two methods of safetying turnbuckles have been
adopted as standard procedures by the armed services:
The clip-locking method of safetying uses an NAS
the clip-locking (preferred) method and the
lock clip. To safety the turnbuckle, align the slot in the
wire-wrapping method (fig. 3-48).
barrel with the slot in the cable terminal. Hold the lock
Lock clips must be examined after assembly for
clip between the thumb and forefinger at the end loop.
proper engagement of the hook lip in the turnbuckle
Insert the straight end of the clip into the aperture
barrel hole by the application of slight pressure in the
formed by the aligned slots. Bring the hook end of the
disengaging direction. Lock clips must not be reused,
lock clip over the hole in the center of the turnbuckle
as removal of the clips from the installed position will
barrel and seat the hook loop into the hole. Application
severely damage them.
of pressure to the hook shoulder at the hole will engage
the hook lip in the turnbuckle barrel and complete the
safety locking of one end. The above steps are then
repeated on the opposite end of the turnbuckle barrel.
Both locking clips may be inserted in the same
turnbuckle barrel hole, or they may be inserted in
First, two safety wires are passed through the hole
in the center of the turnbuckle barrel. The ends of the
wires are bent 90 degrees toward the ends of the
turnbuckle, as shown in figure 3-48.
Next, the ends of the wires are passed through the
holes in the turnbuckle eye or between the jaws of the
turnbuckle fork, as applicable. The wires are then bent
toward the center of the turnbuckle, and each one
wrapped four times around the shank. This secures the
wires in place.
When a swaged turnbuckle terminal is being
safetied, one wire must be passed through the hole
provided for this purpose in the terminal. It is then
looped over the free end of the other wire, and both ends
wrapped around the shank.
What is the purpose of a cotter pin?
How many different methods are used to
secure a turnbuckle?
How many pieces of safety wire are used to
secure a turnbuckle using the wire-wrapping
Figure 3-48.--Safetying turnbuckles: (A) Clip-locking method
(preferred); (B) wire-wrapped method.