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Lock Wire Procedure Detail
Wire ties are frequently used as a locking device for bolted
connections to prevent loosening due to vibration and loading
conditions, or tampering. The use of safety wire ties is
illustrated below. The illustrations assume the use of right -hand
threaded fasteners and the following additional rules apply:
1) No more than three (3) bolts may be tied together.
2) Bolt heads may be tied as shown only when the female thread
receiver is captive.
3) Pre-drilled nuts may be tied in a fashion similar to that
illustrated with the following conditions a) Nuts must be
heat-treated; and b) Nuts are factory drilled for use with
lock wire.
4) Lock wire must fill a minimum of 75% of the drilled hole provided
for the use of lock wire.
5) Lock wire must be aircraft quality stainless steel of .020
diameter, .032 inch diameter, or .042 inch diameter. Diameter of
lock wire is determined by the thread size of the fastener to be
safe-tied. a) Thread sizes of .250 inch and smaller use .020
inch wire; b) Thread sizes of .250 inch to .500 inch use .032
inch wire; c) Thread sizes over .500 inch use .042 inch wire;
and d) The larger wire may be used in smaller bolts in cases
of convenience, but smaller wire must not be used in larger fastener
sizes.
 
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