Safety wire
1/6/2011
Safety wire or lockwire is common in the aircraft and racing industries as an extra precaution to keep vital fasteners from unintentionally loosening and parts from falling off due to vibration or other forces. The use of safety wire is a type of positive locking device. It also allows rapid and easy visual inspection of fasteners to ensure that they have been tightened. Safety wiring of fasteners is often a requirement to pass technical safety inspections in motorsport racing. Safety wire itself is available in multiple gauges and different materials, depending on the application. In consumer aircraft and racing applications, stainless seel wire is used, most commonly in .032" diameter, although other gauges are used for specific circumstances. Typically, safety wire is threaded through a hole drilled into a fastener or part, then twisted and anchored to a second fastener or part, then twisted again, usually with the aid of safety wire pliers. Application PrincipleThere are a few techniques for different applications. Non-proprietary safety wire systems all work on the same principle, which is that the tension of the wire on the fastener prevents it from working itself loose due to vibration or other forces. The wire itself maintains tension and remains in place by being twisted around itself and attached to the fastener to be secured on one end nd an anchor point (which could be another fastener) on the other end. Since safety wire is made of a malleable alloy, it retains its shape after being bent, rather than springing back to its original shape. This property allows it to remain locked around an object, such as when it is passed through a small hole on a fastener, looped back upon itself, and then twisted. The same process is then repeated around the anchor point, which could be another fastener. Since it remains twisted instead of unraveling, it acts as a fixed loop and will not back out without considerable force (greater than the stresses which it is intended to counter) being applied. Mousing
A moused shackleMousing (pronounced mouzing) is the application of safety wire, called mousing wire in this use, to secure a threaded clevis pin to a shackle. This is done by passing a couple of turns of mousing wire through the hole provided for this purpose in the unthreaded end of the clevis pin and around the body of the shackle's hoop. Alternatively, some threaded shackles are provided with a hole through the threaded end of the pin beyond where it emerges from the threaded hole. A cotter pin or a couple of loops of mousing wire through this hole serves the same purpose and secures the shackle in a closed position. Nylon zip-ties are also commonly used in applications where the shackle must be secured, but easy removal is required.
If you want to know more please chect:Galvanized Wire
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