Alloy steel chains are often used because of their strength, durability, abrasion resistance and ability to conform to the shape of the loads on which they are used. In addition, these slings are able to lift hot materials.
Alloy steel chain slings are made from various grades of alloy, but the most common grades in use are grades 80 and 100. These chains are manufactured and tested in accordance with ASTM guidelines. If other grades of chain are used, use them in accordance with the manufacturer's recommendations and guidance.
New slings are marked by the manufacture to show:
In addition, slings may be marked to show:
Rated loads (capacities) for single-, double-, triple- and quadruple-leg slings and single- and double-basket slings used in vertical, bridle, or basket hitches are given in the horizontal angles.
For angles not shown, use the next lower angle or have a qualified person calculate the rated load for the new angle. Rated loads are based on:
Do not use horizontal angles less than 30 degrees except as recommended by the sling manufacturer or a qualified person.
Rated loads for single-, double-, triple-, and quadruple-leg slings used in a choker hitch are given in this article, for the horizontal angles listed provided that the angle of choke is greater than 120 degrees For angles of choke less than 120 degrees, use the rated loads provided by the sling manufacturer or a qualified person.