Shop By Category

Lifting Slings
Polyester Round Slings

Polyester Round Slings

Polyester Round Sling Rigging

A polyester round sling is a versatile, convenient, and cost-effective way to lift a variety of cargo. Manufactured in the USA from a continuous loop of polyester yarn, round slings are covered with a durable polyester fabric that is color-coded by capacity.

These slings are lightweight, making them easy to use and store, and they offer superior strength without the hassle of working with wire rope or chain.

Features of Polyester Round Lifting Slings

Why choose a polyester round sling over all the other sling options we carry? It's important to look at both the advantages and disadvantages to make sure it's the right sling for your application.


The flexible, pliable design of a round sling allows it to adjust to the contours and hug a load better than other types of lifting slings.

Stretch Capacity

The round sling polyester fabric has less stretch than a nylon lifting sling, which prevents the sling from locking up on the load when used in a choker hitch.


Polyester offers exceptional resistance to mildew and rot since it won't absorb water. Because the jacket completely surrounds the sling, it keeps dirt, grease, oil, abrasions, and UV degradation from compromising the load-bearing core. The jacket also offers protection to the load from scratches, marring, etc.

They are more susceptible to damage than wire rope or chain slings, but are most more cost-effective.

Color-Coded Jacket

Round slings are manufactured with a colored fabric jacket based on the weight capacities of the sling. This makes it easy to recognize the weight ratings at a glance. Each sling also has identification tags to indicate size, type, and capacity.

Chemical Resistances

Polyester round slings are not affected by bleaching agents or common acids. They can be damaged by sulfuric acids or alkaline, however.

Temperature Range

These slings should not be used in temperatures over 194 degrees Fahrenheit (90 degrees Celsius).

Types of Polyester Round Slings

Endless round slings and eye & eye round slings are extremely similar, with identical rated capacities, the compatibility with all sling types, and the same standard color coded jacket system.


A round sling in an endless design is simply one large "endless" loop. A benefit of an endless round sling design is that the wear points can be adjusted with each use, to extend the working life of the sling.

Eye & Eye

Eye & eye lift slings are created by attaching a wear pad to both sides of the sling to create loop eyes on each end.

How to Measure

A polyester round sling is measured from sling tip to tip when laid in a flat position. It should not be measured by circumference.

how to measure a polyester roundsling

It's also important to note that the round sling diameter refers to the thickness of the core polyester rope, not the fabric jacket cover.

diameter of a polyester round sling

Polyester Round Sling Protection

"Slings in contact with edges, corners, protrusions, or abrasive surfaces shall be protected with a material of sufficient strength, thickness, and construction to prevent damage." - ASME B30.9 (2021) 9-5.10.4(d)

Make sure your lifting setup meets the necessary requirements - explore our selection of sling protection, including a cut-resistant option! If you aren't sure what you're looking for, we have several charts that break down which sling protection sizes work with each polyester round sling type.

Custom Round Slings

If you don't see the size you're looking for, let us know. Custom lifting slings are always an option at US Cargo Control. 

Sling Proof Testing Certificates

Proof testing certificates are available for a nominal fee and must be requested at the time of ordering. Testing is performed in the factory where the polyester round sling is pull tested to 2x the vertical rating and officially recorded as proof for governing bodies.

Since only random slings are tested during production, a request must be made prior to manufacturing.

We're Here to Help

Have questions? Give our sales team a call today. One of our team members will be happy to help - we can even place your polyester round sling order for you.

Other styles of slings are also available, including plasmachainnylon, and high performance roundslings.