Figure 6-18.Determination of single-basket hitch sting
bulge on the side or end of the link. Chain size refers
to the diameter, in inches, of the wire used to fabricate
In the NCF, never use a chain when it is possible
to use wire rope. Chain does not give any warning
that it is about to fail. Wire rope, on the other hand,
fails a strand at a time, giving you warning before
failure actually occurs.
NOTE: Although chain gives no warning of
failure, it is better suited than wire rope for some jobs.
Chain is more resistant to abrasion, corrosion, and
heat. Additionally, use chains to lift heavy objects with
sharp edges that could cut wire or are hot. When chain
is used as a sling, it has little flexibility but grips the
First, you must be aware that chains normally
stretch under excessive loading and individual links
will be bent slightly. Therefore, bent links are a
warning that the chain has been overloaded and may
fail suddenly under load. Before lifting with a chain,
make sure the chain is free from twists and kinks. A
twisted or kinked chain placed under stress could fail
even when handling a light load. Additionally, ensure
that the load is properly seated in the hook (not on the
point) and that the chain is free from nicks or other
damage. Avoid sudden jerks in lifting and lowering the
load, and always consider the angle of lift with a sling
The strength of any chain is negatively affected
when it has been knotted, overloaded, or heated to
temperatures above 500°F.
Figure 6-19.Determination of double-basket hitch sling capacity.