Double-Choker Hitch (fig. 3-27): For sling
angle of 45 degrees or more, SWL = SWL (of
single-vertical hitch) x 3 divided by 4 x H
divided by L x 2.
Sling angles of less than 45 degrees, SWL =
SWL (of single-vertical hitch) x A divided by
B x H divided by L x 2.
Most of the attachments used with wire rope
are designed to provide an eye on the end of the wire
rope by which the maximum strength of the wire rope
can be obtained when the wire rope is connected to a
load. With the exception of some slings, all spiced
eyes should incorporate rope thimbles to maintain
rope strength and reduce wear. If a thimble is not
used, the efficiency of the connection can be reduced
by as much as 10 percent because the rope flattens
under the load (fig. 3-28).
Figure 3-28.-Wire rope thimble.
Every wire rope manufacturer attaches a different
name to its particular type of eye splice; however, there are
Figure 3-27.Determination of double-choker hitch sling capacity.