Table A) illustrates the percentage of decrease to be expected. If the object is smaller than the listed 25:1 D/d ratio the capacity (or WLL) must be decreased. When a sling is used in a BASKET- or CHOKER HITCH with D/d ratios smaller than listed in the capacity tables, the rated capacities (or WLLs) must be decreased.įor example: The BASKET and CHOKER hitch capacities listed (in all Standards and Regulations) for 6-strand ropes are based on a minimum D/d ratio of 25:1.Īn object you place into a 1' diameter 6-strand wire rope sling using a basket- or choker hitch must have a minimum diameter of 25'. The object (a shackle, a crane hook, a steel bar, etc.) you place into the sling eye must not be larger than 1/2 of the sling eye length.

On the other hand, do not place too LARGE an object into the sling eye as this will result in splitting forces affecting the sling splice and sling safety. In most cases the shackle or hook over which the sling is placed will have a sufficient D/d ratio. For this reason the D/d ratio in the LOOP is just half as critical as opposed to when the sling is used in BASKET hitch. The LOOP of an eye & eye sling has nearly DOUBLE the strength of its body. This curve is based on static loads and applies to 6-strand class 6×19 and 6×37 wire rope. This curve relates the efficiency of a rope diameter to different D/d ratios.

As the D/d ratio becomes smaller this loss of strength becomes greater and the rope becomes less efficient. When a wire rope is bent around any sheave or other object there is a loss of strength due to this bending action. This ratio has an effect on the rated capacity of slings. The D/d Ratio is the ratio of the diameter around which the sling is bent, divided by the body diameter of the sling.Įxample: A 1/2' diameter wire rope is bent around a 10' diameter pipe the D/d Ratio is 10' divided by 1/2' = D/d Ratio of 20:1

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