The Round Sling Experts
Round slings cradle a load in a soft, endless body that flexes to grip irregular shapes without marring finished surfaces. SlingCenter carries Liftex® RoundUp® color-coded polyester round slings and, for the toughest and most weight-critical jobs, Extreema® high-performance HMPE (Dyneema®) round slings — plus coil, stage, cut-resistant, and heat-resistant versions, and the hardware to rig them. Lift to the rated capacity printed on each sling’s tag and product page.
How a round sling is built
A continuous bundle of load-bearing yarn — polyester, or HMPE/Dyneema® in Extreema — forms the core; a woven cover protects that core and carries no load itself. Because the load is shared across thousands of parallel yarns, round slings are exceptionally strong for their weight, conform to the load, and grip well in a choker. Polyester cores stretch only about 3–5% at rated capacity — less than nylon — so the load stays controlled.
The round sling color code
Polyester round slings follow an industry color code so crews can identify a capacity class at a glance, in a consistent order from lighter to heavier ratings:
| Color | Capacity class |
|---|---|
| Purple | Lightest standard class |
| Green | ↑ heavier |
| Yellow | ↑ heavier |
| Tan | ↑ heavier |
| Red | ↑ heavier |
| White | ↑ heavier |
| Blue | ↑ heavier |
| Orange | Heaviest standard class (and up) |
Color indicates the capacity class, not a guaranteed number. Exact ratings vary by manufacturer and by hitch, so always confirm the WLL on the tag and product page rather than by color alone. Each SlingCenter round sling lists its rated capacity for vertical, choker, and basket hitches.
SuperTechlon® — our top-performing round sling
Want more capacity in the same footprint? Choose Liftex® SuperTechlon®. It outperforms a standard polyester roundsling where it counts:
- Higher capacity than the industry standard. SuperTechlon is rated above the standard color-code capacity for the same color — a purple SuperTechlon is rated 3,000 lb vertical versus the ~2,600 lb industry standard, and the advantage holds across every color.
- Line-rated cover — read the capacity at a glance. Each line woven into the cover represents 3,000 lb of vertical capacity, so you can confirm the capacity class just by counting lines.
- Vertical capacity printed on the cover. The rated WLL is right on the sling, so crews can verify it in the field without hunting for the tag.
- Tough outer cover for extra abrasion resistance and a longer service life.
| Color | Reference | Lines on cover | Vertical WLL |
|---|---|---|---|
| Purple | ST-ENR-3K | 1 | 3,000 lb |
| Green | ST-ENR-6K | 2 | 6,000 lb |
| Yellow | ST-ENR-9K | 3 | 9,000 lb |
| Tan | ST-ENR-12K | 4 | 12,000 lb |
| Red | ST-ENR-15K | 5 | 15,000 lb |
| White | ST-ENR-18K | 6 | 18,000 lb |
| Blue | ST-ENR-24K | 8 | 24,000 lb |
| Orange | ST-ENR-30K | 10 | 30,000 lb |
Vertical rated capacity at a 5:1 design factor; each line on the cover = 3,000 lb. Choker and basket ratings are on each product page. See all SuperTechlon sizes →
When to choose a round sling
- Delicate or coated loads — the soft cover and wide bearing surface protect finishes.
- Choker lifts — round slings cinch and grip well; the endless design lets you rotate wear points.
- Weight-critical rigging — huge strength-to-weight, especially with Extreema HMPE, which even floats on water.
Our round sling families
- Liftex RoundUp® (endless, color-coded): the everyday polyester round sling. Shop endless →
- Eye & eye round slings: finished eyes instead of an endless loop. Shop eye & eye →
- Extreema® XS (HMPE / Dyneema®): the smallest, strongest, lightest roundsling in the industry. Shop XS →
- Coil-handling slings for the tight grip and edge exposure of coil and reel lifts. Shop coil slings →
- Heat- & cut-resistant: Extreema Inferno® for high heat and cut-protection cores for sharp edges. Heat resistant · Cut resistant
- Stage / entertainment rigging: rated slings for overhead production work. Shop stage slings →
Round sling vs. web sling — which one?
Reach for a round sling when you want maximum flexibility, a soft wide bearing surface, a strong choker grip, or the lightest possible sling (Extreema). Reach for a web sling when you want a flat, stable bearing surface that won’t roll on the load, or a specific eye orientation. Many riggers carry both — see our web slings.
Choosing the right round sling
- Load weight & hitch (vertical / choker / basket) — apply the hitch factor on the tag.
- Capacity class — pick by rated WLL (confirmed on the tag), using color only as a first cue.
- Length — measure loop-to-loop; longer slings ease the angle load in bridle lifts.
- Environment — heat, chemicals, or sharp edges push you toward Extreema Inferno, HMPE, or added protection.
- Protection — the cover guards the core, but a sharp edge still needs a wear pad or sleeve.
Care & maintenance
- Loading: avoid overload, shock load, and unbalanced lifts; keep sling angles above 30°.
- Cover integrity: the woven cover is your early-warning system — if it’s cut or worn through to the core yarns, retire the sling.
- Heat, chemicals, UV: follow the tag’s limits; store dry and out of sunlight.
- Inspect before every use; remove from service for core exposure, heat/chemical damage, or a missing/unreadable tag.
Sling protection is required
“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
Even with a tough cover, a sharp edge can cut to the core. Browse sling protection or choose a cut-resistant round sling.
Standards & design factor
Our polyester round slings are rated to a 5:1 design factor and made to WSTDA recommended standards; use and inspection follow ASME B30.9 and OSHA 1910.184. Proof-test certificates and material test reports are available on request.
Round sling FAQs
Does the color tell me the capacity? It tells you the capacity class. Confirm the exact WLL on the tag/product page.
Why choose Extreema over polyester? HMPE gives far more capacity per pound, floats on water, and resists cuts and chemicals — ideal for offshore, marine, and weight-critical lifts.
Round or web for a choker? Round slings generally grip and cinch better in a choker; web slings give a flatter, more stable bearing surface.
How much do round slings stretch? Polyester round slings stretch about 3–5% at rated capacity — less than nylon web slings.
When should I replace a round sling? When the cover is cut or worn through to the core, or on any heat/chemical damage or missing tag.
Complete lifting solutions
Beyond round slings we stock web slings, wire rope slings, and chain slings — plus the shackles, hooks, and hardware to rig them. Talk to a rigging specialist and we’ll spec the right sling without the guesswork.
Narrow your search
