specify nylon, UV black or stainless? Our team can advise on the right tie for your project. Free samples are available on request — contact Shangbo before your next bulk order.
LOCATION GUIDE
Indoor, Attic or Rooftop: Which Grade to Choose
Match the tie to where it is installed. Indoor duct runs, hot attics and outdoor equipment each need a different grade.
Indoor & Plant Room — Standard PA66
For flex duct in ceilings, risers and plant rooms out of direct sunlight.
Standard nylon 66, natural or black.
Hot Attic — Heat-Stabilised PA66
For roof spaces that get very hot in summer. Ask for our heat-stabilised grade rated to 130 °C.
Rooftop & Coastal — UV Black or Stainless
In full sun use UV black nylon. Near the sea or for permanent fixing, use 304 or 316 stainless steel cable ties.
APPLICATIONS
Where HVAC & Duct Cable Ties Are Used
These are the main places installers use HVAC zip ties, and what to specify for each.
Flex Duct to Collar
Supply and return takeoffs, boots
Ductwork zip ties secure the inner core of flexible duct over the collar or boot. Use a long heavy-duty nylon tie sized to the duct diameter, tension it firmly, and trim the tail flush.
Insulated Duct Jackets
Outer jacket and vapour barrier
After the inner core is fixed, a second tie pulls the insulation jacket over the joint. The jacket is larger, so choose one size up from the core tie.
Outdoor Condensers & Rooftop Units
Wiring, line sets, condensate lines
Anything outdoors needs UV black ties at minimum. On the coast or for permanent rooftop fixing, use 316 stainless steel ties.
Refrigerant Line Sets
Suction and liquid lines, control cable
Bundle the line set with its control cable and fix it along walls with mounts. Avoid crushing the insulation: tension until snug, not tight.
Air Handlers & Fans
Vibrating equipment
Near fans, blowers and compressors, use double locking ties so vibration cannot work them loose over time.
Large Ducts & Plenum Boxes
Ducts over 18 in
Ducts larger than about 18 in exceed the longest nylon tie. Use long stainless steel ties. For plenum spaces, ask us first: our ties are not plenum-listed.
SELECTION GUIDE
Which Duct Zip Tie Do You Need?
Use this table to match the right tie to your HVAC job. The most common mistake is using standard natural nylon outdoors, where UV black or stainless is needed.
Your Situation
Nylon 66
UV Black PA66
SS 304 / 316
Flex duct to collar — indoor
✓ Ideal
✓ Works
⚠ Overkill
Insulated duct jacket
✓ Ideal
✓ Works
⚠ Overkill
Rooftop / outdoor ductwork
✗ Not UV rated
✓ Ideal
✓ Works
Outdoor AC condenser wiring
✗ Not UV rated
✓ Ideal
✓ Works
Refrigerant line sets
⚠ Indoor only
✓ Works
✓ Works
Hot attic / near heat
⚠ Check temp
⚠ Check temp
✓ Works
Fan / compressor vibration
⚠ Use double lock
⚠ Use double lock
✓ Works
Coastal / salt air
✗ Not rated
⚠ Check
✓ Ideal (316)
Fixing to wall / ceiling
✓ With mount
✓ With mount
✗ No mount
Duct over 18 in
✗ Too short
✗ Too short
✓ Ideal
Below −25 °C / above 85 °C
✗ Out of range
✗ Out of range
✓ Works
SIZE GUIDE
HVAC Cable Tie Size Reference
Start with the duct size chart, then check the heavy-duty nylon and stainless sizes below. All figures are from our catalogue. Contact our team for the full range.
Duct Size Chart — Which Tie Fits Your Duct:
| Duct size | Diameter (mm) | Circumference (mm) | Smallest tie that fits |
|---|---|---|---|
| 4 in | 102 | 319 | 7.6 × 380 mm nylon |
| 5 in | 127 | 399 | 7.6 × 450 mm nylon |
| 6 in | 152 | 479 | 7.6 × 530 mm nylon |
| 7 in | 178 | 559 | 7.6 × 610 mm nylon |
| 8 in | 203 | 638 | 7.6 × 760 mm nylon |
| 9 in | 229 | 718 | 9 × 820 mm nylon |
| 10 in | 254 | 798 | 9 × 920 mm nylon |
| 12 in | 305 | 958 | 9 × 1168 mm nylon |
| 14 in | 356 | 1117 | 9 × 1220 mm nylon |
| 16 in | 406 | 1277 | 9 × 1530 mm nylon |
| 18 in | 457 | 1436 | 16 × 2000 mm stainless |
| 20 in | 508 | 1596 | 16 × 2000 mm stainless |
Calculated from duct diameter against each tie’s catalogue maximum bundle diameter. Insulated flex duct is larger over the jacket: measure the outside and go one size up for the jacket tie. Above 450 mm the chart switches to stainless steel ties, which wrap any length.
Heavy-Duty Nylon — Key HVAC Sizes:
| Width × Length (mm) | Max Bundle (mm) | Tensile (N) | Tensile (lbs) | Grades |
|---|---|---|---|---|
| 7.6 × 370 | 98 | 560 | 130 | Natural · UV black |
| 7.6 × 500 | 150 | 560 | 130 | Natural · UV black |
| 7.6 × 760 | 225 | 560 | 130 | Natural · UV black |
| 9 × 920 | 280 | 778 | 175 | Natural · UV black |
| 9 × 1020 | 295 | 778 | 175 | Natural · UV black |
| 9 × 1168 | 340 | 778 | 175 | Natural · UV black |
| 9 × 1220 | 375 | 778 | 175 | Natural · UV black |
| 9 × 1350 | 400 | 778 | 175 | Natural · UV black |
| 9 × 1530 | 450 | 778 | 175 | Natural · UV black |
| 12.4 × 650 | 190 | 1140 | 250 | Natural · UV black |
| 12.4 × 920 | 280 | 1140 | 250 | Natural · UV black |
| 12.4 × 1020 | 295 | 1140 | 250 | Natural · UV black |
Stainless Steel Ball-Lock — Key HVAC Sizes:
| Width × Length (mm) | Tensile (N) | Tensile (lbs) | Grades |
|---|---|---|---|
| 4.6 × 520 | 1000 | 225 | 201 · 304 · 316 |
| 4.6 × 680 | 1000 | 225 | 201 · 304 · 316 |
| 4.6 × 800 | 1000 | 225 | 201 · 304 · 316 |
| 4.6 × 1000 | 1000 | 225 | 201 · 304 · 316 |
| 7.9 × 680 | 2220 | 500 | 201 · 304 · 316 |
| 7.9 × 1000 | 2220 | 500 | 201 · 304 · 316 |
| 12.7 × 1100 | 3115 | 700 | 201 · 304 · 316 |
| 16 × 1500 | 3115 | 700 | 201 · 304 · 316 |
| 16 × 2000 | 3115 | 700 | 201 · 304 · 316 |
Need a size not listed here? Send us your duct sizes and quantities and we will recommend the right ties. Minimum order value US$5,000. |
INSTALLATION
How to Zip-Tie Flex Duct in 5 Steps
Correct installation matters as much as the right tie. These five steps prevent most flex duct connection failures.
1
Pull the inner core over the collar
Slide the inner core at least 50 mm past the collar bead so the tie sits behind the bead and cannot slip off.
2
Seal before you tie
Apply the tape or mastic your project specifies to the core and collar first. The tie holds the joint; the seal stops air leakage.
3
Tension firmly with a tool
Pull the tie tight behind the bead. A cable tie tensioning tool gives even tension on every joint and avoids tired hands on big jobs.
4
Cut tails flush
Trim the tail flush to the head so it cannot tear the insulation jacket or cut hands during service.
5
Tie the jacket, then check
Pull the insulation and vapour barrier over the joint and fix it with a second, larger tie. Check every connection before closing the ceiling.
FAQ
Frequently Asked Questions
What size zip tie do I need for flex duct?
Pick a tie whose maximum bundle diameter is larger than the duct. A 6 in (152 mm) duct needs at least a 7.6 × 500 mm tie; a 10 in duct needs a 7.6 × 760 mm or 9 × 920 mm tie. Use the duct size chart on this page, and go one size up for the insulated jacket.
Are zip ties OK for securing flex duct, or do I need a clamp?
Long heavy-duty nylon ties are widely used to fix flex duct to collars and boots. Local codes and the duct maker may call for a specific tie strength, a tensioning tool or a metal clamp, so check the requirement for your project before you order.
What zip ties work best for outdoor AC units?
Use UV-stabilised black PA66 ties for condenser wiring and line sets in the sun. On the coast, or for permanent rooftop fixing, 316 stainless steel ties last longer.
Can zip ties handle attic heat?
Standard PA66 suits most attics. For hot roof spaces or near heat sources, ask for our heat-stabilised 130 °C grade or use stainless steel. See our heat resistant cable ties.
Nylon or stainless steel ties for ductwork?
Nylon is the usual choice for indoor flex duct: light, fast and low cost. Choose stainless steel for outdoor, coastal or high-heat duct runs, and for ducts larger than about 18 in.
Are your cable ties plenum rated?
No. Our cable ties are not plenum-listed. Please ask us before specifying them for plenum spaces. For plenum rated cable ties and fire-rated options, see our plenum rated cable ties page.
What's the MOQ for bulk HVAC cable ties?
The minimum order value is US$5,000. You can mix nylon, UV black, double locking and stainless ties in one order. Send sizes, quantities and packing for a bulk quote.
BULK SUPPLY
Supplying HVAC Contractors & Duct Fabricators
We manufacture cable ties in our own factory and supply them in bulk to HVAC contractors, duct fabricators and building-supply distributors. Mix duct ties, UV black, double locking and stainless ties in one order.
Documentation & Certificates
Material datasheets and test reports are available on request.
Please check our certificates page to confirm which certificates apply to your selected products.
Sizes & Colours
All standard sizes are in production. Custom lengths and widths can be made on demand.
Custom colours are available for large orders.
MOQ & Quotation
Minimum order: $5,000 per order.
Send us the product type, size, colour, quantity, packaging and destination country, and we will reply with a bulk quote and free samples.
WHY CHOOSE US
Why Source Your HVAC Cable Ties from Shangbo?
Anhui Shangbo Plastic Co., Ltd. manufactures nylon cable ties and stainless steel cable ties for industrial buyers worldwide. With more than 15 injection moulding machines and nearly 100 cable tie mould tools, we produce over 100 standard sizes, including the long heavy-duty lengths duct work needs.
Our cable ties are exported to professional buyers in the USA, Malaysia, Indonesia, Philippines, Brazil, Russia, Saudi Arabia and India.
Long Heavy-Duty Nylon
Nylon 66 ties up to 1,530 mm long and 1,140 N for flex duct and large duct connections. Natural or UV black.
SS 304 & 316 On Demand
Stainless steel ties up to 2,000 mm for coastal, hot and permanent HVAC installs. Coated versions on request.
100+ Sizes — Custom Colours
Over 100 standard sizes for bulk orders. Custom colours available for large orders. Custom dimensions available with tooling — contact for lead time.
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