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.

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 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 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, 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 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 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 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 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 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 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.

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.

Step 1: Identify Sling Type

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
   
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.