3 Factors to Consider When Choosing Lifting Slings
Choosing the right lifting sling comes down to three main factors: the weight and delicacy of your load, its center of gravity, and whether it has sharp or abrasive edges. Get all three right, and you'll pick a sling that protects both your load and the people working around it. Learn more about which type of sling best suits your load and environment below.
1. Know The Weight, Strength, and Delicacy of the Load
Before you pick a sling, know two things about your load: how much it weighs, and how much handling it can take before getting damaged.
Match the load's weight to the sling's working load limit (WLL). The WLL is the maximum weight a sling is rated to safely lift, and it's typically one-fifth of the sling's breaking strength (a 5:1 safety factor), which builds in a margin for shock loading, uneven force, or other unpredictable lifting conditions. Confirm this on the manufacturer's tag before every job. For a deeper look at these numbers, check out Working Load Limit, Breaking Strength, and Safety Factor.
Delicacy matters just as much as weight. A sling that's strong enough to lift a load can still damage it if the sling is the wrong material. For heavy, rugged loads made of unfinished hard metals, chain slings are the standard choice. For anything with a polished, painted, or delicate surface, a synthetic sling can better protect the object itself.
2. Identify the Load's Center of Gravity and Match Sling Flexibility
Every load has a center of gravity, or the point where the load's weight is balanced. Miss it, and the load can tilt, swing, or shift unexpectedly, putting stress on the sling and risking injury to those nearby.
For irregularly shaped loads, a flexible sling that conforms to the object allows for a more stable, predictable lift than a rigid one. Nylon slings are a strong choice. Their stretch and flexibilty help them mold to the load's shape.
3. Check If the Load is Sharp or Abrasive
This is where the most sling failures happen. A sling can get get even if it doesn't touch anything obviously sharp. Rough welds, machined edges, corners, and abrasive surfaces all wear down sling material. And repeated small abrasions add up faster than you'd expect.
If you're lifting objects with sharp edges, we traditionally recommend using chain slings or wire rope slings. HMPE (High Modulus Polyethylene) fiber slings, the material behind Sentry Lift slings, are synthetic webbing built to resist cutting and abrasion, offering up to 24 times more abrasion resistance than standard synthetic webbing. That makes it another option for abrasive loads without the added weight of steel.
We carry corner protectors and other sling protection accessories for exactly this purpose.
Comparing Your Sling Options
| Sling Type | Best For | Abrasion/Cut Resistance | Weight | Heat Tolerance |
|---|---|---|---|---|
| Nylon | Delicate, irregularly shaped loads | Low | Light | Up to 194°F |
| Polyester | Loads needing minimal stretch | Low–Moderate | Light | Up to 194°F |
| Sentry Lift® (HMPE) | Sharp/abrasive loads needing a lighter alternative to steel | High | Light | Up to 140°F |
| Wire Rope | Heavy-duty, abrasive, high-heat environments | High | Heavy | High |
| Chain | Heaviest, hottest, most rugged jobs | Highest | Heaviest | Up to 400°F |
A Quick Look at Sling Options:
Nylon Lifting Slings perform best for lifting breakable, delicate objects. Their stretch and flexibility molds them to the shape of the load, and they're lightweight and easy to handle. They shouldn't be used in rugged or abrasive conditions. Read more in Nylon Lifting Slings 101.
Polyester Round Slings offer similar flexibility to nylon with less stretch, making them a better option when elongation is a concern. Read more in Polyester Round Slings 101.
Sentry Lift® HMPE Slings are built from HMPE fiber webbing engineered to resist cutting and abrasion far beyond standard synthetic webbing, without giving up the lighter weight and easier handling that make synthetic slings practical on the job. Available in Endless and Eye & Eye configurations.
Wire Rope Slings are more durable than synthetic slings and more cost-effective than chain. Their construction offers strong abrasion and heat resistance, making them a solid middle ground for rugged jobs.
Chain Slings are the strongest and most durable option, built for the heaviest loads and highest temperatures (up to 400F). We carry domestic, Gunnebo, KWB, and Pewag chain slings in Grade 100 and Grade 120.
Frequently Asked Questions About Lifting Slings
What's the best sling for lifting objects with sharp edges?
Chain and wire rope slings have traditionally been the go-to answer, and they're still the right call for extreme heat or continuous heavy abrasion. For jobs where you want cut and abrasion resistance without the weight of steel, HMPE synthetic slings like Sentry Lift® are also built for this now.
Can a synthetic sling handle abrasive loads?
Standard nylon and polyester webbing isn't built for repeated contact with sharp or abrasive surfaces. HMPE webbing is a synthetic fiber specifically engineered to resist cutting and abrasion, offering meaningfully better performance in this area than standard synthetic slings.
Do HMPE slings still need edge protection?
Yes. Per ASME B30.9, any sling in contact with sharp edges, corners, or abrasive surfaces should be protected. HMPE's built-in resistance reduces wear, but it doesn't eliminate the need for corner protectors or wear pads on genuinely sharp contact points.
Why would I choose a heavier chain or wire rope sling over a lighter synthetic one?
Chain and wire rope still win out in continuous extreme heat, the harshest abrasive environments, and situations where a synthetic sling's temperature limits (194°F for standard nylon/polyester, 140°F for Sentry Lift® HMPE) would be exceeded.
What's the difference between HMPE web slings and HMPE round slings?
Both use HMPE fiber for the same cut and abrasion resistance benefits. Sentry Lift® is a flat web sling, available in Endless and Eye & Eye configurations, while HMPE round slings use a continuous-loop core design.
Tackle the Toughest Lifting Jobs with High-Quality Rigging Hardware
We know the importance of quality when it comes to rigging supplies. We carry a variety of rigging hardware, as well as lifting beams and spreader bars that are designed to lift heavy loads safely and efficiently.
We also do custom orders! Need a custom lifting sling? We can do that! We can customize a lifting sling to meet your specific needs.
