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Stren-Flex Lifting Slings, Strength and Flexibility In Lifting

Stren-Flex® Synthetic Round Slings, Synthetic Web Slings, Cargo Strap Tiedowns,Chain Slings, and Lifting Slings
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Stren-Flex® Synthetic Slings

Stren-Flex® Synthetic Web Slings Stren-Flex® Synthetic Polyester Roundslings Synthetic Boat Slings
Synthetic Web Slings Synthetic Round Slings Synthetic Boat Slings

Synthetic Sling Tips

Synthetic Sling Materials

Synthetic Sling Types

Load Factors

Ordering Synthetic Slings

Synthetic Sling Materials

Synthetic slings are made of nylon and polyester to suit various applications. When choosing a material, STREN-FLEX® recommends considering a material’s resistance to specifi c chemicals, temperature, and stretch factor. STREN-FLEX® recommends nylon web slings for most web sling applications, and polyester roundslings are useful in applications requiring low stretch and acid resistant materials. All standard STREN-FLEX® slings are sewn using nylon webbing unless polyester webbing is specifi ed by the customer.

Comparison Chart
Material Use Max. Temperature Stretch Factor
Rated Load
Cost Chemical Safe Use
Most Acids Alcohol Aldehydes Strong Alkalines Bleeching Agents Dry Solvents Ethers Halogenated Hydrocarbons Hydrocarbons Ketones Oil Crude Oil Lubricating Soaps/Detergents Water, Seawater Weak Alkalines
Nylon Most 194° F 10% Same NO OK OK OK NO OK OK OK OK OK OK OK OK OK OK
Polyester Least 194° F 3% Same * OK NO ** OK OK NO OK OK OK OK OK OK OK OK
* Disintegrated by concentrated sulphuric acid
** Degraded by strong alkalies at elevated temperatures

Sling Types

Synthetic web slings come in a variety of different types in order to better serve a particular purpose. Multiple sling configurations allow a user to find a sling that is most adaptable to the application for which the sling is used. Stren-Flex® follows a standard numbering system and terminology, and our representatives can help you find the right sling configurations to fit your needs.

Type 1 Triangle-Choker

Type 1 Synthetic Sling, Triangle-Choker
Type 1 is a versatile sling type that has steel end fittings to allow the sling to be easily used in basket or choker configuration. These fittings also reduce wear and allow easier connection to most hoist hooks. Basket capacities from 4800 to 67,000 pounds. Web widths are from 2-12 inches.

Type 2 Triangle-Triangle

Type 2 Synthetic Sling, Triangle-Triangle
Type 2 slings are the same as Type 1 except each end has the identical triangle. This sling is used only on vertical and basket configurations. Basket rated capacities are identical to Type 1 above.

Type 3 Eye & Eye Flat

Type 3 Synthetic Sling, Eye & Eye
Type 3, also known as eye & eye flat slings, are very popular slings which are stocked in multiple capacities. Eye & Eye slings are very adaptable and are a good choice in many lifting situations. The flat eye is usually easier to remove or insert into limited spaces. Basket capacities from 2400 to 132,000 pounds and web widths from 1-12 inches are available.

Type 4 Eye & Eye Twist

Type 4 Synthetic Sling, Eye & Eye Twist
Type 4 eye & eye twist slings are identical to the Type 3 slings except the eye of a Type 4 is twisted to stand open. Eye and Eye twist slings are recommended if the sling is to be used in a choker hitch. Basket capacities and web widths correspond with Type 3.

Type 5 Endless

Type 5 Synthetic Sling, Endless
Type 4 endless slings are versatile and used for general purposes. The slings can be rigged in an unlimited amount of ways, and they can be readily adjusted to compensate for wear. Endless slings are popular and easy to use. Basket capacities from 4800 to 107,400 pounds and web widths from 1 to 12 inches are available.

Type 6 Reverse Eye

Type 6 Synthetic Sling, Reverse Eye
Type 6 reverse eye slings are heavy duty slings that have an eye and body covered with wear pads. Eyes stand open at 90° to the sling body allowing easy choker or basket hitches. Stren-Flex® manufactures Type 6 slings with basket capacities ranging from 7200 to 70,000 pounds and web widths which vary from 2 through 6 inches.

Type 7 Flat Eye

Type 7 Synthetic Sling, Flat Eye
Type 7 slings are a variation of Type 6 slings with a flat eye in comparison to the reverse eye of a Type 6 sling.

Type 8 Wide Body Heavy Duty Basket

Type 8 Synthetic Sling, Wide Body Heavy Duty Basket
Type 8 slings are used in basket hitches where a wide heavy duty sling is required for load stability and for proper handling of fragile or finished surfaces. Type 8 slings are for basket hitch only with capacities ranging from 19,200 to 108,000 pounds available in web widths from 6 to 24 inches.

Type 9 Light Duty Cargo Basket

Type 9 Synthetic Sling, Light Duty Cargo Basket
Type 9 cargo slings are used in basket hitches to provide a large surface area for load stability and protection for finished or fragile surfaces.. The eyes of a cargo basket sling are small and can easily accommodate small hoist hooks.

Load Factors

After identifying the material type, the next consideration must be the rated lifting capacity required. Remember that the rated lifting capacity of the sling must often be greater than the weight of the load to be lifted. Because the angle of pull on the leg of a sling varies with the leg angle, forces may be exerted on a sling greater than the user may expect.

To calculate the load on a particular sling leg proceed as follows or use our load calculator:

  1. Take the total weight of the load and divide this by the number of legs supporting the load. For example, assume a 2000 pound load is to be supported by 2 legs of a sling. The above will give a total minimum weight on each leg of the sling of 2000 pounds divided by 2 legs or 1000 pounds.
  2. Determine the load factor by observing the load factor chart. Ex. Assume that the leg angle will be 60°. The load factor for 60° from the load factor chart is 1.154.
  3. Multiply the load factor times the minimum weight to be supported by the leg, i.e. 1000 pounds times 1.154=1154 pounds. The rated sling capacity needed is then 2308 (1154x2) pounds in basket capacity to safely lift the 2000 pound load.

Ordering Synthetic Web Slings

When ordering a synthetic web sling from Stren-Flex® follow the basic guidelines that follow. Identifying sling type, number of body plys, grade of webbing, web width, pull-to-pull sling width, and sling material is essential in order to receive the correct sling that is required. The sample part number below is a proper example of an Eye & Eye type sling with two body plys, heavy duty web, 2 in. web width, 3 ft. long sling from pull-to-pull, and Type 4 twisted eye made of nylon material.

Stren-Flex® Synthetic Sling Ordering Tips

Step 1: Identify Sling Type

Type Code Type Description
TC Type 1 Triangle – Choker
TT Type 2 Triangle – Triangle
EEF Type 3 Eye & Eye, Flat
EET Type 4 Eye & Eye, Twist
EN Type 5 Endless
RE Type 6 Reverse Eye
FE Type 7 Flat Eye
WB Type 8 Wide Body
LB Type 9 Cargo Basket
SR   Endless Roundsling

Step 2: Specify the Following

  1. Number of Body Plys (1-4)
  2. Grade of Webbing
    - 9 (9800 psi - Heavy Duty)
    - 7 (7000 psi - Light Duty)
  3. Width of Webbing
  4. Sling Length
    - Measure Pull to Pull
    Synthetic Slings Measure Length Pull to Pull
  5. Sling Material
    - Nylon or Polyester
    - Regular or Monster Edge


CAUTION: These tips are provided as a starting point in the selection process and are not universally applicable. Please consult our experts for the solution to your specific application problem.

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