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When
you’re calculating the load of basket hitches and bridles,
remember that as the horizontal angle of a sling decreases,
the resultant load on each leg increases.The horizontal
angle of bridles with three or more legs is measured the
same way as horizontal sling angles of twolegged hitches.
If a bridle is designed with different leg lengths, it may
result in different horizontal angles. The load on each leg
must be calculated based on the position of the slings and
the location of the lift’s center of gravity.
Adjusting the rated capacity of a choker hitch.
Due to
the body of the sling being used in the choke, there is a
reduction in rated capacity. This is reflected in the choker
rated capacity tables. Another reduction that must be
considered is due to the “angle” of the choke (not the angle
of the leg of the sling)
If
the load is hanging free, the normal choke angle is
approximately 135
degrees. When lifting and turning a load using a choker
hitch, it is not uncommon to have a severe bend at the
choke. When a choker hitch is used at an angle of less than
120 degrees, you must reduce the hitch’s rated capacity as
shown in the chart below. You always must adjust the rated
capacity of the wire rope sling whenever you use a choker
hitch to shift, turn or control a load, or when the pull is
against the choke in a multileg lift.
Warning:
Choker hitches at angles
greater than 135 degrees are not recommended since they are
unstable. Extreme care should be taken to determine the
angle of choke as accurately as possible

Wire Rope Working Load Limits
Numerical values published for Breaking Strength and Working
Load Limit here are very specific in one point: They refer
to straight, inline pull or force and are obtained under
laboratory conditions. There are, however, many applications
where a straight line pull is not possible or even
desirable. When a tackle block system is reeved, wire rope
may be bent over many sheaves; multiple leg wire rope or
chain slings involve differing lifting angles; angular loads
on shackles or eyebolts alter Working Load Limits of the
equipment used. All these and other factors influencing the
Working Load Limit must be taken into account when systems
are designed and used.
The
following is an example intended to demonstrate the effects
of angles on the Working Load Limit.
Effects of Angles on Sling Capacities
The
rated capacity of a multiple leg sling is directly affected
by the angle of the sling leg with the load. As this angle
decreases, the stress on each leg increases with the same
load. If the sling angle is known, the capacity can be
readily determined by multiplying the sling’s vertical
capacity by the appropriate load angle factor from the table
below.
USING LIFTING EYEBOLTS
If a
load is applied at an angle, only shoulder nut eyebolts must
be used. The Working Load Limits as shown in the tables
refer to straightline pull only.
Angular
loads on shoulder nut eyebolts reduce the Working Load Limit
The
following table shows reduced Working Load Limit for hot
galvanized shoulder nut eyebolts using 45° or 90° angles as
an example.
