Details

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Wire rope is often used in slings because of its strength, durability, abrasion resistance and ability to conform to the shape of the loads on which it is used. In addition, wire rope slings are able to lift hot materials.

Wire rope used in slings can be made of ropes with either Independent Wire Rope Core (IWRC) or a fiber-core. It should be noted that a sling manufactured with a fiber-core is usually more flexible but is less resistant to environmental damage. Conversely, a core that is made of a wire rope strand tends to have greater strength and is more resistant to heat damage.

ew slings are marked by the manufacture to show:

The rated load for the types of hitches, and the angle upon which they are based,
The diameter or size, and
The name or trademark of the manufacturer.
Rated loads:

Rated loads (capacities) for single-leg vertical, choker, basket hitches, and two-, three-, and four-leg bridle slings for specific grades of wire rope slings are as shown in Tables 7 through 15.

For angles not shown, use the next lower angle or a qualified person to calculate the rated load. Rated loads are based on:

Material strength,
Design factor,
Type of hitch,
Angle of loading,
Diameter of curvature over which the sling is used (D/d) (see Fig. 4), and
Fabrication efficiency.