• Store and handle shackles correctly.
shackles before use and before placing into storage.
• Select the
correct pattern of shackle and pin for the application.
• Allow for
the full resultant imposed load.
• Fully tighten the pin.
the load acts through the centre line of the shackle using spacers if
necessary to meet this requirement.
• Use shackles with
bent pins or deformed bodies.
• Force, hammer or wedge shackles into
• Eccentrically load shackles.
• Replace the pin with a
• Fit pins in contact with moving parts which may loosen or
• Shock load shackles.
Selecting the Correct
Shackles are available in a range of material grades, sizes
and designs. Select the shackle to be used and plan the lift taking the
following into account:
Type of shackle to be used - dee or bow,
British Standard or other design.
Type of pin - screwed with collar
and eye are suitable for general purposes; with countersunk head for
where clearance is limited; bolt and nut for where the pin may be out of
sight or subject to movement.
Full resultant imposed load - when
using shackles with multi-leg slings remember that as the included angle
increases and so does the load in the leg and any attachment to the leg.
When used to suspend pulley blocks account must be taken of the imposed
load due to operating effort.
BS and ISO Standard
shackles are designed and rated for the pin to accept a central point
load. Other, commonly available, types are designed and rated for the
load to be evenly distributed over the full width of the pin. Unless the
basis for rating is clearly stated it should be assumed that the jaw
must be fully filled and the load evenly spread across the shackle pin
Storing and Handling Shackles
Never return damaged
shackles to storage. They should be dry,clean and protected from
Do not alter, modify or repair shackles and never replace
missing pins with unidentified pins, bolts etc, but refer such matters
to a Competent Person.
Never galvanise or subject a shackle to other
plating processes without the approval of the supplier.
Do not attempt lifting operations unless you
understand the use of the equipment, the slinging procedures and the
mode factors to be applied.
Do not use defective shackles or
Shackles should be fitted so that the body takes
the load along its centre line and is not subjected to side bending
loads. When connecting a number of sling legs, and similar applications,
position them so that they do not impose a side load on the shackle
jaws. Use spacers to position them if necessary.
Ensure the pin is
correctly screwed into the shackle eye.
Tighten by hand, use a small
bar to lock the collar to the shackle eye. Check that the thread is
fully engaged with the body but is not too long so that tightening
causes the body to deform.
With bolt and nut pins ensure the nut jams
on the inner end of the thread and not on the eye of the shackle. The
bolt should be free to rotate with minimal side float. The split cotter
pin must be fitted before making a lift.
When using shackles with
slings in choke hitch, or in other applications where there may be
movement, place the pin through the eye or link of the sling and never
in contact with the bight of the choke or moving parts which may cause
the pin to unscrew.
In-service Inspection and Maintenance
Maintenance requirements are minimal. Keep shackles clean, the threads
free of debris and protect from corrosion.
Regularly inspect shackles
and, in the event of the following defects, refer the shackle to a
Competent Person for thorough examination: illegible markings;
distorted, worn, stretched or bent body; bent pin; damaged or incomplete
thread forms;nicks, gouges, cracks or corrosion; incorrect pin; any